6-1393250-8

## **POTTER & BRUMFIELD W28 SERIES** 

PUSH TO RESET, FUSEHOLDER-TYPE THERMAL P&B CIRCUIT BREAKER 

## FEATURES 

- Push to reset. 

- Approved to many international standards. 

- Replaces slow blow glass cartridge fuse. 

- Labor-saving snap-in mounting. 

- Button extends for visual trip indication. 

## APPROVALS 

- W28 series is UL 1077 Recognized as Supplementary Protectors, File E69543, CSA Accepted as Supplementary Protectors (Appliance Component Protectors), File LR15734. 

- W28 breakers are VDE approved for use in office equipment (AC loads only) and provides 8mm isolation. 

- 20 amp models do not have VDE approvals at present. 

- CCC mark compliant certificate 2024010307685413 & 20240100307696168 

Note: VDE not available on 20A W28 only. 

Technical data of approved types on request 

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 confirm the product meets the requirements for a given application. 

**POTTER & BRUMFIELD W28 SERIES** THERMAL P&B CIRCUIT BREAKER 

## **ELECTRICAL DATA @ 25°C** 

## **TYPICAL RESISTANCE VS. CURRENT RATING @ +25°C** 

||Will continuously carry 100% of rating<br>3-20 amp models :<br>May trip between 101% and 134%,||**Current Rating**<br>**in Amps**|<br>**Typical**<br>**Resistance**<br>**in Ohms**|**Current**<br>**Rating in**<br>**Amps**|**Typical**<br>**Resistance**<br>**in Ohms**|
|---|---|---|---|---|---|---|
||but must trip at 135% of rating||0.25|14.0|8.0|0.016|
|Calibration|within one hour at +25°C.||||||
||0.25-2 amp models :||0.50|3.55|9.0|0.014|
||May trip between 101% and 174%,||||||
||but must trip at 175% of rating||0.75|2.0|10.0|0.011|
||within one hour at +25°C.||||||
||||1.0|0.89|11.0|0.011|
|Dielectric Strength|Over 1,500 volts RMS.||||||
|Maximum Operating<br>Voltages|<br>32VDC; 250VAC, 50/60Hz.||2.0|0.17|12.0|0.009|
||1,000 amps at 250VAC, 50/60Hz.||3.0|0.069|13.0|0.009|
|Interrupt Capacity|and 32VDC in accordance||||||
||with UL standard 1077.||4.0|0.043|14.0|0.007|
||0.25 - 2 amp models :||||||
|Resettable Overload|Six times rated current||5.0|0.030|16.0|0.007|
|Capacity|3 - 20 amp models :||||||
||Ten times rated current||6.0|0.026|20.0|0.006|
||0.25 - 2 amp models :||||||
||180 seconds max||7.0|0.017|||
|Reset Time|||||||
||3 - 20 amp models :||||||
||30 seconds max||||||



## **MECHANICAL/ENVIRONMENTAL DATA** 

|Termination|.250” (6.35mm) quick connects.<br>Soldering to terminals is<br>not recommended.|
|---|---|
|Mounting|Snaps into panel from front. See<br>Recommended Panel Cutouts.|
|Approximate Weight|0.35 oz. (10g).|



## **TIME VS. CURRENT TRIP CURVE @ +25°C** 

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1000<br>(A) All 3-20 Amp Models (B) All 0.25-2 Amp Models<br>900 Overload Trip Times Overload Trip Times<br>100% No Trip 100% No Trip<br>800 135% Trip in 1 hour 175% Trip in 1 hour<br>200% 2.2-15.0 Sec. 200% 4.5-28.0 Sec.<br>400% 0.55-1.8 Sec. 400% 1.0-6.5 Sec.<br>700 600% 0.27-0.7 Sec. 600% 0.4-4.0 Sec.<br>800% 0.17-0.45 Sec.<br>(A) 1000% 0.12-0.3 Sec.<br>600<br>500<br>400<br>(B)<br>300<br>200<br>175<br>135 100<br>0<br>.1 1 1 0 100 1000<br>Time In Seconds<br>Of Breaker Rating<br>Load Current As A Percent<br>**----- End of picture text -----**<br>


INDUSTRIAL AUTOMATION & ELECTRIFICATION / W28 SERIES 

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**POTTER & BRUMFIELD W28 SERIES** THERMAL P&B CIRCUIT BREAKER 

## **AMBIENT COMPENSATION CHART** 

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**----- Start of picture text -----**<br>
1.40<br>1.30<br>1.20<br>To use this chart: Read up from the ambient temperature to the curve, and<br>1.10 across to find a correction factor. Multiply the breaker rating by the correction<br>factor to determine the compensated rating. Calculate the overloads in terms<br>1.00 of the compensated rating to use the published trip curve.<br>0.90 Do not use these devices outside their specified operating temperature<br>ranges.<br>0.80<br>0.70<br>0.60<br>-20 -10 0 10 20 30 40 50 60<br>Correction Factor<br>**----- End of picture text -----**<br>


