Catalog 1308242
Issued 3-03 (PDF Rev. 10-10)
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.
Button extends for visual trip indication.
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.
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.
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.
Typical Resistance vs. Current Rating @ +25°C
Current
Rating
in Amps
0.25
0.50
0.75
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Typical
Resistance
in Ohms
14.0
3.55
2.0
0.89
0.17
0.069
0.043
0.030
0.026
0.017
Current
Rating
in Amps
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
20.0
Typical
Resistance
in Ohms
0.016
0.014
0.011
0.01
0.009
0.009
0.007
0.007
0.007
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.
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
1000
(A) All 3-20 Amp Models
(B) All 0.25-2 Amp Models
Overload
Trip Times
Ambient Compensation Chart
1.40
Overload
Trip Times
900
800
Load Current As A Percent
Of Breaker Rating
700
600
500
400
300
200
100
0
.1
1
(A)
1.30
Correction Factor
1.20
1.10
1.00
0.90
0.80
0.70
0.60
–20 –10 0 10 20 30 40 50 60
Ambient Temperature In Degrees Centigrade (°C)
100%
135%
200%
400%
600%
800%
1000%
No Trip
Trip in 1 hour
2.2-15.0 Sec.
0.55-1.8 Sec.
0.27-0.7 Sec.
0.17-0.45 Sec.
0.12-0.3 Sec.
100%
175%
200%
400%
600%
No Trip
Trip in 1 hour
4.5-28.0 Sec.
1.0-6.5 Sec.
0.4-4.0 Sec.
(B)
175
135
10
Time In Seconds
100
1000
To use this chart:
Read up from the ambient temper-
ature to the curve, and across to find a correction fac-
tor. Multiply the breaker rating by the correction fac-
tor 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
110
reference purposes only.
Dimensions are in inches over
(millimeters) unless otherwise
specified.
Specifications and availability
subject to change.
www.tycoelectronics.com
Technical support:
Refer to inside back cover.
Catalog 1308242
Issued 3-03 (PDF Rev. 10-10)
Ordering Information
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:
11 = Black with No Rate Marking
1 = Black with White 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)
6. Button Color:
A = Black
7. Amp Rating:
0.25 0.75
1
0.50
B = Red
> W
28
-X
Q
1
A
-5
Consult factory for other bezel colors.
Consult factory for other button colors.
2
3
4
5
6
7
8
9
10
11
12
13
14
16
20
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-0.50
W28-XQ1A-0.75
W28-XQ1A-1
W28-XQ1A-2
W28-XQ1A-3
W28-XQ1A-4
W28-XQ1A-5
W28-XQ1A-6
W28-XQ1A-7
W28-XQ1A-8
W28-XQ1A-10
W28-XQ1A-12
W28-XQ1A-15
W28-XQ1A-20
W28-XT1A-10
W28-XT1A-12
Outline Dimensions
Push-to-Reset Type
1.535 MAX.
(38.99)
.19
(4.83)
.76 MAX.
(19.31)
Optional Protective Boot
Clear Silicone Rubber Boot
23-019A
A
A
.54 MAX.
(13.716)
I
O
.37
(9.4)
.325 MAX.
(8.26)
.76 MAX.
(19.31)
AMP RATING
.350
(8.89)
.525
(13.33)
.750
(19.05)
SECTION A-A
.625 MAX.
(15.875)
.250 x .032 (6.35 x .813)
QUICK CONNECT TERMINALS
Optional Internal Tooth Push-On Lockwasher
For panels greater than .105 (2.67) thickness
55-025B
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)
3. Internal tooth push-on washer available for panel thickness not covered above.
.970 DIA.
(25.64)
Recommended Panel Cutouts
.570-.575
(14.478-14.605)
.540-.550
(13.716-13.970)
55-025B
INTERNAL TOOTH
PUSH-ON LOCKWASHER
For panels greater than .105” (2.67) thickness
Disclaimer
.625-.635
(15.875-16.129)
.625-.635
(15.875-16.129)
.625-.635
(15.875-16.129)
While Tyco Electronics has made every reasonable effort to ensure the accuracy
of the information in this document, Tyco Electronics does not guarantee that it
is error-free, nor does Tyco Electronics make any other representation, warranty
or guarantee that the information is accurate, correct, reliable or current.
Tyco Electronics reserves the right to make any adjustments to the information
contained herein at any time without notice. Tyco Electronics expressly dis-
claims all implied warranties regarding the information contained herein, includ-
ing, 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 Tyco Electronics for the latest dimensions and design specifications.
Dimensions are shown for
reference purposes only.
Dimensions are in inches over
(millimeters) unless otherwise
specified.
Specifications and availability
subject to change.
www.tycoelectronics.com
Technical support:
111
Refer to inside back cover.
MEMS sensors
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