Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
Standard, UL Recognized and
Military Qualified Solder Lug Styles
Note:
Rear Views
Series 44
Series 42
DIMENSIONS
No. Dimension B Approx. Weight No. Dimension B Approx. Weight
of Dimension Style Style Grams of Dimension Style Style Grams
Decks A A M or H 42 44 Decks A A M or H 42 44
Dimension C D E F
C
L
C
L
SERIES 42, 43, 44 and 54
1" Diameter, 1 Amp, Standard,
Military SR04
FEATURES
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
CIRCUIT DIAGRAMS: Solder Lug Terminals
Switch is Viewed From Shaft End and Shown in Position No. 1
Rear Views
Series 44
60° Angle
of Throw
Series 42 & 43
36° Angle
of Throw
Series 44
45° Angle
of Throw
Series 44
90° Angle
of Throw
Series 44 & 54
30° Angle
of Throw
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
Recommended Panel Cutout
For all 42/43/44/54 Series
Non-Sealed Version
(Except 42P Style)
For all 42/43/44/54 Series
Sealed Version
(Including 42P Style)
I
I
I
'
I
I
MIL-DTL-3786/4L
G
-
�o
DIA
FOR USE ON SEALED SWITCHES
FOR USE WITH NON-TURN DEVICES
NOTES:
1. Dimensions are in inches.
2. Metric equivalents are given for general information only.
3. Unless otherwise specified, tolerances are ±.003 (0.08 mm) on diameters, ±.005 (0.13 mm)
on all other dimensions, and ±2° on angles.
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
These switches have no bushing keyway.
Equivalent Styles
For style 42A36, use 42D36,
For style 44A30, use 44D30
For style 42M36, use 42D36 initially
ADJUSTABLE STOP SWITCHES: Series 42 and 44
Front Views
Switch is Viewed From Shaft End
and Shown in Position No. 1
PC BOARD MOUNTING PATTERN
Termination
CIRCUIT DIAGRAM: PC Mount
Standard Style
DIMENSIONS
C
L
1.000 ± .010
(25,4 ± 0,25)
DIA.
TERMINAL DIMENSIONS AT THIS
POINT ARE .050 ± .005 (1,27 ± 0,13)
WIDE BY .020 ± .003 (0,51 ± 0,08) THICK
.375 ± .015
(9,53 ± 0,38) TYP.
.750 ± .010
(19,05 ± 0,25)
TYP.
OF BUSHING
KEYWAY
C
L
.250 + .001 –.002
(6,35 + 0,03 –0,05)
DIA.
3/8-32 UNEF-2A THREAD
(MTG. HOLE=3/8 DIA. MIN.)
BUSHING KEYWAY
.066 ± .002 (1,68 ± 0,05) WIDE BY
.036 ± .003 (0,91 ± 0,08) DEEP
FROM A .375 (9,53) DIA.
INTEGRAL ASSEMBLY NUT,
DO NOT REMOVE
COMMON LUG
.250 ± .020
(6,35 ± 0,51)
.830
± .010
(21,08
± 0,25)
DIM. A + .046 – .020
(+1,17 –0,00)
.437 ± .020
(11,10 ± 0,51)
.600 ± .031
(15,24 ± 0,79)
DIM. B REF.
STUD
PROJECTION
#1 THREAD
.174
± .010
(4,42
± 0,25)
C
LC
LC
L
.174 ± .010
(4,42 ± 0,25)
.786 ± .010
(19,96 ± 0,25)
DIA.
.500 ± .015
(12,7 ± 0,38)
TYP.
1.470 ± .020
(37,34 ± 0,51)
TYP.
.735 ± .010
(18,67 ± 0,25) TYP.
.187 ± .015
(4,75 ± 0,38) TYP.
.250 ± .015
(6,35 ± 0,38) TYP.
1
10
6
5
4
3
2
9
8
7
GRAYHILL
.219
± .005
(5,56
± 0,13)
SERIES 42
1" Diameter, 1 Amp, PC Mount
C
L
C
L
C
L
C
L
SHAFT AND PANEL SEAL: Srs. 42 & 44
Standard Style
FEATURES
For style 44M30, use 44D30 initially
For style 42U36, use 42UD36
For style 44U30, use 44UD30
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
Standard Style and Military Qualified
DIMENSIONS
Note:
Rear Views
Series 54
Series 43
Number of Approx. Weight
Decks Dimension A Dimension B Grams
Section Section Style Style Style Series Series
“A” “B” A, M or H A M or H 43 54
C
L
C
L
SERIES 43
SERIES 54
1" Diameter, 1 Amp, Concentric
Shafts
FEATURES
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
SERIES 43 and 54
1" Diameter, 1 Amp, Add-A-Pot
FEATURES
Standard Style
Series 43
Note:
Number
of Dimension
Decks A Series 43 Series 54
Approx. Weight
Grams
Series 54
DIMENSIONS
Rear Views
Series 54
Series 43
C
L
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
SERIES 54
1" Diameter, 1 Amp, Add-A-Pot
FEATURES
Military Qualified Style
Note:
Number Approximate
of Dimension Weight
Decks A Grams
DIMENSIONS
Potentiometer Mounting
Mounting Plate A Mounting Plate B
C
L
1.265
(32,13)
DIA.
27.5
± 2
.098 ± .003
(2,49 ± 0,08) DIA. (3)
THROUGH BOLT
HOLE (2 EA.)
15
± 2
.245 ± .003
(6,22 ± 0,08) R.
.375 ± .003
(9,53 ± 0,08) R.
.261 ± .003
(6,63 ± 0,08) DIA. (1)
1.265
(32,13)
DIA.
15 ± 2
9
± 2
.437 ± .003
(11,10 ± 0,08) R.
.531 ± .003
(13,49 ± 0,08) R.
.380 ± .003
(9,65 ± 0,08)
DIA. (1)
.130 ± .003
(3,30 ± 0,08)
DIA. (2)
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
MILITARY QUALIFIED
Single Shaft Switches
Two Switches, Concentric Shafts
Add-A-Pot Switches
All Qualified Switches
MILITARY QUALIFIED SHAFT AND
PANEL SEAL:
Styles HS, HBS, HGS and HBGS
SPECIFICATIONS:
Electrical Ratings
Standard Style
Rated:
Angle of Throw
30° or 36° 45° or 60° 90°
Contact Resistance:
Insulation Resistance:
Voltage Breakdown:
Life Expectancy:
Note:
UL Recognition–
Styles UA, UD, UM, UP, US and USP
Electrical Parameters:
Overload:
Endurance:
Temperature Rise:
Note:
Electrical Ratings
Military Style
General Rating:
Voltage and Load:
Contact Resistance:
Insulation Resistance:
Voltage Breakdown:
MIL-S-3786 Electrical Values
Military Style
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
SPECIFICATIONS:
Contact Resistance:
Insulation Resistance:
Dielectric Strength:
Materials and Finishes
Standard Style
Bases:
Cover, Deck Separators, End Plate and Rotor
Mounting Plate:
Mounting Bushings:
Shaft, Cover Plate, Retaining Rings, Through
Bolts, Shaft Extensions, Stop Arm, Thrust
Washers Stop Washers and Rear Support
Plate:
Detent Balls:
Detent Springs:
Rotor Contact, Stator (Base) Contacts:
Terminals (Except Common):
Common Plate, Including Solder Lug:
Mounting Hardware:
Stud Nuts, Mounting Nuts, Lock Washers:
Materials and Finishes
Military Qualified
Bases:
Cover, Deck Separators, End Plate and
Rotor Mounting Plate:
Mounting Bushings:
Shaft, Cover Plate, Retaining Rings,
Through Bolts, Shaft Extensions, Stop Arm,
Stop Washers, Thrust Washers and Rear
Support Plate:
Detent Balls:
Detent Springs:
Rotor Contact:
Terminals, Common Plate including Solder
Lug:
Mounting Hardware:
Stud Nuts, Mounting Nuts, Lock Washers:
Additional Characteristics
Standard Style and Military Qualified
Contact:
Rotational Torque:
Mechanical Life Expectancy:
Shaft Flat Orientation:
Stop Strength:
Extended Stud:
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
CHOICES AND LIMITATIONS: Series 42, 43, 44 and 54
SINGLE SHAFT SWITCHES
Style Choices Angle of Number of Poles Positions Shorting or
Series Unsealed Shaft/Panel Seal Throw Decks Per Deck Per Pole1,3 Non-Shorting
Style Angle of Section A (Front) Section B (Rear)
Series Choices Throw Decks Poles Position N or S Decks Poles Position N or S
CONCENTRIC SHAFT, 2 SWITCHES
54
43
54
43
54
ADD-A-POT SWITCHES
Concentric Shaft Switches
42
44
44
42
42
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Multi-Deck Rotary Switches
ACCESSORIES
Internal Tooth Lockwasher–Figure A
No.
