CMB-033-27J5N-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CMB-033-27J5N-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 3A 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 CE, cUL, TUV, UL1077, and UL1500 standards.

Substitute parts become necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility permits selection from qualified alternative manufacturers. The substitute parts listed below maintain electrical and mechanical compatibility within the specified parameter ranges.

Substiute Parts

CMB-033-27J5N-B-A

Carling TechnologiesIn Stock: 845CMB-033-27J5N-B-A Datasheet

Current PartRFQ

CBW57-EJ-3A

OptiFuseIn Stock: 1310CBW57-EJ-3A Datasheet

Parametric EquivalentRFQ

CBW57-EL4-3A

OptiFuseIn Stock: 1370CBW57-EL4-3A Datasheet

Parametric EquivalentRFQ

CBW57-ES-3A

OptiFuseIn Stock: 1344CBW57-ES-3A Datasheet

Parametric EquivalentRFQ

CBW57-PF-3A-5X

OptiFuseIn Stock: 938CBW57-PF-3A-5X Datasheet

Parametric EquivalentRFQ

CBW57-PS-3A-1X

OptiFuseIn Stock: 1225CBW57-PS-3A-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMB-033-27J5N-B-A is permissible with OptiFuse CBW57 series circuit breakers when the following parameters are maintained:

Critical Parameters for Substitution:

• Current Rating: 3A (exact match required)
• Voltage Rating - AC: 250V (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)

Allowable Variance:

• Voltage Rating - DC: The main part specifies 32V DC. Substitute parts rated at 50V DC provide enhanced DC voltage capability and remain compatible for applications requiring 32V DC operation.

All substitute parts are manufactured by OptiFuse, belong to the CBW57 series, maintain Active product status, and carry ROHS3 compliance with REACH Unaffected designation. Each substitute part is qualified to UL 1077 and UL 1500 standards, ensuring functional and safety equivalence.

Parameter Comparison

Engineering Selection Recommendations

All five OptiFuse CBW57 series substitute parts (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X) are qualified equivalents for the CMB-033-27J5N-B-A. Selection among these substitutes should be based on the following factors:

Compliance and Certification: All substitute parts maintain Active product status and carry ROHS3 compliance with REACH Unaffected designation. Each part is certified to UL 1077 and UL 1500 standards, with additional certifications including cURus, IP 40, and SAE J1171. These certifications align with or exceed the original part's approval agencies (CE, cUL, TUV, UL1077, UL1500).

Voltage Capability: The substitute parts are rated for 50V DC, compared to the original part's 32V DC rating. This enhanced DC voltage rating provides additional design margin for applications operating at or below 32V DC and does not restrict use in such applications.

Inventory Availability: Current stock levels for substitute parts range from 869 to 1358 pieces, providing multiple sourcing options. The original CMB-033-27J5N-B-A maintains 755 pieces in stock.

Packaging: All substitute parts are supplied in Bulk packaging, consistent with standard circuit breaker distribution formats.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series circuit breakers directly replace the CMB-033-27J5N-B-A in existing designs?

A: Yes. The CBW57 series substitute parts maintain identical electrical ratings (3A, 250V AC), mechanical form factor (panel mount, single-pole), and actuation method (push to reset). The 50V DC rating of the CBW57 series provides enhanced capability for applications requiring 32V DC operation.

Q: What is the significance of the higher DC voltage rating on the substitute parts?

A: The substitute parts are rated for 50V DC compared to the original part's 32V DC. This higher rating provides additional design margin and does not restrict operation at lower voltages. Applications designed for 32V DC operation remain fully compatible with the 50V DC-rated substitutes.

Q: Are all five CBW57 variants electrically equivalent?

A: Yes. All five CBW57 variants (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X) share identical electrical specifications, thermal characteristics, and safety certifications. Differences in part numbers reflect manufacturing or packaging variations within the OptiFuse product line.

Q: Do the substitute parts carry the same safety certifications as the original part?

A: The substitute parts carry UL 1077 and UL 1500 certifications, which are common to both the original and substitute parts. The substitute parts additionally carry cURus, IP 40, and SAE J1171 certifications. All parts maintain ROHS3 compliance and REACH Unaffected status.

Q: What is the Moisture Sensitivity Level (MSL) for the substitute parts?

A: All CBW57 series substitute parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Can I mix CMB and CBW57 series circuit breakers in the same application or panel?

A: Yes. Both series are thermally-actuated, single-pole, 3A circuit breakers with identical AC voltage ratings and push-to-reset actuation. They are mechanically and electrically compatible for panel-mount applications.

Q: What should I consider when selecting among the five CBW57 substitute options?

A: Selection should be based on current inventory availability, lead time requirements, and any specific connector or terminal configurations required by your application. All five variants are electrically and mechanically equivalent. Consult the detailed part specifications for any mechanical or terminal differences not covered in the parametric data.