1
Catalog 1308242
Issued 4-15 (PDF Rev. 04-15)
Revised 04-15
www.te.com
Dimensions are in inches over
(millimeters) unless otherwise
specified.
Dimensions are shown for reference
purposes only. Specifications and
availability subject to change.
South America: 55-11-2103-6000
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-8706-080208
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-1106-0803
Potter & Brumeld
Agency Approvals
W57 series is UL1077 Recognized as Supplementary Protectors,
File E69543, for Canada and the United States. Available models
meet Ignition Protection requirements in accordance with UL1500.
Approved to VDE 0642/EN60934 (Circuit Breakers for Equipment)
License Number 40007874 (excludes models rated 3-4A and >15A).
CCC mark compliant, certificate 2004010307123217.
Users should thoroughly review the technical data before selecting a product part
number. It is recommended that users also seek out the pertinent approvals files
of the agencies/labora-tories and review them to confirm the product meets the
requirements for a given application.
Time vs. Current Trip Curve @ +25°C
Overload Trip Times
100%
135%
200%
300%
400%
500%
600%
800%
1000%
No Trip
Trip in 1 hour
4.0 - 40.0 Sec.
1.2 - 12.0 Sec.
0.6 - 5.0 Sec.
0.4 - 2.8 Sec.
0.3 - 1.8 Sec.
0.18 - 0.9 Sec.
0.12 - 0.7 Sec.
.1 110100 1000
Time In Seconds
1000
900
800
700
600
500
400
300
200
100
0
Load Current As A Percent
Of Breaker Rating
10,000
135
Features
• New, compact design.
• 3 to 20 amp ratings.
• Cannot be manually tripped.
• Button extends for visual trip indication.
• Push button to reset breaker.
• Numerous mounting and termination options.
• Optional bottom marking of amperage rating.
Electrical Data @ 25°C
Calibration: Will continuously carry 100% of rating.
May trip between 101% and 134%, but must trip at 135% of
rating within one hour at +25°C.
Dielectric Strength: 1,500VAC (60 seconds).
Mechanical/Environmental Data
Operating Temperature Range: 0°C to +60°C.
Termination: .250” (6.35mm) quick connects.
Mounting: Various options. See Ordering Information and drawings.
Approximate Weight: 0.5 oz. (14.3g).
Current Typical Current Typical
Rating Resistance Rating Resistance
in Amps in Ohms in Amps in Ohms
3.0 0.083 8.0 0.031
4.0 0.062 10.0 0.025
5.0 0.050 12.0 0.021
6.0 0.042 15.0 0.017
7.0 0.036 20.0 0.012
SEE TERMINAL DRAWINGS
FOR DETAIL
.575
(14.6)
.102
(2.6)
.031
(.8)
.303
(7.7)
.465
(11.8)
.889
(22.6) .457
(11.6)
.689
(17.5)
1.15
(29.2)
SEE MOUNTING
BUSHING AND
MOUNTING HARDWARE
DRAWINGS FOR DETAIL
Outline Dimensions
Typical Resistance vs. Current Rating @ +25°C
Insulation Resistance: 100 megohms.
Maximum Operating Voltages: 50VDC; 250VAC, 50/60 Hz.
Interrupt Capacity: 1,000 amps in accordance with UL standard 1077.
Resettable Overload Capacity: Ten times rated current.
Reset Time: 60 seconds.
W57 series
Compact, Push To Reset Only
P&B Thermal Circuit Breaker
Ambient Compensation Table
To use this chart: Divide the breaker
rating by the correction factor to
determine the compensated rating.
Calculate the overloads in terms of
the compensated rating to use the
published trip curve.
Do not use these devices outside
their specified operating temperature
ranges.
Ambient Rating Correction Factor
Temperature
in °C 3-4A Models 5-20A Models
-10 .70 .77
0 .75 .85
10 .82 .90
20 .90 .95
25 1.00 1.00
30 1.10 1.05
40 1.25 1.15
50 1.61 1.25
60 2.15 1.40
Optional Protective Boot
Silicone rubber boot is bonded to integral alumimum nut.
1-1423696-5
Black boot for W57 with
3/8”-24 bushing.
1-1423696-6
Clear boot for W57 with
M11 X 1.0 bushing.
.63 DIA.
(16.0)
.622
(15.8)
.799
(20.3)
.70 DIA.
(17.8)
2
Catalog 1308242
Issued 4-15 (PDF Rev. 04-15)
Revised 04-15
www.te.com
Dimensions are in inches over
(millimeters) unless otherwise
specified.
Dimensions are shown for reference
purposes only. Specifications and
availability subject to change.