12Q1272-1
Non-Turn Washer–Figure B
Part No. 12C1087-1
Panel Seal Kit–Figure C
ORDERING INFORMATION: Single Shaft Switches, Add-A-Pot Switches
ORDERING INFORMATION: Concentric Shaft Rotary Switches
Series:
Style*:
Number of Decks:
44M30–02–1–12N–F
Stop Arrangement:
Type of Contacts:
Positions Per Pole:
Poles Per Deck:
* All rotary switches that are required to have military designated markings and testing adhering to MIL-3786 are to be ordered by specifying
the military part number identified on the appropriate slash sheet.
Series:
Style*:
Section A (front)
Number of Decks:
Poles Per Deck:
Positions Per Pole:
Type of Contacts:
43M02110N–M03203S
Section B (rear)
The limitations listed for Section A apply to Section B
Type of Contacts
Positions Per Pole
Poles Per Deck
Number of Decks
Style
* All rotary switches that are required to have military designated markings and testing adhering to MIL-3786 are to be ordered by specify-
ing the military part number identified on the appropriate slash sheet.
Available from your local Grayhill Distributor
Non-Turn Washer Seal Keyed Washer Hex Nut
FIGURE C
C
L
FIGURE B
FIGURE A
PartNo. 42-24
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Keylock Rotary Switches
Note: Switch/key positions are not
aligned with terminal positions.
No. of decks 1 2 3 4 5 6
Dim. A (In.) 1.556 1.902 2.248 2.594 2.940 3.536
Dim. B (in.) .062 .062 .062 .062 .062 .312
Dim. A (mm) 39,52 48,31 57,10 65,89 74,68 89,81
Dim. B (mm) 1,57 1,57 1,57 1,57 1,57 7,92
1 2 3 4 5 6
123 120 127 144 151 158
No. of Decks
Approx. Weight
in Grams
RECOMMENDED PANEL CUT
L Standard,SolderLugs 45°
Series 44 Switches
Style Description
CHOICES AND LIMITATIONS
SERIES 44L
High Current, 5 Amp
DIMENSIONS in inches (and millimeters)
Grayhill part number and date code marked on label.
Customer part number marked on request.
1.575 – .015
(40,0 – 0,38)
DIA.
B
C
D
E
F
G
H
1.332 – .002
(33,83 – 0,05)
ACROSS FLATS
SWITCH POSITION 1
(KEY REMOVAL A)
LOCK SWITCH
DIM. A
.283 – .062
(7,19 – 1,57)
DIM. B
1-3/8-32
UNS-2A
THREAD
KNURLEDNUT1.800(45,72)DIA.;
.281(7,14)THICK;PINHOLES
90¡ APART
† 1.950 (49,53) DIA.
LOCKWASHER
1
2
3
4
5
6
7
8
1.170 – .015
(29,72 – 0,38)
OVER TERMINALS
45 15
HOLE DIA.
≥ .064 (1,63)
AFTER
PLATING
.522 – .020
(13,26 – 0,51)
1.335 + .010 – .000
(33,91 + 0,25 – 0,00)
1.375 + .015 – .000
(34,93 + 0,38 – 0,00)
LOCK FEATURES
•8-Pin,RoundKeySecurity
•OptionsforFlatKeys,Special
Keying,andKeyRemovals
SWITCH FEATURES
•High,5AmpCurrentSwitching
•45°,Upto8PolesPerSwitch
•25,000CyclesofOperation
•RoHSCompliant
LOCK SPECIFICATIONS
Keying:Eachlockiskeyeddifferently
Key Removal: Allpositions(45°,etc)
Special Options: Flat key with 90° or 180°
incrementkeyremovals;7thru12decks
.
LOCK MATERIALS AND FINISHES
Bushing and Knurled Spanner Nut: Alumi-
num, black anodized
Keying Washer, Cover Support Plate, Shaft
Extension: 302 Stainless steel
Internal and External Lockwashers: Brass,
tin/zinc-plated or stainless steel.
Keys, Cylindrical: Stainlesssteel;2supplied
Angle of No. Of Poles/ Positions Shorting or
Throw Decks Deck Per Pole Non-Shrtg.
01 to 06 1 02 to 08 N or S
01 to 03 2 02 to 04 N or S
01 or 02 3 01 or 02 N
01 or 02 4 01 or 02 N
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Keylock Rotary Switches
SWITCH SPECIFICATIONS
Electrical Characteristics
Industrial Grade Switch
Switching Current and Life
The load-life values indicate the number of
cyclesofoperationexpectedforthevoltage,
currentandtypeofload.Endoflifeisdened
using the resistance and breakdown failure
criteria listed below.
5Aat 115Vac,resistive
1Aat 6to28Vdc,resistive
2Aat 115Vac,inductive
Cycle of Operation: 360° rotation plus a
360°return
Test Conditions:25°C,68%relativehumidity,
atmospheric pressure
Life Expectancy:
Withloadsabove: 25,000cycles
Without load: 100,000 cycles
Contact Resistance:
Endoflife: lessthan 20 mΩ
Insulation Resistance:
(Between mutually insulated parts)
Initially: 50,000 MΩ
Breakdown Voltage:
(Between mutually insulated parts)
Initially: 1,000 Vac
Endoflife: 500 Vac
Carry Current: 10A; maximum temperature
rise20°C
ORDERING INFORMATION
44 L 45-02-1-08N-F
Series
Style Letter: L
Angle of Throw:45°
Number of Decks: 01 thru 06 (per Choices chart)
Poles per Deck: 1 thru 4 (per Choices chart)
Positions per Pole: 02 thru 08 (per Choices chart)
Type of Contacts:
N = Non-shorting
S = Shorting (per Choices chart)
Stop Arrangement Suffix: (needed only for 1-pole switches
with
maximumpositions)
F=Fixedstopbetweenpositions8and1
*Leaveblankforcontinuousrotation
Available from your local Grayhill Distributor.
For prices and discounts, contact a local
Sales Ofce, an authorized local Distributor or
Grayhill.
Mechanical Characteristics
Switching Mode:
45°,1or2poles:Shortingornon-shorting 45°,
3or4poles:Non-shorting
Type of Contact: Wiping contacts
Contact Force: greater than 150g
Number of Terminals:Switchesareprovided
withonlythenumberofterminalsneeded Stop
Strength: greater than 15 in-lbs (1.70 Nm)
Switching Torque: 8-115 in-ozs (28 to 230
mNm),dependingonthenumberofpoles,
numberofdecks,andangleofthrow
Additional Characteristics
Switchesof6ormoredeckshavelongerstuds
withextramountingnutsforrecommended
double end mount
Materials and Finishes: Switch
Switch Bases: Melamine per MIL–M–14, 4
Switch Bases:
Industrial Grade: Melamine per MIL–M–14
Military: Diallyl per MIL–M–14
Cover, Deck Separators, End Plate, and
Rotor Mounting Plate: Phenolic per
MIL–M–14
Shaft, Shaft Extension, Stop Arm, Stop
Washers, Rear Support Plate, Cover
Plate, Retaining Ring, Studs, Nuts: Stain-
less steel
Detent Balls: Steel, nickel-plated
Detent Springs: Tinned music wire
Rotor Contact, and Stator (Base) Con-
tacts: Silveralloy
Common Plate, and Common Terminal:
Brass, 300µinch,(7.6µm)silverplate
Base Terminals: Brass, tin plated
Operating Temperature Range: -40 °C to +85 °C
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
www.grayhill.com Bulletin 1221
Rev 04/14
Series
71
Features
• Quick Route to Rotary Switches
• For Prototypes and
Small Production Runs
Series
56
Series
50/51
BEST AVAILABILITY
The Problem
Procurement lead time on rotary switches for
prototypes and small production runs can be long.