**Ambient Temperature In Degrees Centigrade (°C)** 

## **OUTLINE DIMENSIONS** 

## **PUSH-TO-RESET TYPE** 

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**----- Start of picture text -----**<br>
1.535 MAX. .19 .76 MAX.<br>(38.99) (4.83) (19.31)<br>I<br>.54 MAX. .76 MAX.<br>(13.716) (19.31)<br>O<br>.325 MAX.<br>(8.26) AMPRATING<br>.37<br>(9.4)<br>.625 MAX.<br>(15.875)<br>.250 x .032 (6.35 x .813)<br>QUICK CONNECT TERMINALS<br>**----- End of picture text -----**<br>


Notes: 1. Soldering to terminals is not recommended. 2. Recommended Panel Thickness: Style Q: .032” - .062” (.813 mm - 1.574 mm) Style T: .075” - .105” (1.905 mm - 2.667 mm) 

## **RECOMMENDED PANEL CUTOUTS** 

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**----- Start of picture text -----**<br>
.570-.575 .540-.550<br>(14.478-14.605) (13.716-13.970)<br>.625-.635 .625-.635 .625-.635<br>(15.875-16.129) (15.875-16.129) (15.875-16.129)<br>**----- End of picture text -----**<br>


INDUSTRIAL AUTOMATION & ELECTRIFICATION / W28 SERIES 

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## **ORDERING INFORMATION** 

|**Typical Part Numbere**<br>**W   28   -X   Q   1   A   -5**<br>**Designator**<br>**W**<br>Circuit breaker<br>**Series Number**<br>**28**<br>Single Pole Fuseholder Type<br>**Circuit Function**<br>**X**<br>Series Trip, Push-to-Reset Button<br>**Terminal Type and Mounting**<br>**Q**<br>.250” (6.35mm) Quick Connect will<br>mount in .032”-.062” (.813mm –<br>1.574mm) thick panel.<br>**T**<br>.250” (6.35mm) Quick Connect will<br>mount in .075”-.105” (1.905mm –<br>2.667mm) thick panel.|**Typical Part Numbere**<br>**W   28   -X   Q   1   A   -5**<br>**Designator**<br>**W**<br>Circuit breaker<br>**Series Number**<br>**28**<br>Single Pole Fuseholder Type<br>**Circuit Function**<br>**X**<br>Series Trip, Push-to-Reset Button<br>**Terminal Type and Mounting**<br>**Q**<br>.250” (6.35mm) Quick Connect will<br>mount in .032”-.062” (.813mm –<br>1.574mm) thick panel.<br>**T**<br>.250” (6.35mm) Quick Connect will<br>mount in .075”-.105” (1.905mm –<br>2.667mm) thick panel.|**Typical Part Numbere**<br>**W   28   -X   Q   1   A   -5**|**Typical Part Numbere**<br>**W   28   -X   Q   1   A   -5**|**Typical Part Numbere**<br>**W   28   -X   Q   1   A   -5**|**Typical Part Numbere**<br>**W   28   -X   Q   1   A   -5**|**Amp Rating**|**Amp Rating**||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
||||||||||||||
|||||||**0.25**|**0.5**|**0.75**|**1**|**2**|**3**|**4**|
|||||||**5**|**6**|**7**|**8**|**9**|**10**|**11**|
|||||||**12**|**13**|**14**|**16**|**20**|||
|||||||**Button C**|**olor**||||||
|||||||**A**|||Black||||
|||||||**B**|||Red||||
|||||||**Bezel Color**|||||||
|**Q**|.250” (6.35mm) Quick Connect will<br>mount in .032”-.062” (.813mm –<br>1.574mm) thick panel.|||||**1**|Black with White Rate||||Marking||
|||||||**2**|Red with Black Rate Marking||||||
|||||||**11**|Black with No Rate Marking||||||
|**T**|.250” (6.35mm) Quick Connect will<br>mount in .075”-.105” (1.905mm –<br>2.667mm) thick panel.||||||||||||
|||||||**21**|Red with No Rate Marking||||||
|||||||**B**|Black with White “Reset” Marked<br>On Bezel (No Rate Marking)||||||
||||||||||||||



**Note:** All standard part numbers in this series are RoHS compliant. 

## **STOCK ITEMS – AUTHORIZED DISTRIBUTORS ARE MORE LIKELY TO STOCK THE FOLLOWING ITEMS.** 

W28-XQ1A-0.25 W28-XQ1A-1 W28-XQ1A-4 W28-XQ1A-7 W28-XQ1A-12 W28-XT1A-10 W28-XQ1A-0.50   W28-XQ1A-2 W28-XQ1A-5 W28-XQ1A-8 W28-XQ1A-15 W28-XT1A-12 W28-XQ1A-0.75 W28-XQ1A-3 W28-XQ1A-6 W28-XQ1A-10 W28-XQ1A-20 

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06/25 ED 

INDUSTRIAL AUTOMATION & ELECTRIFICATION / W28 SERIES