1-1393250-9

Catalog 1308242 Issued 3-03 (PDF Rev. 11-15) 

Potter & Brumfield 

## W28 series 

## Push to Reset Fuseholder-Type Thermal P&B Circuit Breaker 

Note: VDE not available on 16A and 20A W28 only. 

## Features 

- Push to reset. 

- Approved to many international standards. 

- Replaces slow blow glass cartridge fuse. 

- Labor-saving snap-in mounting. 

Resettable Overload Capacity:  Six times rated current for 0.25 through 2 amp models. Ten times rated current for 3 through 20 amp models. Reset Time:  180 seconds max. for 0.25 through 2 amp models. 5 to 30 seconds for 3 through 20 amp models. 

- Button extends for visual trip indication. 

## Agency Approvals 

W28 series is UL 1077 Recognized as Supplementary Protectors, File E69543, and 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. 16 amp and 20 amp models do not have VDE approvals at present. CCC mark compliant, certificate 2004010307135992. 

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. 

## Electrical Data @ 25°C 

## Typical Resistance vs. Current Rating @ +25°C 

|Current<br>Rating<br>in Amps<br>0.25<br>0.50<br>0.75<br>1.0<br>2.0<br>3.0<br>4.0<br>5.0<br>6.0<br>7.0|Typical<br>Resistance<br>in Ohms<br>14.0<br>3.55<br>2.0<br>0.89<br>0.17<br>0.069<br>0.043<br>0.030<br>0.026<br>0.017|Current<br>Rating<br>in Amps<br>8.0<br>9.0<br>10.0<br>11.0<br>12.0<br>13.0<br>14.0<br>15.0<br>16.0<br>20.0|Typical<br>Resistance<br>in Ohms<br>0.016<br>0.014<br>0.011<br>0.01<br>0.009<br>0.009<br>0.007<br>0.007<br>0.007<br>0.006|
|---|---|---|---|



Calibration:  Will continuously carry 100% of rating. 

3-20 amp models – may trip between 101% and 134%, but must trip at 135% of rating within one hour at +25°C. 0.25-2 amp models – may trip between 101% and 174%, but must trip at 175% of rating within one hour at +25°C. 

Dielectric Strength:  Over 1,500 volts RMS. 

Maximum Operating Voltages:  32VDC; 250VAC, 50/60 Hz. Interrupt Capacity:  1,000 amps at 250VAC, 50/60 Hz. and 32VDC in accordance with UL standard 1077. 

## Mechanical/Environmental Data 

Termination:  .250” (6.35mm) quick connects. Soldering to terminals is not recommended. 

Mounting:  Snaps into panel from front. See 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>Be 100% No Trip 100% No Trip<br>800 P\ LATHE EET 135%200% 2.2-15.0 Sec.Trip in 1 hour 175%200% 4.5-28.0 Sec.Trip in 1 hour<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>| (A) ll 1000%800% 0.17-0.45 Sec.0.12-0.3 Sec.<br>600<br>Th<br>500<br>PL KENT PY<br>400<br>Po ENGR (B) PPP<br>300<br>a<br>200<br>175 ee eia SS ||el<br>135<br>100 P| ye SH a<br>0 ee<br>.1 1 a 10 | 100 ell 1000<br>Time In Seconds<br>Of Breaker Rating<br>Load Current As A Percent<br>**----- End of picture text -----**<br>


Ambient Compensation Chart 

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1.40<br>1.30<br>1.20 BNE<br>1.10 F ASECPEEE<br>N EE<br>1.00<br>0.90 SEeERNEEEEN\<br>0.80 HEPES<br>0.70<br>FCEEEEEP<br>0.60<br>POPE –20 –10 0  EEE 10 20 30 40 50 NES 60<br>Am bient Tem perature In Degrees Centigrade (°C)<br>Correction Factor<br>**----- End of picture text -----**<br>


To use this chart: Read up from the ambient temperature to the curve, and across to find a correction factor. Multiply 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. 

USA: 1-800-522-6752 South America: 55-11-2103-6000 Canada: 1-905-470-4425 Hong Kong: 852-2735-1628 Mexico: 01-800-733-8926 Japan: 81-44-844-8013 C. America: 52-55-1106-0803 UK: 44-8706-080208 

Revised 11-15 Dimensions are in inches over Dimensions are shown for reference www.te.com (millimeters) unless otherwise purposes only. Specifications and availspecified. ability subject to change. 