This is often a source of headache for design
engineers and production control managers.
Grayhill makes more than 300,000 combinations
of rotary switch styles; number of decks, poles
per deck, positions per pole, military qualied
or commercial grade, etc. This wide variety
makes it impractical for either distributors or
manufacturers to stock completed switches.
Consequently, even small quantities must be
built to order.
The Solution
Grayhill Electronic Distributors can supply a wide
variety of rotary switches with Adjustable Stops.
This feature gives you a switch immediately
with exactly the electrical properties you need.
These Adjustable Stop switches have the basic
mechanical characteristics of their xed stop
counterparts. To get the right number of positions
per pole for your application, simply adjust the
stop washers or stop pins.
By stocking a few switches, the Distributor
provides over 100,000 possible combinations of
switches. This includes the popular styles, sizes,
angles of throw, number of decks, poles per
deck, positions per pole, and types of contacts.
Availability of these switches through Distributors
speeds prototype development time. There is no
time lag in waiting for factory made samples.
The Substitution
Writing an equivalent part number is easy. To
obtain an adjustable-stop equivalent to a xed-
stop rotary switch you must substitute style
letters and possibly series number. Then replace
the positions-per-pole number in the xed-stop
number with the letters AJ. See the examples
for the scheme.
When adjustable equivalents apply, the rotary
switch pages will indicate the substitutions.
A chart will show the xed stop rotary switch
series, style and angle of throw as well as
the adjustable stop rotary switch series, style
and angle of throw. Then the letters AJ in the
positions-per-pole location, gives you the part
number of the equivalent.
Suppliers
Distributors can supply 1 and 2-deck adjustable-
stop switches from stock (one or two poles
per deck). They can also quickly secure other
variations from factory stock. Reduce prototype
development time. Use Grayhill Adjustable
Stop Rotary Switches for all of your prototype
requirements.
These electronic distributors also maintain a
representative stock of Grayhill products. Local
availability can often “save the day”, and simplify
your paperwork.
Series
Style
Angle of Throw
No. of Decks
Poles/Deck
Positions/Pole
Type of Contacts
N = Non-Shorting
S = Shorting
Series
Style
Angle of Throw
No. of Decks
Poles/Deck
Positions/Pole
Type of Contacts
N = Non-Shorting
S = Shorting
42A36-01-1-07N 42D36-01-1-AJN
Fixed Stop Rotary Switch Adjustable Stop Equivalent
Series
42/44
Adjustable Stop Rotary Switches
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Special Function Rotary Switches
DIMENSIONS
SPECIFICATIONS
Electrical Ratings
The switching elements, and therefore ratings,
are the same in an isolated position switch as in
a conventional rotary switch. Mechanical life is
also the same.
Additional Characteristics
Shaft Movement or Vertical Travel:
Series 09 .062 ± .020 (1,57 ± 0,51)
Series 42 & 44 .070 ± .020 (1,78 ± 0,51)
Series 50 & 51 .080 ± .020 (2,03 ± 0,51)
Push or Pull Force Required:
Series 09 1.75 ± .5 lbs
Series 42 & 44 2 ± .5 lbs
Series 50 & 51 2 ± .5 lbs
Stops: Single pole per deck switches with the
maximum number of positions are supplied with
stops only on request: 12 positions in 30° throw,
10 in 36°, and 8 in 45°.
Stop Strength: Approximately 7.5 pound-inches
for the isolated position stop.
FEATURES
• Protected Switch Positions For
Safety, Calibration, or Stand-by
• Choice of Push- or Pull-To-Turn
•1/2" Diameter, 200 mA and
1" Diameter, 1 Amp Switch
• 10,000 Cycles of Operation
Series 09 Series 42 & 44
Series 50 & 51
Dimension A
1 Deck 1.371 (34,82)
2 Decks 1.717 (43,61)
3 Decks 2.063 (52,40)
4 Decks 2.409 (61,19)
Dimension A
1 Deck 1.228 (31,19)
2 Decks 1.496 (38,0)
3 Decks 1.764 (44,81)
4 Decks 2.032 (51,61)
Dimension A
Solder Lug .893 ± .025 (22,68 ± 0,64)
PC Style .897 ± .025 (22,78 ± 0,64)
Grayhill part number and date code marked on label.
Customer number marked on request.
DESCRIPTION
An isolated position is one which cannot be reached by the normal rotation. An additional action is
required by the operator. It could be either Push-To-Turn, or Pull-To-Turn. After the switch is rotated
to the isolated position, releasing the shaft locks the switch in that position. Push or pull again to
rotate the switch again.
Use isolated positions to protect a switch position from indiscriminate rotation. Such safety positions
might include “calibrate”, “off” and/or “stand-by”.
EXTERNAL DIFFERENCES
The isolated position mechanism increases the
depth of the Series 50 and 51 by 0.217" (5,51
mm). All other dimensions remain unchanged.
In Series 9, 42 and 44, it has the appearance of
an additional deck section without terminals,
located directly behind the detent system.
Materials and Finishes
Materials and finishes for the isolation
mechanism are listed here.
Series 50 and 51
Housing: Zinc casting, tin/zinc-plated
Shaft: 303 stainless steel
Stop Pin and Stop Post: 303 stainless steel
Spring: Tinned music wire
Series 09
Housing: Phenolic for style A; Diallyl, for M
Shaft: 303 stainless steel, electro-polished
Stop Pin and Stop Post: 303 stainless steel
Spring: Tinned music wire
Series 42 and 44
Housing: Diallyl per MIL-M-14
Shaft: 303 stainless steel
Lock Plate: 302 stainless steel
Lock Arm: 316 stainless steel
Lock Post: Brass, tin/zinc-plated
Compression Spring: Tinned music wire
SERIES 09, 42, 44, 50, 51
Isolated Position
DIM
.
A
+ .
046 (1
,
17)
–.020 (0,51)
.062 (1,57)
DIM. A SOLDER
LUGS
DIM. A PC
TERMINALS
DIM. A + .046 –.020
(+ 0,05 –0,51)
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
CONVENTIONAL NUMBERS
Start by creating a conventional switch number
in the manner which follows:
Series & Style
Angle of Throw
Number of Decks
09A30-01-1-12N
Type of Contacts
Shorting = S
Non-Shorting = N
Positions Per Pole
Poles Per Deck
Note: No stop arrangement suffix is needed.
See Describing Stops.
