Catalog 1308242
Potter & Brumfield
Issued 4-15 (PDF Rev. 04-15)
W57 series
Compact, Push To Reset Only
P&B Thermal Circuit Breaker
Features Insulation Resistance: 100 megohms.
Maximum Operating Voltages: 50VDC; 250VAC, 50/60 Hz.
New, compact design.
Interrupt Capacity: 1,000 amps in accordance with UL standard 1077.
3 to 20 amp ratings.
Cannot be manually tripped. Resettable Overload Capacity: Ten times rated current.
Button extends for visual trip indication. Reset Time: 60 seconds.
Push button to reset breaker.
Numerous mounting and termination options.
Optional bottom marking of amperage rating.
Typical Resistance vs. Current Rating @ +25C
Agency Approvals Current Typical Current Typical
Rating Resistance Rating Resistance
W57 series is UL1077 Recognized as Supplementary Protectors,
in Amps in Ohms in Amps in Ohms
File E69543, for Canada and the United States. Available models
meet Ignition Protection requirements in accordance with UL1500. 3.0 0.083 8.0 0.031
Approved to VDE 0642/EN60934 (Circuit Breakers for Equipment) 4.0 0.062 10.0 0.025
License Number 40007874 (excludes models rated 3-4A and >15A). 5.0 0.050 12.0 0.021
CCC mark compliant, certificate 2004010307123217. 6.0 0.042 15.0 0.017
7.0 0.036 20.0 0.012
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.
Mechanical/Environmental Data
Electrical Data @ 25C
Operating Temperature Range: 0C to +60C.
Calibration: Will continuously carry 100% of rating.
Termination: .250 (6.35mm) quick connects.
May trip between 101% and 134%, but must trip at 135% of Mounting: Various options. See Ordering Information and drawings.
rating within one hour at +25C.
Approximate Weight: 0.5 oz. (14.3g).
Dielectric Strength: 1,500VAC (60 seconds).
Outline Dimensions
Time vs. Current Trip Curve @ +25C
1000
.465 .889
.457
Overload Trip Times
(11.8) (22.6)
(11.6)
100% No Trip
900
135% Trip in 1 hour
200% 4.0 - 40.0 Sec.
800
300% 1.2 - 12.0 Sec.
.303
1.15 .689
400% 0.6 - 5.0 Sec.
(7.7)
(29.2) (17.5)
700
500% 0.4 - 2.8 Sec.
600% 0.3 - 1.8 Sec.
600
800% 0.18 - 0.9 Sec.
1000% 0.12 - 0.7 Sec.
SEE MOUNTING
500
SEE TERMINAL DRAWINGS
BUSHING AND
FOR DETAIL
MOUNTING HARDWARE
400
.031.102 DRAWINGS FOR DETAIL
(.8) (2.6)
300
.575
(14.6)
200
135
100
0 Optional Protective Boot
.1 110100 1000 10,000
Silicone rubber boot is bonded to integral alumimum nut.
Time In Seconds
Ambient Compensation Table
1-1423696-5
.63 DIA.
Black boot for W57 with
(16.0)
Ambient Rating Correction Factor
3/8-24 bushing.
Temperature
To use this chart: Divide the breaker
.622
in C 3-4A Models 5-20A Models
rating by the correction factor to
(15.8)
determine the compensated rating.
-10 .70 .77
Calculate the overloads in terms of
0 .75 .85
the compensated rating to use the
10 .82 .90
published trip curve.
20 .90 .95
Do not use these devices outside 1-1423696-6
25 1.00 1.00
.70 DIA.
their specified operating temperature Clear boot for W57 with
30 1.10 1.05
(17.8)
ranges. M11 X 1.0 bushing.
40 1.25 1.15
50 1.61 1.25
.799
60 2.15 1.40
(20.3)
Revised 04-15 Dimensions are in inches over Dimensions are shown for reference South America: 55-11-2103-6000
USA: 1-800-522-6752
www.te.com (millimeters) unless otherwise purposes only. Specifications and Hong Kong: 852-2735-1628
Canada: 1-905-470-4425
1
specified. availability subject to change. Japan: 81-44-844-8013
Mexico: 01-800-733-8926
UK: 44-8706-080208
C. America: 52-55-1106-0803
Load Current As A Percent
Of Breaker RatingCatalog 1308242
Potter & Brumfield
Issued 4-15 (PDF Rev. 04-15)
Ordering Information
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, 3/8x24 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, 3/8x24 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, 3/8x24 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.
W57-XB1A4A10-5 W57-XB1A4A10-15 W57-XB1A7A10-5 W57-XB1A7A10-15
W57-XB1A4A10-10 W57-XB1A4A10-20 W57-XB1A7A10-10 W57-XB1A7A10-20
ORDERING NOTE: Mounting hardware can be ordered separately. Some options are subject to extended leadtimes and significant minimum order quantities.
Mounting Bushings and Recommended Panel Cutouts
.338
.630.005
.346 +.008, -.0
(8.6)
.441+.008, -.0
(16.13)
(8.8 +.2, -.0)
.059 .043
(11.2+.2, -.0)
(1.5)
(1.1)
.543.005
.394+.008, -.0
.386
.382 +.008, -.0
(13.8.13)
(10.0+.2, -.0)
(9.8) (9.7 +.2, -.0)
.378
.394
(9.6)
(10.0)
Option 1 M11 X 1.0 Thread Option 2 & 6 3/8 - 24UNF Thread
Option 4 Snap In Option
.441+.008, -.0
.480 +.008, -.0
.382 +.008, -.0
.059
(11.2+.2, -.0) (12.2 +.2, -.0)
.059 .043 (9.7 +.2, -.0)
(1.5)
(1.5) (1.1)
.433 +.008, -.0
.394+.008, -.0 .425
.386 .303 .311 +.008, -.0
(11.0 +.2, -.0)
(10.0+.2, -.0) (10.8)
(9.8) (7.7) (7.9 +.2, -.0)
.378 .378
.394
(9.6)
(9.6)
(10.0)
Option 8 3/8 - 24UNF Thread
Option 5 M11 X 1.0 Thread Option 7 M12 X 1.0 Thread
Revised 04-15 Dimensions are in inches over Dimensions are shown for reference South America: 55-11-2103-6000
USA: 1-800-522-6752
www.te.com (millimeters) unless otherwise purposes only. Specifications and Hong Kong: 852-2735-1628
Canada: 1-905-470-4425
2
specified. availability subject to change. Japan: 81-44-844-8013
Mexico: 01-800-733-8926
UK: 44-8706-080208
C. America: 52-55-1106-0803