Catalog 1308242
Issued 4-15 (PDF Rev. 04-15)
Potter & Brumfield
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.
Resettable Overload Capacity: Ten times rated current.
Reset Time: 60 seconds.
• 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.
Typical Resistance vs. Current Rating @ +25°C
Current
Rating
in Amps
Typical
Resistance
in Ohms
Current
Rating
in Amps
Typical
Resistance
in Ohms
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.
3.0
4.0
5.0
6.0
7.0
0.083
0.062
0.050
0.042
0.036
8.0
10.0
12.0
15.0
20.0
0.031
0.025
0.021
0.017
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
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).
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).
Outline Dimensions
Time vs. Current Trip Curve @ +25°C
1000
.465
(11.8)
.889
(22.6)
.457
(11.6)
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.
900
800
700
600
500
400
300
200
.303
(7.7)
.689
1.15
(17.5)
(29.2)
SEE MOUNTING
BUSHING AND
MOUNTING HARDWARE
DRAWINGS FOR DETAIL
SEE TERMINAL DRAWINGS
FOR DETAIL
.031 .102
(.8) (2.6)
.575
(14.6)
135
100
Optional Protective Boot
Silicone rubber boot is bonded to integral alumimum nut.
0
10,000
.1
1
10
100
1000
Time In Seconds
Ambient Compensation Table
1-1423696-5
.63 DIA.
(16.0)
Black boot for W57 with
Ambient
Temperature
in °C
Rating Correction Factor
3/8”-24 bushing.
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.
.622
(15.8)
3-4A Models
5-20A Models
-10
0
.70
.75
.82
.77
.85
.90
10
20
25
30
40
50
60
.90
.95
1-1423696-6
1.00
1.10
1.25
1.61
2.15
1.00
1.05
1.15
1.25
1.40
.70DIA.
(17.8)
Clear boot for W57 with
M11 X 1.0 bushing.
.799
(20.3)
Revised 04-15
www.te.com
Dimensionsareininchesover
(millimeters)unlessotherwise
specified.
Dimensionsareshownforreference
purposes only. Specifications and
availability subject to change.
SouthAmerica: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
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