Special Function Rotary Switches
Standard Military Style Angle Of No. Of Poles Per Positions Shorting Or
Style Style** Description Throw Decks Deck Per Pole Non-Shorting
01 to 04 1 02 to 12 N or S
01 to 04 2 02 to 06 N or S
09A 09M Solder Lug 30° 01 to 04 3 02 to 04 N or S
01 to 04 4 02 or 03 N or S
01 to 04 5 02 N or S
01 to 03 6 02 N or S
42A 42M Solder Lug
42S — Sealed 36° 01 to 04 1 02 to 10 N or S
— 42H 125° Temperature Rating 01 to 04 2 02 to 05 N or S
— 42HS 125° Temp Rating, Sealed
01 to 04 1 02 to 12 N or S
01 to 04 2 02 to 06 N or S
30° 01 to 04 3 02 to 04 N or S
44A 44M Solder Lug 01 to 04 4 02 or 03 N or S
44S — Sealed 01 to 04 5 02 N or S
— 44H 125° Temperature Rating 01 to 04 6 02 N or S
— 44HS 125° Temp Rating, Sealed
45° 01 to 04 1 02 to 08 N or S
01 to 03 2 02 to 04 N or S
01 or 02 3 02 N or S
01 or 02 4 02 N
-- 50C Solder Lug
-- 50CP PC Mount 36° 01 1 02 to 10 N or S
-- 50M* Solder Lug, Sealed 2 02 to 05 N or S
-- 50MP* Sealed, PC
-- 51C Solder Lug 1 02 to 12 N or S
-- 51CP PC Mount 30° 01 2 02 to 06 N or S
-- 51M* Solder Lug, Sealed 3 02 or 03 N or S
-- 51MP* PC Mount, Sealed 4 02 or 03 N or S
*(Pull-to-Turn only) **For specifics on military qualified products, see Standard Switch Pages.
CHOICES AND LIMITATIONS
DESCRIBING STOPS
When a 1-pole switch has less than the maximum
number of positions, consider also the stop
system. Following is the arrangement for a 6
position switch with the position 1 isolated.
STOP 1P2 3 4 5 6 STOP
The word “STOP” indicates the conventional
switch stops, which limit rotation to positions 1
through 6. To isolate position 1 we insert only
one isolation post–between terminals 1 and 2.
The stop system already prevents rotation
beyond terminal 1.
In multi-pole switches, the stop system and
isolation system described for the first pole,
automatically affects the other poles. In the
example above, isolating position #1 on the first
pole isolates the first position (terminal #7) of
the second pole. See Standard Switch Pages
for a 2 pole circuit diagram for a 30° throw
switch.
Let's isolate position 1 and position 2 from all
other positions and from each other. We indicate
isolation posts as shown here:
12P1P2P3 4 5 6 7 8 9 10 11 12
To isolate just position 1, describe like this:
12P1P2 3 4 5 6 7 8 9 10 11 12
To isolate positions 1 and 2 from all other
positions, but not from each other, do this:
12P1 2P3 4 5 6 7 8 9 10 11 12
ORDERING INFORMATION
Indicate this as a SPECIAL switch to ensure
that no error is made when the order is entered.
Sample part number:
SPECIAL
09A30-04-1-12N
PULL 12P1P2P3 4 5 6 7 8 9 10 11 12
This sample part number orders a Series 9
standard style, four deck, one pole per deck,
twelve positions per pole rotary switch with non-
shorting contacts and isolation posts between
positions 12 and 1, between 1 and 2, and
between 2 and 3.
This lengthy order number is required to prevent
any possible confusion in ordering the switch.
When we receive your order, we will assign a
special “short form” part number to facilitate
future identification of this special switch. This
number is sequentially assigned as the need
arises, and is non-descriptive. A typical “short
form” special part number might be 09YY12345.
Contact Grayhill for price.
Not available through Distributors.
DESCRIBING POSITIONS
The Grayhill system for isolating positions lets
you choose the positions to be isolated. Grayhill
inserts isolation posts next to the positions to be
isolated. Consider a continuous rotation switch
of the Series 09A with a 30° angle of throw. The
terminals are listed here from 1 through 12 with
a space between each to indicate where isolation
posts might be inserted.
12123456789101112
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Special Function Rotary Switches
DIMENSIONS
SELECTING A SWITCH
1. Select a Configuration: The total number of
positions always includes the 2 basic positions.
A (4) position switch of DDD
DM
configuration
would have 3 detent positions counterclockwise
of the momentary position.
2. Select Series, Angle of Throw, and Style:
See the Choices Chart. The basic switch
description, series, and throw are as follows:
1/2", 1/4 Amp, multi-deck 08 = 36° 09 = 30°
1", 1 Amp, multi-deck 42 = 36° 44 = 30°
1/2", 200 mA, single deck 50 = 36°
Electrical ratings are the same as those of the
conventional switches with the exception of life.
Life is limited to 10,000 cycles of operation
(25,000 cycles for Series 50) due to the spring
arrangement. Dimensions are the same as for
conventional types except for the shaft flat
orientation of the 3, 4, 5, and 6 pole, Series 09
and 44 in the DDDD
DM
configuration (see
chart).
3. Select Poles & Positions Per Pole: If you
do not find the poles and positions per pole you
need in one series, try another or contact the
factory. If the behind panel length is a problem,
select a multi-pole type instead of a single deck.
FEATURES
• Hold-To-Test, Hold-To-Calibrate,
And Other Momentary Applications
• Choice of Configurations, Ratings,
Styles and Circuitry
• 10,000 Cycles of Operation
Series 42 & 44
Series 50
Equivalent to Series 50 Standard Switches
Series 08 & 09
For all other dimensions and
specifications, see Standard
Switch pages.
No. of Dim Dim
Decks A B
1 .960 (24,38) .062 (1,57)
2 1.228 (31,19) .062 (1,57)
3 1.496 (38,0) .062 (1,57)
4 1.764 (44,81) .062 (1,57)
5 2.032 (51,61) .062 (1,57)
6 2.550 (64,77) .312 (7,92)
For all other dimensions and
specifications, see Standard
Switch pages.
No. of Dim.
Decks A
1 1.025 (26,04)
2 1.371 (34,82)
3 1.717 (43,61)
DESCRIPTION
A spring return rotary switch has 1 or more momentary positions. Maintaining contact at momentary
positions requires rotational force. Releasing the force allows the mechanism to return the contact
to a normal, or detent, position.
CONFIGURATIONS
This configuration indicates a counterclockwise
force is required to hold the switch at position
#1. “M” indicates a momentary position
counterclockwise of “D” and "D", detented ones.
Positions 1 2 3
MDD
Releasing this force breaks contact with position
#1 and returns the switch to #2. Normal rotary
switch detent action occurs when the switch is
rotated between position #2 and #3.
All of the configurations (except
MDM
) list a
basic 2 position arrangement which is shown in
italics. Example:
MD
DDDD or DDDD
DM
. Several
positions can be added during the switch
construction at the factory; but, any configuration
must always contain the 2 basic positions.
OPTIONS
Watertight panel seal; Multi-pole switches that
exceed the limits noted in the Selector Chart;
Series 50
MD
or
DM
configurations in Military
styles; Series 08, 09, & 44 in MM
MDM
MM, and
in MM
DD
MM, and in MMM
MMD
.
Not available through Distributors
ORDERING INFORMATION
Create the part number using this example.
Exception: Numbers beginning with 5 are
already complete part numbers.
Stem number from chart
(4 or 5 digits)
Number of Decks
Number of Poles/Deck
093103-2-045
Type of Contacts:
S=Shorting
N=Non-Shorting
Number of Positions/Pole
For all other dimensions and
specifications, see Standard
Switch pages.
SERIES 08,09,42,44,50
Spring Return
DIM
.
A
+ .046
(
1,17
)
–.020 (0,51)
DIM. B REF.
STUD PROJECTION
.
500
± .
015
(12,7 ± 0,38)
DIA.
.320 ± .015 (8,13 ± 0,38)
CIRCLE OF CENTERS
COMMON 36°
± 3°
DIM
.
A
+ .
