CMB-043-11C3N-B-A Equivalent & Substitute Parts

Part Overview

The CMB-043-11C3N-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 4A at 250V AC and 32V DC. This single-pole, panel-mount device features push-to-reset actuation and is designed for overcurrent protection in low-voltage applications. The part maintains active product status with full compliance to RoHS3, REACH Unaffected, and multiple approval agencies including UL1077, UL1500, CE, cUL, and TUV certifications. Equivalent substitute parts are necessary when primary inventory is unavailable or when design requirements call for alternative manufacturer sourcing while maintaining identical electrical and mechanical specifications.

Substiute Parts

CMB-043-11C3N-B-A

Carling TechnologiesIn Stock: 725CMB-043-11C3N-B-A Datasheet

Current PartRFQ

W28-XQ1A-4

TE Connectivity Potter & Brumfield RelaysIn Stock: 1013W28-XQ1A-4 Datasheet

Parametric EquivalentRFQ

W28-XT1A-4

TE Connectivity Potter & Brumfield RelaysIn Stock: 1522W28-XT1A-4 Datasheet

Parametric EquivalentRFQ

W28-XTBA-4

TE Connectivity Potter & Brumfield RelaysIn Stock: 1537W28-XTBA-4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CMB-043-11C3N-B-A are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

• Current Rating: 4A (exact match required)
• Voltage Rating - AC: 250V (exact match required)
• Voltage Rating - DC: 32V (exact match required)
• Breaker Type: Thermal (exact match required)
• Mounting Type: Panel Mount (exact match required)
• Actuator Type: Push to Reset (exact match required)
• Number of Poles: 1 (exact match required)

All three substitute parts—W28-XQ1A-4, W28-XT1A-4, and W28-XTBA-4—are manufactured by TE Connectivity Potter & Brumfield Relays and meet all specified electrical and mechanical parameters. These parts are functionally interchangeable with the CMB-043-11C3N-B-A in applications requiring identical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain active product status and full RoHS3 compliance, ensuring long-term availability and environmental regulatory adherence. The CMB-043-11C3N-B-A and W28-XQ1A-4 share identical REACH Unaffected status, making either suitable for applications with REACH-sensitive supply chain requirements. The W28-XT1A-4 and W28-XTBA-4 are classified as REACH Affected; selection of these alternatives requires confirmation that REACH compliance documentation is acceptable within the application's regulatory framework. All parts carry identical ECCN and HTSUS classifications, supporting consistent export and tariff treatment. Selection among the three TE Connectivity alternatives should be based on inventory availability and REACH compliance requirements specific to the end application.

Frequently Asked Questions (FAQ)

Q: Are the W28 series parts direct replacements for the CMB-043-11C3N-B-A?

A: Yes. All three W28 series parts (W28-XQ1A-4, W28-XT1A-4, W28-XTBA-4) are parametric equivalents with identical electrical ratings (4A, 250V AC, 32V DC), breaker type (thermal), mounting configuration (panel mount), and actuation method (push to reset). They are functionally interchangeable in applications requiring these specifications.

Q: What is the difference between the three substitute parts?

A: The three W28 series parts are electrically and mechanically identical. The primary differences are in regulatory classification: W28-XQ1A-4 maintains REACH Unaffected status matching the original part, while W28-XT1A-4 and W28-XTBA-4 are classified as REACH Affected. Moisture Sensitivity Level (MSL) differs between W28-XQ1A-4 (MSL 1, Unlimited) and the other two variants (MSL Not Applicable).

Q: Can I use these substitutes in existing designs without modification?

A: Yes. The substitute parts share identical panel-mount configuration, push-to-reset actuation, and single-pole design. No circuit modifications or mechanical redesign is required for substitution.

Q: What certifications do these parts carry?

A: The CMB-043-11C3N-B-A carries CE, cUL, TUV, UL1077, and UL1500 approvals. All substitute parts maintain RoHS3 compliance and EAR99 export classification. Verify that the substitute part's specific certification documentation meets your application requirements.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Current inventory levels differ: CMB-043-11C3N-B-A (679 pcs), W28-XQ1A-4 (924 pcs), W28-XT1A-4 (1477 pcs), and W28-XTBA-4 (1466 pcs). Selection based on availability may influence lead time and supply chain continuity.