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 Resettable Overload Capacity: Six times rated current for 0.25 through • Push to reset. 2 amp models. Ten times rated current • Approved to many international standards. for 3 through 20 amp models. • Replaces slow blow glass cartridge fuse. Reset Time: 180 seconds max. for 0.25 through 2 amp models. 5 to 30 • Labor-saving snap-in mounting. seconds for 3 through 20 amp models. • Button extends for visual trip indication. Agency Approvals Typical Resistance vs. Current Rating @ +25°C W28 series is UL 1077 Recognized as Supplementary Protectors, File E69543, and CSA Accepted as Supplementary Protectors (Appliance Component Current Typical Current Typical Protectors), File LR15734. W28 breakers are VDE approved for use in office Rating Resistance Rating Resistance equipment (AC loads only) and provides 8mm isolation. 16 amp and 20 amp in Amps in Ohms in Amps in Ohms models do not have VDE approvals at present. CCC mark compliant, certificate 2004010307135992. 0.25 14.0 8.0 0.016 0.50 3.55 9.0 0.014 Users should thoroughly review the technical data before selecting a product part 0.75 2.0 10.0 0.011 number. It is recommended that users also seek out the pertinent approvals files 1.0 0.89 11.0 0.01 of the agencies/laboratories and review them to confirm the product meets the 2.0 0.17 12.0 0.009 requirements for a given application. 3.0 0.069 13.0 0.009 4.0 0.043 14.0 0.007 5.0 0.030 15.0 0.007 6.0 0.026 16.0 0.007 7.0 0.017 20.0 0.006 Electrical Data @ 25°C 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. Mechanical/Environmental Data 0.25-2 amp models – may trip between 101% and 174%, but must trip at 175% of rating within one hour at +25°C. Termination: .250” (6.35mm) quick connects. Soldering to terminals is Dielectric Strength: Over 1,500 volts RMS. not recommended. Maximum Operating Voltages: 32VDC; 250VAC, 50/60 Hz. Mounting: Snaps into panel from front. See Recommended Interrupt Capacity: 1,000 amps at 250VAC, 50/60 Hz. and 32VDC in Panel Cutouts. accordance with UL standard 1077. Approximate Weight: 0.35 oz. (10g). Time vs. Current Trip Curve @ +25°C Ambient Compensation Chart 1000 1.40 (A) All 3-20 Amp Models (B) All 0.25-2 Amp Models 900 Overload Trip Times Overload Trip Times 1.30 800 110305%% Trip inN 1o h Toruipr 110705%% Trip inN 1o h Toruipr ctor1.20 A Percentating 760000 (A) 1246800000000000%%%%% 0200.01....25271-57-210---510.04....08753 SSSSSeeeeeccccc..... 246000000%%% 4.105..-042--864...050 SSSeeeccc... orrection Fa110...109000 d Current As Of Breaker R 543000000 (B) C000A...m876000bien–t2 T0em–1p0era0tur1e0 In D20egr3e0es C40ent5ig0rad6e0 (°C) a o L 200 To use this chart: Read up from the ambient tem- 175 perature to the curve, and across to find a correction 135100 factor. Multiply the breaker rating by the correc- tion factor to determine the compensated rating. 0 Calculate the overloads in terms of the compensated .1 1 10 100 1000 rating to use the published trip curve. Time In Seconds Do not use these devices outside their specified operating temperature ranges. Revised 11-15 Dimensions are in inches over Dimensions are shown for reference USA: 1-800-522-6752 South America: 55-11-2103-6000 www.te.com (millimeters) unless otherwise purposes only. Specifications and avail- Canada: 1-905-470-4425 Hong Kong: 852-2735-1628 110 specified. ability subject to change. Mexico: 01-800-733-8926 Japan: 81-44-844-8013 C. America: 52-55-1106-0803 UK: 44-8706-080208

Catalog 1308242 Issued 3-03 (PDF Rev. 11-15) Potter & Brumfield Ordering Information > W 28 -X Q 1 A -5 Typical Part Number 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 1.535 MAX. .19 .76 MAX. (38.99) (4.83) (19.31) I .54 MAX. .76 MAX. (13.716) (19.31) O .325 MAX. .37 (8.26) AMP RATING (9.4) .625 MAX. (15.875) .250 x .032 (6.35 x .813) QUICK CONNECT TERMINALS 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 For panels greater than .105” (2.67) thickness .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 infor- mation in this document , TE does not guarantee that it is error-free, nor does .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. 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. Revised 11-15 Dimensions are in inches over Dimensions are shown for reference USA: 1-800-522-6752 South America: 55-11-2103-6000 www.te.com (millimeters) unless otherwise purposes only. Specifications and avail- Canada: 1-905-470-4425 Hong Kong: 852-2735-1628 specified. ability subject to change. Mexico: 01-800-733-8926 Japan: 81-44-844-8013 111 C. America: 52-55-1106-0803 UK: 44-8706-080208