046
(1
,
17)
–.020 (0,51)
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Rotary Switches
Special Function Rotary Switches
Con- Conven- Description Spring Return No. Poles Positions Per Location Of Term.
figur- tional Of Stem Number Of Per Pole & Contact Unique Position, Opp.
ation Switch Style (See Ordering Info.) Decks Deck Type Detent or Momentary Flat**
08A36 Standard 08317 1 to 6 1 02 to 05 (N or S) M 5 5
1 to 3 2 02 to 05 (N or S) M 5, 10 5
1 to 6 1 02 to 06 (N or S) M 6 6
1 to 3 2 02 to 06 (N or S) M 6, 12 6
09A30 Standard 09310 1 or 2 3 02 to 04 (N or S) M 4, 8, 12 4
1 4 02 or 03 (N or S) M 3, 6, 9, 12 3
DDDD
DM
1 5 or 6 02 (N or S) M 2, 4, 6, 8, 10, 12 2
42A36 Standard 42349 1 to 3 1 02 to 05 (N or S) M 5 5
1 2 02 to 05 (N or S) M 5, 10 5
42M36 Military 42352 1 to 3 1 02 to 05 (N or S) M 5 5
1 2 02 to 05 (N or S) M 5, 10 5
44A30 Standard 44346 1 to 3 1 02 to 06 (N or S) M 6 6
1 2 02 to 06 (N or S) M 6, 12 6
44M30 Military 44350 1 to 3 1 02 to 06 (N or S) M 6 6
1 2 02 to 06 (N or S) M 6, 12 6
08A36 Standard 08319 1 to 6 1 02 to 05 (N or S) M 1 1
1 to 3 2 02 to 05 (N or S) M 1, 6 1
1 to 6 1 02 to 06 (N or S) M 1 1
1 to 3 2 02 to 06 (N or S) M 1, 7 1
09A30 Standard 09312 1 or 2 3 02 to 04 (N or S) M 1, 5, 9 1
1 4 02 or 03 (N or S M 1, 4, 7, 10 1
1 5 or 6 02 (N or S) M 1, 3, 5, 7, 9, 11 1
MD
DDDD 1 to 3 1 02 to 06 (N or S) M 1 1
09M30 Military 09356 1 2 02 to 06 (N or S) M 1, 7 1
1 3 02 to 04 (N or S) M 1, 5, 9 1
42A36 Standard 42350 1 to 3 1 02 to 05 (N or S) M 1 1
1 2 02 to 05 (N or S) M 1, 6 1
42M36 Military 42353 1 to 3 1 02 to 05 (N or S) M 1 1
1 2 02 to 05 (N or S) M 1, 6 1
44A30 Standard 44312 1 to 3 1 02 to 06 (N or S) M 1 1
1 2 02 to 06 (N or S) M 1, 7 1
44M30 Military 44351 1 to 3 1 02 to 06 (N or S) M 1 1
1 2 02 to 06 (N or S) M 1, 7 1
50A36 Std., Solder Lug 503265-1-03N* 1 1 03N D 2 2
50P36 Std., PC Mount 503267-1-03N* 1 1 03N D 2 2
8A36 Standard 08316 1 to 6 1 03 (N or S) D 2 2
1 to 3 2 03 (N or S) D 2, 7 2
1 to 6 1 03 (N or S) D 2 2
9A30 Standard 09311 1 to 3 2 03 (N or S) D 2, 8 2
1 or 2 3 03 (N or S) D 2, 6, 10 2
1 4 03 (N or S) D 2, 5, 8, 11 2
MDM
42A36 Standard 42348 1 to 3 1 03 (N or S) D 2 2
1 2 03 (N or S) D 2, 7 2
42M36 Military 42351 1 to 3 1 03 (N or S) D 2 2
1 2 03 (N or S) D 2, 7 2
44A30 Standard 44345 1 to 3 1 03 (N or S) D 2 2
1 2 03 (N or S) D 2, 8 2
44M30 Military 44349 1 to 3 1 03 (N or S) D 2 2
1 2 03 (N or S) D 2, 8 2
CHOICES AND LIMITATIONS
*This is a complete (not stem) part number.
**Terminal opposite shaft flat when switch
is in its unique (detent or momentary)
position.
Available from your local Grayhill Distributor For prices and discounts, contact a local Sales
Office, an authorized local Distributor, or Grayhill.
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
www.grayhill.com
Catalog Ratings
Are catalog ratings misleading? In most cases,
yes. Load and life ratings shown in most catalogs
are usually invalid for most applications. This
results from the complex interplay of such factors
as environment, duty cycle, life limiting or failure
criteria, actual load, etc. Circuit designers should
be aware of these factors, and the effect they have
on the useful life of the switch in their applications.
The problem of switch rating arises from the wide
variety of requirements placed on the switch. This
includes various applications, and the sensitivity
of the switch to a change in requirements. If we
attempted to establish life ratings for all possible
applications, we would have an almost innite
variety of ratings.
To simplify the problem, switch manufacturers,
switch users, and the military, have established
certain references for ratings. These include
loads, life requirements, environments, duty
cycles, and failure criteria. These references
are arbitrarily established. But, they allow you to
compare different switch designs. They do not,
however, match the actual requirements for most
applications.
The curves shown here are an example of some
of the life load curves. These curves are life load
characteristics of the Grayhill 42M and 44M
switches. Note that the curves consider only two
voltage sources and two types of loads. These
voltages and loads are, however, considered as
standards for testing procedures by the industry.
Curve data is based on tests conducted at
sea level, 25°C and 68% relative humidity.
Cycle = 360° rotation and return. Cycling rate
is 10 cycles per minute. Switch rating is for
non-shorting contacts.
CYCLES x 1,000
0102550
1.7
1.5
1.2
1.0
.75
.50
.20
0
CURRENT (AMPS)
VOLTAGE 30 VDC
RESISTIVE
INDUCTIVE
(2.8 HENRIES)
These curves allow you to predict the expected life
of the switch once you know the voltage, current
and type of load. Also note that each cycle is
approximately a 360° rotation and a return. For a
ten position switch this would be a rotation from
position 1 to position 10 and back to 1. This cycle
runs approximately ten times a minute. Thus testing
causes more electrical and mechanical wear than
what the switch incurs in actual use.
Summary
The life and load ratings in this and other catalogs
are probably not totally valid for your application.
The bright side of the picture is that in most
applications the switch will perform better than its
ratings. This is because the standard industry test
conditions are more stringent than those found in
most applications.
This difference can be very dramatic. For example,
Grayhill’s 42A and 44A Series Rotary Switches, are
rated at 1 ampere (115 Vac resistive). However,
they will operate at 5 amperes in many applications.
To see how some major factors inuence switch
performance, read on.
USEFUL LIFE CRITERIA
The “useful” life of a switch in your application
depends on what you demand of it. This includes
parameters such as contact resistance, insulation
resistance, torque, detent feel, dielectric strength,
and many other factors. For example, a contact
resistance of 50 milliohms may be totally unusable
in certain applications such as a range switch in a
micro-ohm meter. In other applications a contact
resistance of 5 ohms may be perfectly satisfactory.
In establishing “useful” life for a switch in your
application, you must rst determine “failure
criteria,” or “end of life” parameters. At what level
of contact resistance, dielectric strength, etc., is the
switch no longer acceptable for your application?
Most switches are acceptable on all parameters
when new. There is a gradual deterioration in
performance with life. The rate of deterioration
varies greatly with basic switch design. Often,
circuit designers select a switch on the basis of
its performance when new. This is a mistake.
The performance of the switch after several
years of equipment use is more signicant. To
estimate this, rst determine the life limiting or
failure criteria for your application. In most uses,
important life-limiting (failure) criteria include the
following parameters:
Contact Resistance
Insulation Resistance
Dielectric Strength
Actuating Force
Contact Resistance
This is the resistance of a pair of closed contacts.
This resistance effectively appears in series with
the load. Typical values are in the range of a few
milliohms for new switches. These values usually
increase during life. The rate of increase is greatly
affected by the voltage, current, power factor,
frequency, and environment of the load being
switched. Typical industry standard “end of life”
criteria for this parameter are:
MIL-DTL-3786: 20 milliohms
(Rotary Switches)
MIL-S-6807: 20 milliohms
(Snap Pushbuttons)
MIL-S-8805: 40 milliohms
(Pushbuttons)
MIL-S-83504: 100 milliohms
(DIP Switches)
Contact resistance can be measured by a number
of different methods. All of them are valid depending
upon the switch application and the circuit.
