Datasheet W28-XQ1A-0.50, W28-XQ1A-15, W28-XQ1A-0.25, W28-XQ1A-2, W28-XQ1A-1 Specification

Issued 3-03 (PDF Rev. 10-10)

(A)

(B)

(A) All 3-20 Amp Models (B) All 0.25-2 Amp Models

Overload Trip Times

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.

Overload Trip Times

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.

1000

900

800

700

600

500

400

300

200

100

0

.1 1 10 100 1000

Load Current As A Percent

Of Breaker Rating

Time In Seconds

175

135

–20 –10 0 10 20 30 40 50 60

1.40

1.30

1.20

1.10

1.00

0.90

0.80

0.70

0.60

Correction Factor

Ambient Temperature In Degrees Centigrade (°C)

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.

Agency Approvals

28 series is UL 1077 Recognized as Supplementary Protectors, File

W

69543, and CSA Accepted as Supplementary Protectors (Appliance

E
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.

Electrical Data @ 25°C

Calibration: Will continuously carry 100% of rating.

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

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.

accordance with UL standard 1077.

Catalog 1308242

W28 series

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

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

esettable Overload Capacity: Six times rated current for 0.25 through

R

Reset Time: 180 seconds max. for 0.25 through 2 amp models. 5 to 30

Typical Resistance vs. Current Rating @ +25°C

Mechanical/Environmental Data

Termination: .250” (6.35mm) quick connects. Soldering to terminals is

Mounting: Snaps into panel from front. See Recommended

Approximate Weight: 0.35 oz. (10g).

amp models. Ten times rated current

2
for 3 through 20 amp models.

econds for 3 through 20 amp models.

s

urrent Typical Current Typical

C

Rating Resistance Rating Resistance

n Amps in Ohms in Amps in Ohms

i

0.25 14.0 8.0 0.016

0.50 3.55 9.0 0.014

0.75 2.0 10.0 0.011

1.0 0.89 11.0 0.01

2.0 0.17 12.0 0.009

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

not recommended.

Panel Cutouts.

Time vs. Current Trip Curve @ +25°C

Dimensions are shown for
reference purposes only.

110

Dimensions are in inches over
(millimeters) unless otherwise
specified.

Specifications and availability
subject to change.

Ambient Compensation Chart

To use this chart: Read up from the ambient temper-

ature 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.

www.tycoelectronics.com
Technical support:
Refer to inside back cover.

Catalog 1308242

.250 x .032 (6.35 x .813)

QUICK CONNECT TERMINALS

.625 MAX.

(15.875)

.37

(9.4)

.325 MAX.

(8.26)

.54 MAX.

(13.716)

1.535 MAX.
(38.99)

.19

(4.83)

.76 MAX.

(19.31)

.76 MAX.

(19.31)

AMP RATING

I

O

.625-.635

(15.875-16.129)

.625-.635

(15.875-16.129)

.625-.635

(15.875-16.129)

.570-.575

(14.478-14.605)

.540-.550

(13.716-13.970)

.970 DIA.

(25.64)

55-025B

INTERNAL TOOTH

PUSH-ON LOCKWASHER

For panels greater than .105” (2.67) thickness

.350

(8.89)

.525

(13.33)

.750

(19.05)

SECTION A-A

AA

Issued 3-03 (PDF Rev. 10-10)

Ordering Information

ypical Part Number

. Designator:

1

= Circuit breaker

W

. Series Number:

2

T

> W 28 -X Q1A-5

28 = Single Pole Fuseholder Type

3. Circuit Function:

= Series Trip, Push-to-Reset Button

X

. Terminal Type and Mounting:

4

= .250” (6.35mm) Quick Connect will mount in .032”-.062” (.813mm – 1.574mm) thick panel.

Q
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.

. Bezel Color:

5

= Black with White Rate Marking 11 = Black with No Rate Marking

1
2 = Red with Black Rate Marking 21 = Red with No Rate Marking
B = Black with White “Reset” Marked On Bezel (No Rate Marking)

onsult factory for other bezel colors.

C

6. Button Color:

= Black B = Red

A

onsult factory for other button colors.

C

. Amp Rating:

7

0.25 0.75 24 6 810 12 14 20
.50 1357911 13 16

0

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

Notes: 1. Soldering to terminals is not recommended.

2. Recommended Panel Thickness: Style Q: .032” - .062” (.813 mm - 1.574 mm)

mm)

3. Internal tooth push-on washer available for panel thickness not covered above.

Recommended Panel Cutouts

Dimensions are shown for
reference purposes only.

Style T: .075” - .105” (1.905 mm - 2.667

Dimensions are in inches over
(millimeters) unless otherwise
specified.

Optional Protective Boot

Clear Silicone Rubber Boot 23-019A

Optional Internal Tooth Push-On Lockwasher

For panels greater than .105 (2.67) thickness 55-025B

Disclaimer

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 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 Tyco Electronics for the latest dimensions and design specifications.

Specifications and availability
subject to change.

www.tycoelectronics.com
Technical support:
Refer to inside back cover.

111