South America: 55-11-2103-6000
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-8706-080208
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-1106-0803
Potter & Brumeld
Mounting Bushings and Recommended Panel Cutouts
.303
(7.7)
.425
(10.8)
.378
(9.6) .394
(10.0)
.059
(1.5) .043
(1.1)
.394
(10.0)
.043
(1.1)
.338
(8.6)
.378
(9.6)
.059
(1.5)
.386
(9.8)
.378
(9.6)
.059
(1.5)
.386
(9.8)
.543±.005
(13.8±.13)
.630±.005
(16±.13)
.394+.008, -.0
(10.0+.2, -.0)
.441+.008, -.0
(11.2+.2, -.0)
.394+.008, -.0
(10.0+.2, -.0)
.441+.008, -.0
(11.2+.2, -.0)
.382 +.008, -.0
(9.7 +.2, -.0)
.346 +.008, -.0
(8.8 +.2, -.0)
.311 +.008, -.0
(7.9 +.2, -.0)
.382 +.008, -.0
(9.7 +.2, -.0)
.433 +.008, -.0
(11.0 +.2, -.0)
.480 +.008, -.0
(12.2 +.2, -.0)
Option 5 – M11 X 1.0 Thread
Option 2 & 6 – 3/8” - 24UNF Thread Option 4 – Snap In Option
Ordering Information
Option 8 – 3/8” - 24UNF Thread
Typical Part No. > W 57 -X B 1 A 4 A 1 0 -4
1. Designator:
W = Circuit breaker
2. Series Number:
57 = Compact, Single Pole, Push-to-Reset, Thermal Model
3. Circuit Function:
X = Series Trip
4. Button Color & Rate Marking:
A = White, plain, no rate marking G = White, black rate marking (horizontal)
B = White, red rate marking (vertical) H = Black, white rate marking (vertical)
C = White, black rate marking (vertical) I = Red, plain, no rate marking
D = Black, plain, no rate marking J = Black, no rate marking on button,
E = Black, white rate marking (horizontal) white rate marking on bottom of
F = White, red rate marking (horizontal) case between terminals.
5. Mounting Bushing:
1 = Plastic, 9.8mm (double D) X 9.6mm long, M11x1 threads, (similar to 7/16”), hex base
2 = Plastic, 3/8” (single D) x 10.5mm long, 3/8”x24 threads, hex base
4 = Plastic, snap-in type
5 = Metal, 9.8mm (double D) X 9.6mm long, M11x1 threads, (similar to 7/16”), round base
6 = Metal, 3/8” (single D) x 10.5mm long, 3/8”x24 threads, hex base
7 = Metal, 10.8mm (double D) x 9.6mm long, M12x1 threads, (similar to 15/32”), round base
8 = Metal, 3/8” (double D) x 10.0mm long, 3/8”x24 threads, hex base
Notes: Codes 1 and 3 are similar in size to 7/16” bushings (not exact equivalent).
Code 7 is similar in size to a 15/32” bushing (not exact equivalent)
6. Terminals: (see drawings for detail)
A = Quick connect .250” (6.35mm) straight
B = Quick connect .250” (6.35mm) , bent 90°
C = Quick connect .250” (6.35mm) , bent 45°
D = Quick connect .250” (6.35mm) , bent 90°
E = Quick connect .250” (6.35mm) , bent 90°, PCB compatible
F = Quick connect .250” (6.35mm) , bent 90°, PCB compatible
G = Quick connect .250” (6.35mm) , straight (smaller hole)
H = One quick connect .250” (6.35mm) , one #8-32 screw bent 90°
I = Same as F above, but amperage marking reversed.
7. Mounting Hardware:
4 = Metal knurled nut/hex nut 7 = Plastic knurled nut
6 = Metal hex nut 8 = Plastic knurled nut with small hole
12 = Metal knurled nut 22 = Plastic knurled nut, metal lockwasher
15 = 2 metal hex nuts, metal lockwasher
18 = Metal hex nut, metal lockwasher 99 = None
8. Mounting Hardware Packaging:
A = Assembled to bushing B = Bulk unassembled C = No mounting hardware.
9. Maximum Operating Voltage (AC):
1 = 250VAC 2 = 125VAC/50VDC
10. Nameplate:
0 = None 1 = Embossed aluminum 2 = Silver color printing on black color 3 = Black color printing on silver color
11. Specify Amp Rating:
3† 4† 5 6 7 8 10 12 15 20† †Not VDE
12. UL Recognition:
Leave Blank = UL1077 recognized breaker
M = Model meeting Ignition Protection requirements in accordance with UL1500, in addition to UL1077 recognition† †Not VDE
Our authorized distributors are more likely to stock the following items for immediate delivery.
Option 1 – M11 X 1.0 Thread
Option 7 – M12 X 1.0 Thread
ORDERING NOTE: Mounting hardware can be ordered separately. Some options are subject to extended leadtimes and significant minimum order quantities.
