Catalog 1308242
Issued 4-15 (PDF Rev. 04-15)
Potter & Brumfield
W57
series
Compact, Push To Reset Only
P&B Thermal Circuit Breaker
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.
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.
Typical Resistance vs. Current Rating @ +25°C
Current
Rating
in Amps
3.0
4.0
5.0
6.0
7.0
Typical
Resistance
in Ohms
0.083
0.062
0.050
0.042
0.036
Current
Rating
in Amps
8.0
10.0
12.0
15.0
20.0
Typical
Resistance
in Ohms
0.031
0.025
0.021
0.017
0.012
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.
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).
Time vs. Current Trip Curve @ +25°C
1000
900
800
Load Current As A Percent
Of Breaker Rating
700
600
500
400
300
200
100
0
.1
1
10
100
Time In Seconds
1000
10,000
135
Outline Dimensions
Overload
100%
135%
200%
300%
400%
500%
600%
800%
1000%
Trip Times
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.
.465
(11.8)
.889
(22.6)
.457
(11.6)
1.15 .689
(29.2) (17.5)
.303
(7.7)
SEE TERMINAL DRAWINGS
FOR DETAIL
.031 .102
(.8) (2.6)
.575
(14.6)
SEE MOUNTING
BUSHING AND
MOUNTING HARDWARE
DRAWINGS FOR DETAIL
Optional Protective Boot
Silicone rubber boot is bonded to integral alumimum nut.
Ambient Compensation Table
Ambient
Temperature
in °C
-10
0
10
20
25
30
40
50
60
Revised 04-15
www.te.com
Rating Correction Factor
3-4A Models
.70
.75
.82
.90
1.00
1.10
1.25
1.61
2.15
5-20A Models
.77
.85
.90
.95
1.00
1.05
1.15
1.25
1.40
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.
.63 DIA.
(16.0)
.622
(15.8)
1-1423696-5
Black boot for W57 with
3/8”-24 bushing.
.70 DIA.
(17.8)
.799
(20.3)
1-1423696-6
Clear boot for W57 with
M11 X 1.0 bushing.
Dimensionsareininchesover
(millimeters)unlessotherwise
specified.
Dimensions are shown for reference
purposes only. Specifications and
availability subject to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-1106-0803
SouthAmerica:55-11-2103-6000
Hong Kong: 852-2735-1628
1
Japan: 81-44-844-8013
UK: 44-8706-080208
Catalog 1308242
Issued 4-15 (PDF Rev. 04-15)
Potter & Brumfield
Ordering Information
Typical Part No.
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
B = White, red rate marking (vertical)
C = White, black rate marking (vertical)
D = Black, plain, no rate marking
E = Black, white rate marking (horizontal)
F = White, red rate marking (horizontal)
G = White, black rate marking (horizontal)
H = Black, white rate marking (vertical)
I = Red, plain, no rate marking
J = Black, no rate marking on button,
white rate marking on bottom of
case between terminals.
>
W
57
-X
B
1
A
4
A
1
0
-4
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
6 = Metal hex nut
12 = Metal knurled nut
15 = 2 metal hex nuts, metal lockwasher
18 = Metal hex nut, metal lockwasher
8. Mounting Hardware Packaging:
A = Assembled to bushing
9. Maximum Operating Voltage (AC):
1 = 250VAC
2 = 125VAC/50VDC
10. Nameplate:
0 = None
1 = Embossed aluminum
6
7
8
2 = Silver color printing on black color
10
12
15
20†
3 = Black color printing on silver color
†Not VDE
7 = Plastic knurled nut
8 = Plastic knurled nut with small hole
22 = Plastic knurled nut, metal lockwasher
99 = None
B = Bulk unassembled C = No mounting hardware.
11. Specify Amp Rating:
3†
4†
5
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-XB1A4A10-10
ORDERING NOTE:
W57-XB1A4A10-15
W57-XB1A4A10-20
W57-XB1A7A10-5
W57-XB1A7A10-10
W57-XB1A7A10-15
W57-XB1A7A10-20
Mounting hardware can be ordered separately. Some options are subject to extended leadtimes and significant minimum order quantities.
Mounting Bushings and Recommended Panel Cutouts
.059
(1.5)
.441+.008, -.0
(11.2+.2, -.0)
.386
(9.8)
.378
(9.6)
.394+.008, -.0
(10.0+.2, -.0)
.394
(10.0)
.043
(1.1)
.338
(8.6)
.346 +.008, -.0
(8.8 +.2, -.0)
.382 +.008, -.0
(9.7 +.2, -.0)
.630±.005
(16±.13)
.543±.005
(13.8±.13)
Option 1 – M11 X 1.0 Thread
.059
(1.5)
.441+.008, -.0
(11.2+.2, -.0)
.386
(9.8)
.378
(9.6)
.394+.008, -.0
(10.0+.2, -.0)
Option 2 & 6 – 3/8” - 24UNF Thread
.059
(1.5)
.480 +.008, -.0
(12.2 +.2, -.0)
.425
(10.8)
.378
(9.6)
.433 +.008, -.0
(11.0 +.2, -.0)
.394
(10.0)
Option 4 – Snap In Option
.043
(1.1)
.382 +.008, -.0
(9.7 +.2, -.0)
.303
(7.7)
.311 +.008, -.0
(7.9 +.2, -.0)
Option 5 – M11 X 1.0 Thread
Option 7 – M12 X 1.0 Thread
Dimensions are shown for reference
purposes only. Specifications and
availability subject to change.