Grayhill uses the method in applicable military
specications. This method species an open
circuit test voltage and a test current. The voltage
drop across the closed contacts is measured. The
contact resistance is determined by Ohm’s Law
from the test current and the measure voltage
drop. MIL-DTL-3786, MIL-S-6807 and MIL-S-8805
require a maximum open circuit test voltage of 2
Vdc; they require a test current of 100 milliamperes.
MIL-S-83504 requires a maximum test voltage of
50 millivolts and a test current of 10 milliamperes.
When a switch is rated to make and break 5 or more
amperes, there is a difference. Contact resistance
is determined by measuring the voltage drop while
the switch is carrying the maximum rated current.
The voltage drop that occurs across the contacts
determines, in part, the contact temperature. If
the temperature rise of the contacts is sufcient,
it affects contact material. A chemical reaction
will take place that can cause an insulating lm
to appear on the contacts. This lm is present
between the contacts during the next switching
operation. This lm formation can cause failure
due to increasing contact resistance. For switching
of very low voltages and currents, this resistance
may be the failure criteria.
7
6
5
4
3
2
1
00
CYCLES x 1,000
10 25 50
CURRENT (AMPS)
VOLTAGE 115 VAC
RESISTIVE
Rotary Switch Engineering Information
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
www.grayhill.com
Insulation Resistance
This is the resistance between two normally
insulated metal parts, such as a pair of terminals.
It is measured at a specic high DC potential,
usually 100 Vdc or 500 Vdc. Typical values for
new switches are in the range of thousands of
megohms. These values usually decrease during
switch life. This is a result of build-up of surface
contaminants. Typical industry standard “end of
life” criteria for the parameter are:
MIL-DTL-3786: 1000 megohms
(for plastic insulation)
MIL-S-6807: Not specied
MIL-S-8805: 2000 megohms
MIL-S-83504: 1000 megohms
Another special test condition is commonly
specied. It measures insulation resistance for
switches in a high humidity atmosphere (90%-98%
R.H.). In this condition, condensation of moisture
commonly occurs on the surface of the insulating
material. Some types of insulation will absorb
varying amounts of moisture. This will normally
lower the insulation resistance. Typical industry
values for this condition are:
MIL-DTL-3786: 10 megohms
(for plastic insulation)
MIL-S-6807: 3 megohms after
drying
MIL-S-8805: 10 megohms
(for plastic material)
MIL-S-83504: 10 megohms
Dielectric Strength
This is the ability of the insulation to withstand
high voltage without breaking down. Typical
values for new switches in this test are in excess
of 1500 Vac RMS. During switch life, contaminants
and wear products deposit on the surface of the
insulation. This tends to reduce the dielectric
withstanding voltage. In testing for this condition,
a voltage considerably above rated voltage is
applied. Then, the leakage current is measured
at the end of life. Typical industry standard test
voltages and maximum allowable leakage currents
are as follows:
MIL-DTL-3786: 1000 Vac and 1 mA
maximum leakage
MIL-S-6807: 600 Vac RMS after life
10 microamperes
maximum leakage
MIL-S-8805: 1000 or 1000 plus
twice working voltage
(AC) RMS and 1mA
maximum leakage
MIL-S-83504: 500 Vac and 1 mA
maximum leakage
UL Standard: 900 Vac without
breakdown (UL
Standard (dependent
on test)
Voltage breakdown is another method for
describing the ability of the insulating material
to withstand a high voltage. Voltage breakdown
describes the point at which an arc is struck and
maintained across the insulating surface with the
voltage applied between the conducting members.
ADDITIONAL LIFE FACTORS
Effect of Loads
On any switch, an arc is drawn while breaking a
circuit. This causes electrical erosion of the contacts.
This erosion normally increases contact resistance
and generates wear products. These wear products
contaminate insulating surfaces. This reduces
dielectric strength and insulation resistance.
The amount of this erosion is a function of current,
voltage, power factor, frequency and speed of
operation. The higher the current is, the hotter
the arc and the greater the erosion. The higher
the voltage is, the longer the arc duration and the
greater the erosion.
Inductance acts as an energy storage device. This
returns its energy to the circuit when the circuit
is broken. The amount of erosion in an inductive
circuit is proportionate to the amount of inductance.
Industry standard test inductance as described in
MIL-I-81023 is 140 millihenries. Other test loads
include 250 millihenries and 2.8 henries.
Frequency can also affect erosion. The arcing
ends when the voltage passes through zero. To
a certain extent, the following is true. The higher
the frequency, the sooner arcing ends, the lower
the erosion.
The speed of operation affects the duration of the
arc. Fast operation can extinguish the arc sooner.
This reduces the erosion, unless the air within the
switch is completely ionized.
Actuating Force
Rotational torque is the actuating force required to
turn a rotary switch through the various positions.
The actual torque or force required depends on
the design of the switch. It varies widely from one
design to another. See appropriate MIL Specs or
manufacturers literature for typical industry values
for specic designs.
When torque or force values are specied, it
is customary to give a minimum and maximum
value. During life, two offsetting factors may occur
to change the initial value. Relaxation of spring
members will tend to lower torque or force values.
Wear or “galling” of mating surfaces, however,
may tend to increase these values. Typical end
of life specications may require the switch to fall
within the original range. Or, they may specify a
maximum percentage change from original value.
For example, “the rotational torque shall not change
more than 50% from its initial value.
Effect of Ambient Temperature
Temperature extremes may affect switch
performance and life. Very high temperatures
may reduce the viscosity of lubricants. This allows
them to ow out of bearing areas. This can hasten
mechanical wear of shafts, detents, plungers, and
cause early mechanical failure. Contact lubricants
are sometimes used. Too little lubrication can
result in a high rate of mechanical wear. Too much
lubrication owing from other bearing areas can
adversely affect dielectric strength and insulation
resistance.
Through careful design and selection of lubricants
most manufacturers attempt to minimize these
affects. Nevertheless, continual operation in high
ambient temperatures will shorten the life of a
switch regardless of design.
Extremely low ambient temperatures may also
create problems. Low temperatures may cause an
increase in the viscosity of the contact lubricant.
Higher viscosity can delay or prevent the closing
of contacts, causing high operating contact
resistance. Under certain atmospheric conditions,
ice may form on the contact surfaces. This also
causes high and erratic contact resistance.
Neither of these conditions may materially
reduce the life of the switch. However, it may
cause unsatisfactory operation. If the voltage of
the circuit is high enough, it can break down the
insulating layer. Some current will ow through the
high resistance contacts. A local heating action is
created, which tends to correct the condition in a
short period of time.
Switches with high contact pressures may minimize
the low ambient temperature effect. This is
particularly true if the application calls for switching
signal level voltages and currents.
Effects of Altitude
In high altitudes, barometric pressure is lower. Low
pressure reduces the dielectric strength of the air.
The arc strikes at a lower voltage and remains
longer. This increases contact erosion. Switches
for use in high altitudes will therefore require de-
rating in terms of loads and/or life.
Effects of Duty Cycle
Mechanical life testers cause accelerated life
testing. Testers operate switches at a rate of
approximately 10 cycles per minute. This rate is
greatly in excess of normal manual operation in
equipment. It constitutes a severe test of the switch.
Lubricants do not have an opportunity to redistribute
themselves over the bearing surfaces at this duty
cycle. The contact heating caused by arcing does
not have a chance to dissipate.
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
www.grayhill.com
Thus, the switch runs “hot”, increased mechanical
wear and contact erosion result. Your application
probably requires manual operation of the switch
with an attendant low duty cycle. If so, you can
usually expect much longer switch life than is
shown by the accelerated life laboratory life tests.
Conclusion
Remember, load and life ratings are based
on manufacturers’ selected references. They
include accelerated life tests and an arbitrary
set of application parameters and failure criteria.
These parameters and criteria may not always
t your application.
Then how do you know if a switch will give reliable
performance in your application?
