CMB-043-00ENN-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CMB-043-00ENN-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 low-voltage 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 requirements necessitate alternative suppliers.

Substiute Parts

CMB-043-00ENN-B-A

Carling TechnologiesIn Stock: 944CMB-043-00ENN-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-043-00ENN-B-A are identified based on electrical and mechanical parameter alignment. The critical parameters determining substitution eligibility are:

Mandatory Matching Parameters:

• Current Rating: 4A
• Voltage Rating - AC: 250V
• Breaker Type: Thermal
• Mounting Type: Panel Mount
• Actuator Type: Push to Reset
• Number of Poles: 1

Allowable Variance:

• DC Voltage Rating: The main part specifies 32V DC. Substitute parts rated for 50V DC are acceptable as this represents a higher voltage capability and maintains backward compatibility with the 32V DC requirement.

The identified substitutes (CBW57-ES-4A and CBW57-EJ-4A) from OptiFuse meet all mandatory parameters and provide equivalent functionality with enhanced DC voltage ratings.

Parameter Comparison

Engineering Selection Recommendations

Both CBW57-ES-4A and CBW57-EJ-4A from OptiFuse serve as direct functional equivalents to the CMB-043-00ENN-B-A. Selection between these options is based on the following criteria:

CBW57-ES-4A:

• Inventory availability: 2895 pieces in stock
• Compliance: cURus, IP 40, SAE J1171, UL 1077, UL 1500
• REACH Status: REACH Unaffected
• Moisture Sensitivity Level: 1 (Unlimited)

CBW57-EJ-4A:

• Inventory availability: 1273 pieces in stock
• Compliance: cURus, IP 40, SAE J1171, UL 1077, UL 1500
• Moisture Sensitivity Level: 1 (Unlimited)

Both parts maintain ROHS3 compliance and active product status. The CBW57-ES-4A offers higher inventory availability. Both parts carry equivalent regulatory approvals suitable for the intended application. The DC voltage rating increase from 32V to 50V in both substitutes provides additional operational margin without compromising compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can CBW57-ES-4A and CBW57-EJ-4A be used interchangeably with CMB-043-00ENN-B-A?

A: Yes. Both OptiFuse parts match the critical electrical parameters: 4A current rating, 250V AC voltage rating, thermal breaker type, push-to-reset actuation, and single-pole configuration. The 50V DC rating in the substitutes exceeds the 32V DC requirement of the original part, maintaining full compatibility.

Q: What is the significance of the DC voltage rating difference?

A: The main part is rated for 32V DC operation. The substitute parts are rated for 50V DC. A higher DC voltage rating indicates the component can safely operate across a broader voltage range, including the original 32V DC specification. This represents an enhancement rather than a limitation.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both CBW57-ES-4A and CBW57-EJ-4A are ROHS3 compliant, matching the compliance status of the CMB-043-00ENN-B-A.

Q: What regulatory approvals do the substitute parts carry?

A: The OptiFuse substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 approvals. These certifications align with the regulatory framework of the original part and are suitable for equivalent applications.

Q: How do the packaging and inventory considerations affect part selection?

A: Both substitute parts are supplied in bulk packaging. CBW57-ES-4A has 2895 pieces in stock, while CBW57-EJ-4A has 1273 pieces available. Inventory levels may influence selection based on project volume requirements.

Q: Is the Moisture Sensitivity Level (MSL) rating important for these parts?

A: Both substitute parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling. This matches the operational requirements of thermal circuit breakers in standard industrial environments.