W28-X1081-3 Equivalent & Substitute Parts

Part Overview

The W28-X1081-3 is a thermal circuit breaker manufactured by TE Connectivity Potter & Brumfield Relays. This single-pole, panel-mount device provides overcurrent protection at 3A with dual voltage ratings of 250 V AC and 32 V DC. The push-to-reset actuator enables manual circuit restoration following a thermal trip event. The part is Active in product status and RoHS Compliant, with unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical specifications and mechanical mounting characteristics are required for design flexibility, inventory optimization, or supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	W28-X1081-3
Manufacturer	TE Connectivity Potter & Brumfield Relays
Series	W28
Breaker Type	Thermal
Current Rating	3A
Voltage Rating - AC	250 V
Voltage Rating - DC	32 V
Mounting Type	Panel Mount
Actuator Type	Push to Reset
Number of Poles	1
Product Status	Active
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the W28-X1081-3 are qualified based on strict electrical and mechanical parameter equivalence. All substitute parts share the following critical specifications:

Qualifying Parameters:

Current Rating: 3A
Voltage Rating - AC: 250 V
Voltage Rating - DC: 32 V
Breaker Type: Thermal
Mounting Type: Panel Mount
Actuator Type: Push to Reset
Number of Poles: 1

Substitution is valid when all qualifying parameters match the main part. Variations in RoHS compliance status, REACH classification, and MSL rating do not disqualify a part from substitution, as these represent regulatory and environmental attributes rather than functional performance criteria. Packaging format (Bulk vs. other configurations) and inventory levels are logistical considerations and do not affect electrical or mechanical compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Mounting Type	Actuator Type	Poles	Product Status	RoHS Status
W28-X1081-3	TE Connectivity Potter & Brumfield Relays	W28	3	250	32	Panel Mount	Push to Reset	1	Active	RoHS Compliant
W28-XQ1A-3	TE Connectivity Potter & Brumfield Relays	W28	3	250	32	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
W28-XQ1B-3	TE Connectivity Potter & Brumfield Relays	W28	3	250	32	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
W28-XT1A-3	TE Connectivity Potter & Brumfield Relays	W28	3	250	32	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
W28-XTBA-3	TE Connectivity Potter & Brumfield Relays	W28	3	250	32	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
QLB-033-00DNN-3BA	Qualtek	QLB	3	250	32	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
QLB-033-11B3N-3BA	Qualtek	QLB	3	250	32	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
QMB-033-00ENN-3BA	Qualtek	QMB	3	250	32	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
QMB-033-11C3N-3BA	Qualtek	QMB	3	250	32	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are Active in product status and meet or exceed the RoHS compliance requirement of the main part. The TE Connectivity Potter & Brumfield Relays W28 series substitutes (W28-XQ1A-3, W28-XQ1B-3, W28-XT1A-3, W28-XTBA-3) maintain manufacturer continuity and are available in high inventory quantities, supporting supply chain stability.

Qualtek alternatives (QLB-033-00DNN-3BA, QLB-033-11B3N-3BA, QMB-033-00ENN-3BA, QMB-033-11C3N-3BA) provide cross-manufacturer substitution with equivalent electrical and mechanical specifications. The QMB series variants include TUV approval agency certification. All Qualtek parts are ROHS3 Compliant and REACH Affected.

Selection between TE Connectivity and Qualtek alternatives depends on procurement requirements, qualification protocols, and supply chain preferences. All parts share identical functional parameters and panel-mount mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the W28-X1081-3?

A: A part qualifies as a substitute when it matches all critical electrical and mechanical parameters: 3A current rating, 250 V AC and 32 V DC voltage ratings, thermal breaker type, panel-mount configuration, push-to-reset actuator, and single-pole design. Differences in RoHS revision level, REACH status, or MSL rating do not affect substitution eligibility.

Q: Can I use a Qualtek part in place of the TE Connectivity W28-X1081-3?

A: Yes. Qualtek QLB and QMB series parts listed (QLB-033-00DNN-3BA, QLB-033-11B3N-3BA, QMB-033-00ENN-3BA, QMB-033-11C3N-3BA) are electrically and mechanically equivalent. Cross-manufacturer substitution is valid when all functional parameters match. Design qualification and procurement approval processes should be followed per your organization's standards.

Q: Does packaging format affect substitution compatibility?

A: No. Packaging format (Bulk, tape-and-reel, or other configurations) is a logistical consideration and does not affect electrical performance or mechanical fit. The substitute part will function identically in the circuit regardless of packaging format.

Q: Are there differences in thermal performance between the W28 and Qualtek alternatives?

A: All substitute parts share identical current ratings (3A) and voltage specifications (250 V AC, 32 V DC). Thermal performance characteristics are determined by these ratings and the thermal breaker design. Functional equivalence is established through parameter matching.

Q: What is the difference between W28-XQ1A-3 and W28-XT1A-3?

A: Both parts are TE Connectivity W28 series thermal circuit breakers with identical electrical specifications (3A, 250 V AC, 32 V DC) and panel-mount configuration. Differences in part number designation reflect internal design or manufacturing variations. Both are Active products and ROHS3 Compliant. Selection between them depends on availability and procurement requirements.

Q: Can I mix different substitute parts in the same equipment?

A: Yes. All listed substitute parts meet identical functional specifications and panel-mount mechanical requirements. Multiple parts from different manufacturers or series can be used in the same design without electrical or mechanical compatibility issues.

Q: What does REACH Affected status mean for substitution?

A: REACH Affected indicates the part is subject to REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations. This is a regulatory and supply chain attribute. REACH status does not affect electrical performance or mechanical compatibility and does not disqualify a part from substitution.

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