CMB-043-27G3N-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CMB-043-27G3N-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 requirements necessitate alternative suppliers.

Substiute Parts

CMB-043-27G3N-B-A

Carling TechnologiesIn Stock: 1273CMB-043-27G3N-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-043-27G3N-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:

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

The substitute parts CBW57-ES-4A and CBW57-EJ-4A, both manufactured by OptiFuse, meet all mandatory matching parameters and operate within the allowable DC voltage variance. Both parts are ROHS3 compliant and carry active product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: CMB-043-27G3N-B-A

The CMB-043-27G3N-B-A remains the specified component when Carling Technologies sourcing is required or when design documentation explicitly calls for this manufacturer. This part carries approvals from CE, cUL, TUV, UL1077, and UL1500, with ROHS3 compliance and REACH unaffected status.

Substitute Option 1: CBW57-ES-4A

The CBW57-ES-4A is a direct functional equivalent manufactured by OptiFuse. This part matches all mandatory electrical and mechanical parameters with 2,895 units in current inventory. Approvals include cURus, IP 40, SAE J1171, UL 1077, and UL 1500. The higher DC voltage rating (50V versus 32V) provides enhanced capability for DC applications. ROHS3 compliance and REACH unaffected status are confirmed.

Substitute Option 2: CBW57-EJ-4A

The CBW57-EJ-4A is functionally equivalent to the primary part, also manufactured by OptiFuse. This part satisfies all mandatory parameter requirements with 1,273 units in current inventory. Approvals include cURus, IP 40, SAE J1171, UL 1077, and UL 1500. The 50V DC rating provides the same enhanced capability as CBW57-ES-4A. ROHS3 compliance and MSL 1 (Unlimited) rating are specified.

Both OptiFuse substitutes are suitable for direct replacement in applications where the 250V AC and 4A current requirements are primary design constraints. The increased DC voltage rating does not compromise compatibility with 32V DC circuits.

Frequently Asked Questions (FAQ)

Q: Can CBW57-ES-4A or CBW57-EJ-4A be used as direct replacements for CMB-043-27G3N-B-A?

A: Yes. Both OptiFuse parts match the critical electrical parameters: 4A current rating, 250V AC voltage, thermal breaker type, push-to-reset actuation, and single-pole configuration. The panel-mount form factor is identical. The 50V DC rating on the substitute parts exceeds the 32V DC requirement of the primary part, maintaining full compatibility.

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

A: Both parts share identical electrical specifications and parameter ratings. The designation difference (ES versus EJ) reflects OptiFuse internal product line differentiation. Both are ROHS3 compliant, active products with equivalent functionality for the specified 4A, 250V AC application.

Q: Are there compliance differences between the primary part and substitutes?

A: The primary part carries CE, cUL, TUV, UL1077, and UL1500 approvals. The OptiFuse substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 approvals. Both sets of certifications are appropriate for industrial circuit breaker applications. Design documentation should be reviewed to confirm which approval set is required for the specific application.

Q: Does the higher DC voltage rating on the substitute parts affect compatibility?

A: No. A 50V DC rated breaker is fully compatible with 32V DC circuits. The higher rating indicates the component can safely operate at higher voltages, providing additional margin for the application. This does not compromise performance at lower voltages.

Q: What packaging is available for these parts?

A: All three parts are supplied in bulk packaging. Current inventory levels are: CMB-043-27G3N-B-A (1,164 units), CBW57-ES-4A (2,895 units), and CBW57-EJ-4A (1,273 units).

Q: Are these parts RoHS compliant?

A: Yes. All three parts are ROHS3 compliant. The primary part is REACH unaffected. Both OptiFuse substitutes are REACH unaffected (CBW57-ES-4A) or carry MSL 1 (Unlimited) rating (CBW57-EJ-4A).