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Catalog 1308242 Issued 3-03 (PDF Rev. 11-15) Potter & Brumfield ~~Ordering Information~~ Typical Part Number > W 28 -X Q 1 A -5 1. Designator: W = Circuit breaker 2. Series Number: 28 = Single Pole Fuseholder Type 3. Circuit Function: X = Series Trip, Push-to-Reset Button 4. Terminal Type and Mounting: Q = .250” (6.35mm) Quick Connect will mount in .032”-.062” (.813mm – 1.574mm) thick panel. T = .250” (6.35mm) Quick Connect will mount in .075”-.105” (1.905mm – 2.667mm) thick panel. For panel thicknesses other than above, order “Q” type and 55-025B Internal Tooth Push-On Lockwasher. 5. Bezel Color: 1 = Black with White Rate Marking 11 = Black with No Rate Marking 2 = Red with Black Rate Marking 21 = Red with No Rate Marking B = Black with White “Reset” Marked On Bezel (No Rate Marking) Consult factory for other bezel colors. 6. Button Color: A = Black B = Red Consult factory for other button colors. 7. Amp Rating: ~~———~~ 0.25 0.75 2 4 6 8 10 12 14 20 0.50 1 3 5 7 9 11 13 16 

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 

Outline Dimensions Push-to-Reset Type 

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1.535 M AX. .19 .76 M AX.<br>(38.99) (4.83) (19.31)<br>I<br>.54 M AX. .76 M AX.<br>(13.716) (19.31)<br>O<br>.325 M AX.<br>=a .37 (8.26) EN AM P RATING<br>(9.4)<br>.625 M AX.<br>(15.875) Ss .250 x .032 (6.35 x .813) og<br>Q UICK CO NNECT TERM INALS<br>**----- End of picture text -----**<br>


Optional Internal Tooth Push-On Lockwasher Notes: 1. Soldering to terminals is not recommended. For panels greater than .105 (2.67) thickness         55-025B 2. Recommended Panel Thickness: Style Q: .032” - .062” (.813 mm - 1.574 mm) Style T: .075” - .105” (1.905 mm - 2.667 mm) 3.  Internal tooth push-on washer available for panel thickness not covered above. Part No. 55-025B. 55-025B .970 DIA. INTERNAL TOOTH (25.64) PUSH-ON LOCKWASHER Recommended Panel Cutouts ~~——— ©~~ .570-.575 .540-.550 (14.478-14.605) (13.716-13.970) Disclaimer While TE has made every reasonable effort to ensure the accuracy of the information in this document , TE does not guarantee that it is error-free, nor does ~~OO~~ .625-.635 .625-.635 .625-.635 TE make any other representation, warranty or guarantee that the information is (15.875-16.129) (15.875-16.129) (15.875-16.129) accurate, correct, reliable or current. 

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55-025B<br>.970 DIA. INTERNAL TOOTH<br>(25.64) PUSH-ON LOCKWASHER<br>For panels greater than .105” (2.67) thickness<br>**----- End of picture text -----**<br>


While TE has made every reasonable effort to ensure the accuracy of the information in this document , TE does not guarantee that it is error-free, nor does TE make any other representation, warranty or guarantee that the information is accurate, correct, reliable or current. 

TE reserves the right to make any adjustments to the information contained herein at any time without notice. TE expressly disclaims all implied warranties regarding the information contained herein, including, but not limited to, any implied warranties of merchantability or fitness for a particular purpose. 

The dimensions in this catalog are for reference purposes only and are subject to change without notice. Specifications are subject to change without notice. Consult TE for the latest dimensions and design specifications. 

USA: 1-800-522-6752 South America: 55-11-2103-6000 Canada: 1-905-470-4425 Hong Kong: 852-2735-1628 Mexico: 01-800-733-8926 Japan: 81-44-844-8013 C. America: 52-55-1106-0803 UK: 44-8706-080208 

Dimensions are shown for reference purposes only. Specifications and availability subject to change. 

Revised 11-15 Dimensions are in inches over www.te.com (millimeters) unless otherwise specified. 

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