CMB-043-11CNN-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CMB-043-11CNN-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 breaker features push-to-reset actuation and is designed for overcurrent protection in industrial and commercial applications. The part maintains active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory constraints require component alternatives that meet equivalent electrical and mechanical specifications.

Substiute Parts

CMB-043-11CNN-B-A

Carling TechnologiesIn Stock: 892CMB-043-11CNN-B-A Datasheet

Current PartRFQ

CBW57-EJ-4A

OptiFuseIn Stock: 1289CBW57-EJ-4A Datasheet

Parametric EquivalentRFQ

CBW57-ES-4A

OptiFuseIn Stock: 2935CBW57-ES-4A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CMB-043-11CNN-B-A are identified based on strict equivalence of the following critical parameters: breaker type (thermal), current rating (4A), AC voltage rating (250V), mounting configuration (panel mount), actuator mechanism (push to reset), and pole count (single pole). The substitute parts CBW57-ES-4A and CBW57-EJ-4A, both manufactured by OptiFuse, meet these core electrical and mechanical requirements. Both substitute parts are rated for 4A at 250V AC and feature identical mounting, actuation, and pole configurations. The DC voltage rating for substitute parts is specified at 50V, which exceeds the 32V DC requirement of the main part, providing enhanced capability within the same form factor and electrical class. All substitute parts maintain ROHS3 compliance and active product status.

Parameter Comparison

Engineering Selection Recommendations

The CMB-043-11CNN-B-A and its substitute parts CBW57-ES-4A and CBW57-EJ-4A are functionally equivalent for applications requiring 4A thermal circuit protection at 250V AC. Selection between these parts is determined by availability and compliance requirements specific to the application environment. The main part carries CE, cUL, TUV, UL1077, and UL1500 certifications. The substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both substitute parts exceed the DC voltage specification of the main part at 50V versus 32V, providing additional operational margin in DC applications. All three parts maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment. Component selection should be based on certification requirements for the specific application and current inventory availability.

Frequently Asked Questions (FAQ)

Q: What makes CBW57-ES-4A and CBW57-EJ-4A suitable substitutes for CMB-043-11CNN-B-A?

A: Both substitute parts match the critical electrical parameters of the main part: 4A current rating, 250V AC voltage rating, thermal breaker type, single-pole configuration, panel-mount design, and push-to-reset actuation. All three parts are ROHS3 compliant and maintain active product status.

Q: How does the 50V DC rating on the substitute parts compare to the 32V DC rating on the main part?

A: The 50V DC rating on CBW57-ES-4A and CBW57-EJ-4A exceeds the 32V DC specification of CMB-043-11CNN-B-A. This higher rating provides additional operational capability and margin in DC circuit applications without affecting AC performance or form factor compatibility.

Q: Are there differences in certification between the main part and substitute parts?

A: The main part carries CE, cUL, TUV, UL1077, and UL1500 certifications. The substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both sets include UL 1077 and UL 1500 standards. Application-specific certification requirements should be verified before final component selection.

Q: Can CBW57-ES-4A and CBW57-EJ-4A be used interchangeably with CMB-043-11CNN-B-A?

A: Yes, both substitute parts are parametrically equivalent to the main part for the specified electrical and mechanical parameters. Interchangeability is based on matching current rating, AC voltage rating, mounting type, actuator mechanism, and pole count.

Q: What is the difference between CBW57-ES-4A and CBW57-EJ-4A?

A: Both parts are manufactured by OptiFuse within the CBW57 series and share identical electrical specifications: 4A current rating, 250V AC, 50V DC, thermal breaker type, panel mount, push-to-reset actuation, and single-pole configuration. The designation difference (ES versus EJ) reflects manufacturer part numbering conventions; both parts meet the same parametric requirements for substitution.

Q: Are all three parts available in the same packaging format?

A: All three parts are supplied in bulk packaging. Current inventory levels are: CMB-043-11CNN-B-A (823 pcs), CBW57-ES-4A (2895 pcs), and CBW57-EJ-4A (1273 pcs).