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MEDER electronic
DESCRIPTION
APPLICATIONS
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
Position and limit switch
Pneumatic or hydraulic actuator position
End motion detection for linear drive
Indication and end travel limit switch
Machine industry
End motion detection and door/ap control
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DIMENSIONS
All dimensions in mm [inch]
FEATURES
High power switches available
Designed for high temperature up to 160o C
(molded version)
Four operate sensitivities available
A choice of cable terminations and lengths are
available
Molded and potted versions available
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MK21 sensors are magnetically operated Reed
proximity switches designed for screw mounting.
The sensor should be mounted on a xed surface
with the actuating magnet on the moving surface.
Introduction or removal of the magnetic eld
determines the closing and opening of the Reed
Switch. Leads are Teon coated. Designed for
extreme environment. Resistant to water, fuels,
oils, inks and most acids.
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MEDER electronic MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
MAGNETIC SENSITIVITY
TERMINATION
For wire and termination details, as well as other magnetic sensitivity classes please contact factory.
Part Number Example
MK21M - 1A66 C - 500 W
MK21P - 1A66 C - 500 W
M = molded
P = potted
66 is the switch model
C is the magnetic sensitivity
500 is the cable length (mm)
ORDER INFORMATION
Sensitivity
Class
Pull In
AT Range
B 10 - 15
C 15 - 20
D 20 - 25
E 25 - 30
Series Contact-
form
Switch
Model
Magnetic
Sensitivity
Cable
Length
(mm)
Termination
MK21x- xx xx x - xxx W
Options
1 Form A
66 B, C, D, E
500*
52, 85 C, D, E
1 Form B“*
1 Form C** 90 C, D, E
* Other cable lengths available
** Potted version
W
The cable cut length includes:
5 mm of wire stripped and tinned.
272
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MEDER electronic
MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
CONTACT DATA
All Data at 20° C Switch Model →
Contact Form →
Switch 52
Form A
Switch 66
Form A
Contact Ratings Conditions Min. Typ. Max. Min. Typ. Max. Unit
Switching Power Any DC combination of V & A not to
exceed their individual max.‘s
50
70 (VA) 10 W
Switching Voltage DC or peak AC 250 200 V
Switching Current DC or peak AC 0.5 0.5 A
Carry Current DC or peak AC 2.5 1.25 A
Static Contact Resistance w/ 0.5 V & 10 mA 200 150 mΩ
Dynamic Contact Resistance Measured w/ 0.5 V & 50 mA ,
1.5 ms after closure 200 mΩ
Insulation Resistance across
Contact 100 volts applied 1010 1010*Ω
Breakdown Voltage across
Contact Voltage applied for 60 sec. min. 600 225* VDC
Operate Time incl. Bounce Measured w/ 100 % overdrive 1.0 0.5 ms
Release Time Measured w/ no coil suppression 0.1 0.1 ms
Capacitance at 10 kHz cross contact 0.2 0.2 pF
Contact Operation **
Must Operate Condition Steady state eld 10 30 10 60 AT
Must Release Condition Steady state eld 4 27 4 54 AT
Environmental Data
Shock Resistance 1/2 sinus wave duration 11 ms 50 50 g
Vibration Resistance From 10 - 2000 Hz 20 20 g
Ambient Temperature M 10°C/ minute max. allowable -20 85 -30 150 oC
Ambient Temperature P 10°C/ minute max. allowable -35 85 -20 85 oC
Stock Temperature 10°C/ minute max. allowable 260 -40 160 oC
Soldering Temperature 5 sec. 260 260 oC
Please note: The indicated electrical data are maximum values and can vary downwards when using a more sensitive
switch.
* Insulation resistance of 1012 and breakdown voltage of 480 VDC is available.
** These ranges refer to the uncut / unmodied Reed Switches described in our Reed Switch section. Consult factory if
more detail is required.
273
www.meder.com
MEDER electronic MK21 Series
Reed Sensors with Mounting
Holes for Screw Fastening
CONTACT DATA
All Data at 20° C Switch Model →
Contact Form →
Switch 85
Form A
Switch 90
Form B/C, potted
Contact Ratings Conditions Min. Typ. Max. Min. Typ. Max. Unit
Switching Power
Any DC combination of V & A
not to exceed their individual
max.‘s
100 20 W
Switching Voltage DC or peak AC 400 175 V
Switching Current DC or peak AC 1.0 0.5 A
Carry Current DC or peak AC 2.5 1.0 A
Static Contact Resistance w/ 0.5 V & 10 mA 150 150 mΩ
Dynamic Contact Resistance Measured w/ 0.5 V & 50 mA ,
1.5 ms after closure 200 250 mΩ
Insulation Resistance across
Contact 100 volts applied 1010 109Ω
Breakdown Voltage across
Contact
Voltage applied for 60 sec.
min. 4000 200 VDC
Operate Time incl. Bounce Measured w/ 100 % overdrive 1.0 0.7 ms
Release Time Measured w/ no coil
suppression 0.1 1.5 ms
Capacitance at 10 kHz cross contact 0.2 1.0 pF
Contact Operation **
Must Operate Condition Steady state eld 20 60 15 40 AT
Must Release Condition Steady state eld 12 54 AT
Environmental Data
Shock Resistance 1/2 sinus wave duration 11 ms 50 50 g
Vibration Resistance From 10 - 2000 Hz 20 20 g
Ambient Temperature M 10°C/ minute max. allowable -20 85 -20 85 oC
Ambient Temperature P 10°C/ minute max. allowable -35 85 -35 85 oC
Stock Temperature 10°C/ minute max. allowable 260 260 oC
Soldering Temperature 5 sec. 260 260 oC
Please note: The indicated electrical data are maximum values and can vary downwards when using a more
sensitive switch.
* Insulation resistance of 1012 and breakdown voltage of 480 VDC is available.
** These ranges refer to the uncut / unmodied Reed Switches described in our Reed Switch section. Consult
factory if more detail is required.