W57-XB1A4A10-5
W57-XB1A4A10-10
W57-XB1A4A10-15
W57-XB1A4A10-20
W57-XB1A7A10-5
W57-XB1A7A10-10
W57-XB1A7A10-15
W57-XB1A7A10-20
3
Catalog 1308242
Issued 4-15 (PDF Rev. 04-15)
Revised 04-15
www.te.com
Dimensions are in inches over
(millimeters) unless otherwise
specified.
Dimensions are shown for reference
purposes only. Specifications and
availability subject to change.
South America: 55-11-2103-6000
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-8706-080208
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-1106-0803
Potter & Brumeld
.854 DIA.
(21.7)
.945 DIA.
(24.0)
.016 (.4) THICK .016 (.4) THICK
A
B
2 X .059 DIA.
(1.5)
84° 56°
ALTERNATE TEETH TWISTED
IN OPPOSITE DIRECTIONS
B
A
A
B
A
B
A
B
Nameplates
.110 (2.8) DIA. .071 (1.8) DIA.
.126
(3.2) .126
(3.2)
.181
(4.6) .
181
(4.
6)
.098 ± .01
(2.5 ± 0.3)
.154 ± .01
(3.9 ± 0.3)
Option A
.250 QC
Straight
Option C
.250 QC
45°
Option D
.250 QC
90°
Option E
.250 QC/PCB
270°
Option B
.250 QC
90 °
Option F or I
.250 QC/PCB
270 °
Termination Options
Knurled Nut Hex Nut
Embossed
Aluminum
Imprinted Aluminum
(Either Silver on Black
or Black on Silver)
Option G
.250 QC Straight
(small hole)
.110 (2.8) DIA. .071 (1.8) DIA.
.126
(3.2) .126
(3.2)
.181
(4.6) .181
(4.6)
.098 ± .01
(2.5 ± 0.3)
.154 ± .01
(3.9 ± 0.3)
Mounting Hardware Dimensions
Mounting Hardware Ordering Information
Dimension Bushing Plastic Integrated Plastic Metal Metal Lockwasher
Code Diameter Knurled Nut Knurled Nut w/Holes Knurled Nut Hex Nut
3/8” .74 (18.8) – .56 (14.2) .55 (14.0) .49 (12.5)
A M11 .74 (18.8) .74 (18.8) .59 (15.0) .55 (14.0) .587 (14.9)
M12 – – .59 (15.0) .55 (14.0) .626 (15.9)
3/8” .126 (3.2) – .079 (2.0) .079 (2.0) .02 (.5)
B M11 .126 (3.2) .13 (3.3) .102 (2.6) .118 (3.0) .02 (.5)
M12 – – .102 (2.6) .079 (2.0) .02 (.5)
Mounting Bushing Mounting Bushing Plastic Integrated Plastic Metal Metal Lockwasher
Material Code Knurled Nut Knurled Nut w/Holes Knurled Nut Hex Nut
Plastic 1 (M11) – 1423696-8 2-1423696-2 – –
2 (3/8”) – 1423696-2 – – –
5 (M11) – – 1423696-4 1423696-6 1-1423696-2
Metal 6 (3/8”) – – 1-1423696-0 1423696-3 1-1423696-1
7 (M12) – – 1423696-5 1423696-7 1-1423696-3
8 (3/8”) – – 1-1423696-0 1423696-3 1-1423696-1
A
B
2 X .059 DIA.
(1.5)
84° 56°
ALTERNATE TEETH TWISTED
IN OPPOSITE DIRECTIONS
B
A
A
B
A
B
A
B
Integrated Knurled Nut
with Small Holes
Lockwasher
Mounting Hardware Options
.110 (2.8) DIA. .071 (1.8) DIA.
.126
(3.2) .126
(3.2)
.181
(4.6) .181
(4.6)
.098 ± .01
(2.5 ± 0.3)
.154 ± .01
(3.9 ± 0.3)
Option H
.250 QC Straight
with #8-32 Load
Term. Bent 90°
Optional Bottom Marking of Rating
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
TE Connectivity:
W57-XC6F4B10-10 W57-XB1A4B11-10 W57-XJ2A22B10-3M W57-XJ2A22B10-20M W57-XJ2A22B10-10M W57-
XJ2A22B10-7M W57-XB1D7B20-15 W57-XB7A4A10-8 W57-XJ2A7B10-5M W57-XI1F8B10-20 W57-XH1I8B20-15
W57-XC1I8B20-20 W57-XA1A8B10-15 W57-XB1A5A10-10 W57-XB1A5A10-15 W57-XB1A5A10-20 W57-
XB1A5A10-5 W57-XG1A12A10-20
