Catalog 1308242
Potter & Brumfield
Issued 3-03 (PDF Rev. 11-15)
W28 series
Push to Reset
Fuseholder-Type
Thermal P&B Circuit Breaker
Note: VDE not available on 16A and 20A W28 only.
Resettable Overload Capacity: Six times rated current for 0.25 through
Features
2 amp models. Ten times rated current
Push to reset.
for 3 through 20 amp models.
Approved to many international standards.
Reset Time: 180 seconds max. for 0.25 through 2 amp models. 5 to 30
Replaces slow blow glass cartridge fuse.
seconds for 3 through 20 amp models.
Labor-saving snap-in mounting.
Button extends for visual trip indication.
Agency Approvals
Typical Resistance vs. Current Rating @ +25C
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
0.25 14.0 8.0 0.016
2004010307135992.
0.50 3.55 9.0 0.014
0.75 2.0 10.0 0.011
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 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 @ 25C
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 +25C.
Mechanical/Environmental Data
0.25-2 amp models may trip between 101% and 174%, but
Termination: .250 (6.35mm) quick connects. Soldering to terminals is
must trip at 175% of rating within one hour at +25C.
notrecommended.
Dielectric Strength: Over 1,500 volts RMS.
Mounting: Snaps into panel from front. See Recommended
Maximum Operating Voltages: 32VDC; 250VAC, 50/60 Hz.
PanelCutouts.
Interrupt Capacity: 1,000 amps at 250VAC, 50/60 Hz. and 32VDC in
Approximate Weight: 0.35 oz. (10g).
accordance with UL standard 1077.
Ambient Compensation Chart
Time vs. Current Trip Curve @ +25C
1000
1.40
(A) All 3-20 Amp Models (B) All 0.25-2 Amp Models
1.30
Overload Trip Times Overload Trip Times
900
100% No Trip 100% No Trip
1.20
135% Trip in 1 hour 175% Trip in 1 hour
800
200% 2.2-15.0 Sec. 200% 4.5-28.0 Sec.
1.10
400% 0.55-1.8 Sec. 400% 1.0-6.5 Sec.
600% 0.27-0.7 Sec. 600% 0.4-4.0 Sec.
700 1.00
800% 0.17-0.45 Sec.
(A) 1000% 0.12-0.3 Sec.
0.90
600
0.80
500
0.70
400 0.60
2010 0102030405060
(B)
Am bient Temperature In Degrees Centigrade (C)
300
To use this chart: Read up from the ambient tem-
200
175
perature to the curve, and across to find a correction
135
factor. Multiply the breaker rating by the correc-
100
tion factor to determine the compensated rating.
0 Calculate the overloads in terms of the compensated
.1 110 100 1000
rating to use the published trip curve.
Do not use these devices outside their specified
Time In Seconds
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
Load Current As A Percent
Of Breaker Rating
Correction FactorCatalog 1308242
Potter & Brumfield
Issued 3-03 (PDF Rev. 11-15)
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
1.535 MAX. .19 .76 MAX.
(38.99) (4.83) (19.31)
I
.54 MAX.
.76 MAX.
(13.716)
(19.31)
O
.325 MAX.
(8.26)
AM P RATING
.37
(9.4)
.625 MAX.
(15.875)
.250 x .032 (6.35 x .813)
QUICK CONNECT TERM INALS
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
For panels greater than .105 (2.67) thickness
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 infor-
mation 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
.625-.635 .625-.635 .625-.635
(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
111
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