Option 8 – 3/8” - 24UNF Thread
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-1106-0803
SouthAmerica:55-11-2103-6000
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-8706-080208
2
Revised 04-15
www.te.com
Dimensionsareininchesover
(millimeters)unlessotherwise
specified.
Catalog 1308242
Issued 4-15 (PDF Rev. 04-15)
Potter & Brumfield
Termination Options
. .
126126
3.
( 2) 2)
3. (
. . ± .± .
15415401 01
.
154 ± .
01 . . ± .± .
09809801 01
.
098 ± .
01
.
( 9( 9 ±126 . .
3. 3.0. 0. 126126 . (. 9 ± 0.
± 3) 3)
181181 3) ( 5( 5 ± 181 . .
3.
2. ± 3) 3)
. 2.0..0. 181181 . ( 5( D8)3)A. .
126
2. ± A.
( 2)( 2) 2) ( 6) 6)
3. 3. (
4.
4. (
. 110 2.0. I 181 .071071 (D 8)D I
110 ( 8) I D
2.
3.
( 6)( 6) 6)
4. 4. (
2.8) A.
4.
( 2)
3.
( 6) . .(1. 1.I A.
4. 110 ( 8) DIA.
.
071 ( 8)D I
1.
A.
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 °
Option G
.250 QC Straight
(small hole)
Option H
.250 QC Straight
with #8-32 Load
Term. Bent 90°
Mounting Hardware Options
A A
A
A
A
2 X .059 DIA.
(1.5)
B B
84°
B
56°
A
Optional Bottom Marking of Rating
ALTERNATE TEETH TWISTEDALTERNATE TEETH TWISTED
A
IN OPPOSITE DIRECTIONS IN OPPOSITE DIRECTIONS
2 X .059 DIA.
(1.5)
84°
B
56°
A
B
B
A
B
B
Knurled Nut
Hex Nut
Integrated Knurled Nut
with Small Holes
Lockwasher
Mounting Hardware Dimensions
Dimension
Code
Bushing
Diameter
3/8”
A
M11
M12
3/8”
B
M11
M12
Plastic
Knurled Nut
.74 (18.8)
.74 (18.8)
–
.126 (3.2)
.126 (3.2)
–
Integrated Plastic
Knurled Nut w/Holes
–
.74 (18.8)
–
–
.13 (3.3)
–
Metal
Knurled Nut
.56 (14.2)
.59 (15.0)
.59 (15.0)
.079 (2.0)
.102 (2.6)
.102 (2.6)
Metal
Hex Nut
.55 (14.0)
.55 (14.0)
.55 (14.0)
.079 (2.0)
.118 (3.0)
.079 (2.0)
Lockwasher
.49 (12.5)
.587 (14.9)
.626 (15.9)
.02 (.5)
.02 (.5)
.02 (.5)
Mounting Hardware Ordering Information
Mounting Bushing
Material
Plastic
Mounting Bushing
Code
1 (M11)
2 (3/8”)
5 (M11)
Metal
6 (3/8”)
7 (M12)
8 (3/8”)
Plastic
Knurled Nut
–
–
–
–
–
–
Integrated Plastic
Knurled Nut w/Holes
1423696-8
1423696-2
–
–
–
–
Metal
Knurled Nut
2-1423696-2
–
1423696-4
1-1423696-0
1423696-5
1-1423696-0
Metal
Hex Nut
–
–
1423696-6
1423696-3
1423696-7
1423696-3
Lockwasher
–
–
1-1423696-2
1-1423696-1
1-1423696-3
1-1423696-1
Nameplates
.854 DIA.
(21.7)
.945 DIA.
(24.0)
.016 (.4) THICK
.016 (.4) THICK
Embossed
Aluminum
Imprinted Aluminum
(Either Silver on Black
or Black on Silver)
Revised 04-15
www.te.com
Dimensionsareininchesover
(millimeters)unlessotherwise
specified.
Dimensions are shown for reference
purposes only. Specifications and
availability subject to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-1106-0803
SouthAmerica:55-11-2103-6000
Hong Kong: 852-2735-1628
3
Japan: 81-44-844-8013
UK: 44-8706-080208
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