How do you know if it will last the life of your
equipment?
Ask the switch manufacturer. Grayhill, and most
other reputable manufacturers have compiled
vast quantities of test data. We are in a position
to give a good estimate of a switch’s performance
in many nonstandard applications. You should
provide the following data:
Expected Life: in number of cycles
Load: voltage, current, power
factor, and frequency
Operation: manual or mechanical, duty
cycle
Application: type of equipment
Environment: altitude, ambient
temperature range
relative humidity, corrosive
atmosphere, shock,
vibration, etc.
Failure Criteria: e n d o f l i f e c o nt a c t
resistance, dielectric
strength, insulation
resistance, etc.
With this information, we can usually estimate
if a given switch is suitable for your application.
Soldering
What causes failure in a new switch after it
has been installed? The principle failure is high
contact resistance caused by solder ux on the
contact surfaces. To avoid this, be sure to follow
good soldering practices. Use the proper solder
with the proper ux core, maintain the proper
soldering temperature, use the proper soldering
iron tip for the work, and never use liquid ux
when soldering a switch.
Do not use solvent baths or washes with any
unsealed electromechanical parts. Switches,
unless they have been especially protected suffer
badly. Solvents readily dissolve uxes and carry
them into the contact area of switches. A thin, hard
ux coats the contact surface after the solvent
evaporates. Additionally, solvents may dissolve
and wash away lubricants in switches. Lubricant
loss may prevent proper mechanical action.
Exercise similar precautions when you mount a
switch to a printed circuit board. Maintain proper
solder temperatures and follow proper cleaning
techniques. Avoid subjecting these switches to
lengthy solder baths. The excessive heat can
deform the plastics.
RFI/EMI Shielding
Some applications require shielding against Radio
Frequency Interference and/or Electro-Magnetic
Interference. Experts feel that the most effective
way to achieve shielding is to provide a conductive
bridge across the component mounting hole.
They also generally agree that there is no good
method for testing shielding. So, the equipment
manufacturers themselves must identify and solve
specic problems. Component manufacturers
can generally assist in the solution of shielding
problems.
RFI/EMI testing is incorporated into MIL-
DTL-3786 for rotary switches. Requirements
are 1.0 ohm maximum dc resistance between
the mounting bushing and operating shaft
initially and 10.0 ohm maximum dc resistance
following environmental and mechanical tests.
Many equipment manufacturers feel they are
satisfying their needs with a measurement of .025
to 10 ohms for the expected life of the switch.
Under most circumstances, standard non-sealed
switches pass the larger value easily. The lower
value (.025 ohms) requires special attention and
parts for compliance over the life of the switch.
Switch Selection
Whenever possible, use standard switches and
contact congurations. Standards provide the
greatest economy and the best delivery. When
you need a deviation, it pays to consult with your
suppliers as soon as possible. At the early stages
of the design, there are many low cost options
for achieving the results. At the late stages of
design, some of the options may no longer be
open. For example, size may be restricted. This
might result in a more costly redesign.
Typical standard rotary options are as follows:
coded contacts, homing rotor effect, progressively
shorting contacts, PC mountable terminals, rotary
switch spring return positions, and push-to-turn
or pull-to-turn mechanisms.
Limited panel space may be solved by a concentric
shaft rotary switch. It is two rotary switches,
located one behind the other. There are other
concentric shaft possibilities. A rotary switch can
be combined with another component. These
include a potentiometer, a pushbutton switch, and
a mechanical element. The most cost effective
design may be one of these concentric options.
But, selection must be made at the outset of
equipment design.
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
www.grayhill.com
Max. Positions Angle Of Maximum Maximum Poles Shorting Or Solder Lug Series
1 Deck (1Pole)* Throw Decks** Per Deck*** Non-Shorting Or PC Number
24 15° 12 12 N or S Solder 53
20 18° 12 10 N or S Solder 59
16 22°30' 12 8 N or S Solder 57
16 22°30' 1 2 N or S Both 51
12 30° 12 6 N or S Both 71
12 30° 12 6 N or S Both 9
12 30° 12 6 N or S Solder 44
12 30° 1 4 N or S Both 51
12 30° 1 4 N or S Both 56
11 30° 1 1 N **** 19
10 36° 12 2 N or S Both 8
10 36° 12 2 N or S Both 71
10 36° 12 2 N or S Both 42
10 36° 1 2 N PC 75/77
10 36° 1 2 N or S Both 50
10 36° 1 2 N or S Both 56
10 36° 1 1 N or S Both 24
10 36° 1 1 N or S Solder 5000
8 45° 12 4 N or S Both 9
8 45° 12 4 N or S Solder 44
8 45° 1 2 N Both 50
6 60° 6 3 N Both 9
6 60° 12 3 N Solder 44
6 60° 1 2 N Both 50
4 90° 12 2 N Solder 44
4 90° 6 2 N Both 9
4 90° 1 2 N Both 50
** Based on 1 pole per deck. Number of decks
is also limited by the total number of poles.
Single Deck Switch Series Multi-Deck Switch Series
19 24 50/51 56 75 77 5000 08/09 42/44 43/54 53,57,59 71
25,000 Cycles At Load (Amps) — 1 .050 — — .050 1 .250 1,3,5* 1,3,5* — .250
10,000 Cycles At Load (Amps) — — .200 .200 .100 — — .500 1,3,5* 1,3,5* .150, .250* —
6,000 Cycles At Load (Amps, UL) 15 — — — — — — — — — — —
* Varies with angle of throw and style.
Maximum Dimension Single Deck Switch Series Multi-Deck Switch Series
In Inches (& Millimeters) 19 24 50 51 56 75 77 5000 08 09 42 44 53 57 59 71
Diameter, Behind Panel 2.280 1.015 .500 .561 .500 .298 1.015 .687 .750 1.015 1.170 1.350 1.190 1.190 .750
Length Behind Panel, 1 Deck .950 .580 .698 .698 .355 .500 .470 .960 .960 1.025 1.025 .916 .916 .916 .760
Behind Panel, Add'l Deck — — — — — — — — .268 .268 .346 .346 .329 .326 .326 .218
Diameter, Behind Panel (57,9) (25,8) (12,7) (14,2) (12,7) (7,6) () (25,8) (17,4) (19,0) (25,8) (29,7) (34,3) (30,2) (30,2) (19,0)
Length Behind Panel, 1 Deck (24,1) (14,7) (17,7) (17,7) (9,0) (12,7) () (11,9) (24,4) (24,4) (26,0) (26,0) (23,3) (23,3) (23,3) (19,3)
Behind Panel, Add'l Deck — — — — — — — — (6,8) (6,8) (8,8) (8,8) (8,4) (8,3) (8,3) (5,5)
1. SELECT A FACTOR
All switches are rated to make and break at least 100 milliamperes for 10,000 cycles of operation. Rating becomes a matter of interpretation. Carefully
review the Engineering Information on the previous pages. Ratings which assure a different life are possible; contact Grayhill.
FACTOR: Current Life Rating
FACTOR: Size
* If multi-deck switch is needed, contact Grayhill.
FACTOR: Circuitry
* Maximum positions per pole depends
on number of poles per deck.
*** Limited by total number of poles per switch.
****Choice of Faston or Solder Lug terminals.
Bulletin 1220
Rev 04/14
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
www.grayhill.com Patent Pending
©2013
• Custom Switches With No
Tooling Required
• Easily Ordered Specials
1. Dummy Terminal
Used as tie point, it is not an active switch
position. Can be located at any specied posi-
tion outside of active switch terminals. Priced
as active position. Example, a three position
switch with 2 dummy terminals would be
priced as a ve position switch.
2. Enlarged Wire Holes
Series 08A, 09A, 42H, 42M, 44H, and 44M:
Lug terminals for several wires; standard in Series
08M, 09M, 53, 57, and 59 switches.
3. High Density Wiring Terminal
The gold-plated terminal features a slot to accept
wires in addition to the conventional wire hole.
