Catalog 1308242
Issued 3-03 (PDF Rev. 08-13)
Potter & Brumfield
W51
series
Rocker-Actuated
Thermal Circuit Breaker/Power Switch
With Optional Indicator Lamp
Features
• Compact, trip-free, rocker-actuated design.
• 5 to 20 amp ratings.
• Provides circuit protection and power switching in a single unit.
• Available with optional indicator lamp.
• Snaps into the same cutout as many common power switches.
• Various color, marking and termination options.
Interrupt Capacity: 1,000 amps in accordance with UL standard 1077.
Resettable Overload Capacity: Ten times rated current.
Switch Endurance Cycling: Typically 6,000 operations at 100% of rating.
Reset Time: 60 seconds.
Agency Approvals
W51 series is UL 1077 Recognized as Supplementary Protectors,
File E69543, for Canada and the United States. Approved to VDE
0642/EN60934 (Circuit Breakers for Equipment) License Number
40017023 (for AC loads only). CCC mark compliant, certificate
2004010307123223.
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/laboratories and review them to ensure the product meets the
requirements for a given application.
Typical Resistance vs. Current Rating @ +25°C
Current
Rating
in Amps
5.0
6.0
7.0
8.0
Typical
Resistance
in Ohms
0.050
0.042
0.036
0.031
Current
Rating
in Amps
10.0
15.0
20.0
Typical
Resistance
in Ohms
0.025
0.017
0.0125
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. * 150% for 5-8A models
Dielectric Strength: 1,500VAC (60 seconds).
Insulation Resistance: 100 megohms.
Maximum Operating Voltages: 50VDC; 125 or 250VAC, 50/60 Hz. (model
dependent).
Mechanical/Environmental Data
Operating Temperature Range: 0°C to +60°C for 10-20A models
0°C to +50°C for 5-8A models
Termination: .250” (6.35mm) quick connects, solder terminals or right angle PC
terminals.
Mounting: Snaps into 1.122 x .531 (28.5 x 13.5) panel cutout.
Approximate Weight: 0.37 oz. (10.5g).
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%
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.
Ambient Compensation Table
Ambient
Temperature
in °C
10
20
25
30
40
50
60
Revised 04-17
www.te.com
Rating Correction Factor
5-8A Models
.80
.90
1.00
1.10
1.25
1.61
10-20A Models
.80
.90
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.
Dimensions are shown for reference
purposes only. Specifications and
availability subject to change.
Recommended Panel Cutout
SUGGESTED
PANEL CUTOUT
1.122
(28.5)
.531
(13.5)
Panel Thickness
W51 series circuit breakers accommodate panel thicknesses
from 0.030 in. to 0.118 in. (0.75 mm - 3.0 mm).
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
112
Dimensionsareininchesover
(millimeters)unlessotherwise
specified.
Catalog 1308242
Issued 3-03 (PDF Rev. 08-13)
Potter & Brumfield
Ordering Information
Typical Part No.
1. Designator:
W = Circuit breaker
2. Series Number:
51 = Switchable, Single Pole, Rocker-Actuated Thermal Model
3. Terminals:
A = Quick connect .250” (6.35mm) straight C = Printed Circuit - right angle
4. Breaker Style & Base Color:
1 = Angular button design (see drawing below), black base color
B = Countoured button design (see drawing below), black base color
5. Rocker Color:
1 = Amber (translucent)
2 = Red (translucent)
3 = Green (translucent)
4 = White (opaque - for use on non-illuminated models)
5 = Black (opaque - for use on non-illuminated models)
6 = Red (opaque - for use on non-illuminated models)
7 = Gray (opaque - for use on non-illuminated models)
8 = Black (opaque) with red (translucent) indicator (only available on model with contoured button)
9 = Black (opaque) with green (translucent) indicator (only available on model with contoured button)
6. Maximum Operating Voltage (AC):
1 = 125VAC
2 = 250VAC
7. Light:
A = Non-illuminated
8. Marking option:
0 = No marking
1 = RESET/OFF printed
9. Specify Amp Rating:
5
6
7
B = Illuminated
2 = RESET/OFF molded (only available on model with contoured button)
>
W
51
-A
1
2
1
B
1
-5
8
10
15
20
Our authorized distributors are more likely to stock the following items for immediate delivery.
W51-A121B1-5
W51-A121B1-10
W51-A121B1-15
W51-A121B1-20
W51-A122B1-5
W51-A122B1-10
W51-A122B1-15
W51-A122B1-20
W51-A152A1-5
W51-A152A1-10
W51-A152A1-15
W51-A152A1-20
ORDERING NOTE: Some options illustrated below are not listed in the “Ordering Information” chart above. Options denoted by “Special” or “Special Order” in their
descriptions are only offered on a special order basis. Other base and button colors and intermediate amp ratings are also available on a special order
basis. All special order items are subject to extended leadtimes and significant minimum order quantities. Your TE sales engineer must consult with
the factory before providing price and availability information regarding items with these options.
Case Styles
Marking Options
For Angular Button Design
(Printed)
For Contoured
Button Design
(Molded)
Standard -
RESET/OFF
Printed on
Bezel
Angular Button
Design
Contoured Button
Design
Standard -
No Marking
Standard -
RESET/OFF
Molded into
bezel
Terminal Types
.374
(9.5)
.098 X .157
(2.5 x 4.0)
.25
(6.35)
.393
(10.0)
.205
(5.2)
.157 X .098
(4.0 x 2.5)
.25
(6.35)
.393
(10.0)
.298
(7.55)
.504
(12.8)
.601
(15.26)
.250
(6.35)
TERMINAL THICKNESS .032
FOR ALL TYPES
(.81)
Special Order -
Solder
Terminal
.66
(16.76)
.156
(3.95)
Standard –
.250 Quick Connect
Terminal
Standard –
Right Angle PC
Terminal
Revised 04-17
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
113
Japan: 81-44-844-8013
UK: 44-8706-080208
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