1

Catalog 1308242

Issued 4-15 (PDF Rev. 04-15)

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

Potter & Brumfield

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

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.

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)