4. Taper Tab Terminals
Used in place of conventional solder lug terminals.
Taper tab terminals are gold plated.
5. Notched Terminals
Used in place of the conventional solder lug
terminals.
6. External Shorting Links
External shorting links, as shown in the drawing,
can be used in place of conventional solder
lug terminals in the Series 5000, 24, 42 or 43
rotary switches. Shorted terminals can also be
accomplished internally in the Series 71 rotary
switches. Solder lug terminals can be intermixed
on the same deck.
7. Non-Standard, Non-Turn
Devices
Switches without tabs
Series 08, 09, 42 and 44: There is no additional
charge for a front support plate without a non-
turn tab.
Non-turn tab of non-standard projection
Series 08:
All tabs located at .260 inch radius from cen-
terline of switch. The following projections
(inches) are available: .121; .094; .045; .032
Series 44:
From Centerline Projection
.375" (9,53 mm) .062" (1,57 mm)
.531" (13,49 mm) .121" or .049"
(3,07 or 1,24 mm)
8. RFI Grounding
A silver-plated shaft and wave washer improve
DC grounding of shaft to mounting bushing, thus
minimizing possible radio frequency interfer-
ence. Example: static and dynamic DC resis-
tance after 25,000 cycle life test is maximum
100 milliohms. For concentric shaft switches,
discuss grounding with factory. Special handling
charges apply to small lots.
9. Electrostatic, Electromagnetic
Shielding
A metallic shield can be added between decks.
Grounding of the shield provides additional RFV
/EMI protection, Size and shape of the shield
depends on the equipment conguration and the
amount of protection required Price is depen-
dant onthe number and type of shields required.
10. Unidirectional Rotation
The detenting system permits rotation in only one
direction. Usable only with continuous rotation
switches. Specify direction of rotation. Applicable
to 30° and 36° throw switches only.
.032 ± .001
(0,81 ± 0,03)
R (2)
.045
(1,14)
.034 ± .003
(0,86 ± 0,07)
.072 +.000 –.002
(1,83 –0,05)
.068 ± .005
(1,73 ± 0,13)
.096 ± .001
(2,44 ± 0,03)
.0635 + .002 –.001
(1,61 + 0,05 – 0,02)
DIAMETER
.095 (2,41)
.079 (2,01)
.280 (7,11)
45°
.045
(1,14) .047 (1,19)
.096 ± .001
(2,44 ± 0,03)
.062 ± .003
(1,57 ± 0,08)
DIAMETER
Rotary Switch Standard Options
Switch Options For Styles A and S Options For All Styles
Series# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
08 x x x x x x
09 x x x x x x
24 x x x x x x
42 x x* x x x x x x x x x x
43 x x x x x x* x x x
44 x x* x x x x x x x x x
50/51 x x
56 x x
53/57/59 x
54 x x x x x* x x x x x
71 x* x x
5000 x x x x x x
* See description below for limitations.
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
www.grayhill.com
11. Intermixing of Shorting and Non-
Shorting Contacts
In some switches, non-shorting and shorting
contacts can be intermixed between decks. A
2-deck switch, for example could have shorting
contacts on deck 1 and non-shorting contacts
on deck 2. In a few switches, non-shorting
and shorting contacts can also be intermixed
between poles. A 2-pole per deck switch, for
example, could have non-shorting on pole #1,
and shorting on pole #2.
Series 08 and 09:
An 09M30 or 08M36 rotary switch can have
shorting and non-shorting contacts intermixed
between decks. Shorting and non-shorting
contacts can be intermixed between poles as
well as decks in styles A, S, P, and SP.
Series 42, 43, 44, and 54, in 30° or 36°:
Non-shorting and shorting contacts can be
intermixed between poles or decks.
Series 50, 51, and 56:
Non-shorting and shorting contacts can be
intermixed between poles.
Series 71:
Non-shorting and shorting contacts can be
intermixed between poles in xed stop switches
only.
Priced the same as standard switches. The
type of contacts on each pole must be precisely
indicated.
12. PC Mount Switches With
Terminals From One Side
of Switch
Series 71 PC mount switch has all terminals
on one side.
Series 08P, 09P, and 42P with non-shorting
contacts are also available with terminals limited
to one side. Contact Grayhill for a special part
number. This is accomplished by using 2 decks
per pole and placing the rotating contacts 180°
out of phase on each deck. The rst deck picks
up the rst half of the positions; the second
deck picks up the last half of the positions.
Common terminals are tied together by the PC
board circuitry.
A total of 12 decks (6 usable poles) is the
maximum per switch. Switches with the
maximum number of positions (12 for 30°,
or 10 for 36°) will have continuous rotation.
Rotation can be limited to less than the maximum
positions. For example, an 8 position Series 8P36
switch with terminals on one side, would pick
up 5 positions on the rst deck and 3 positions
on the second deck.
Price is the same as standard switches with
comparable number of decks and positions.
Example: an 08P36, 1-pole, 10 position switch
with terminals on one side of the switch would
be priced as a 2 deck, ve position, one pole
per deck switch.
13. Homing Rotor (Bridging and
Shorting Deck) and Progressively
Shorting Deck
A homing rotor (bridging and shorting) switch
deck connects all terminals to the common except
the terminal in the selected switch position. For
example, in position 1, terminals 2 thru 12 are
CIRCUIT
DIAGRAM
HOMING
ROTOR DECK
1
2
3
4
5
6
7
8
9
10
11
12
C
connected to the common, and terminal 1 is
open. In position 2, terminal 3 thru 12 and 1 are
connected to the common, and terminal 2 is
open. A homing rotor deck will function for 25,000
mechanical cycles of operation.
The progressively shorting switch deck connects
consecutive switch positions to the common. For
example, in position 1, terminal 1 is connected
to the common; in position 2, terminals 1 and
2 are connected to the common; in position
CIRCUIT
DIAGRAM
PROGRESSIVELY
SHORTING DECK
1
2
3
4
5
6
C
3, terminals 1,2, and 3 are connected to the
common. A progressively shorting deck is limited
to a maximum of 6 positions. A progressively
shorting deck will function for 25,000 mechanical
cycles of operation.
Homing Rotor or Progressively Shorting decks
can be ordered as a deck of a 44A or 44M style
switch, or their sealed equivalents. Order up to
11 conventional decks and 1 special circuitry
deck. For a good detent feel, the switch is limited
to a total of 12 poles plus the homing rotor or
progressively shorting deck. Example: 6 2-pole
decks and a homing rotor. When these special
decks are used in combination with conventional
decks, it is important to remember that the stop
system limits the rotation of both types of decks.
For example, when a homing rotor deck Is used
in combination with a 6-position conventional
deck, the homing rotor is likewise limited to six
positions.
O-RINGS
14. Shaft and Panel Seal on
Concentric Shaft Switches
The following diagram shows the location of
the O-rings required to seal the shafts to the
bushings. When the concentric shaft switches
are sealed in this manner, the .125 inch diameter
shaft is supplied full round. Bushing-to-panel
sealing is accomplished by the panel seal kit.
15. Fixed Stop, Add-A-Pot
Switches
The rotary switch section of the Add-A-Pot rotary
switches can be built with a xed mechanism
rather than the standard adjustable stop
mechanism. The front end of a switch of this type
is similar to the Series 43A or Series 54A style
concentric rotary switches. The total number of
decks is limited to three. The Series 43 is limited
to 1 pole per deck. Series 54 to 2 poles per deck.
16. Series 54 Concentric Shaft
Switch in 45°, 60°, and 90°
Throws
The Series 54A switch is available with these
angles of throw in Section A of the concentric
rotary switch. Section B is available in 30° angle
of throw only. Section A is limited to 1 to 3 decks,
non-shorting contacts, and 1 or 2 poles per deck.
Bulletin 1222
Rev 04/14
Specifications are subject to change. Please refer to the current datasheet on www.grayhill.com for the most current published specifications for this product.
