CLB-043-12CNN-R-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CLB-043-12CNN-R-A is a thermal circuit breaker manufactured by Carling Technologies, designed for panel mount applications requiring overcurrent protection. This single-pole breaker operates at 4A current rating with 250V AC and 32V DC voltage specifications, featuring push-to-reset actuation. The product maintains active status with full compliance to CE, cUL, TUV, UL1077, and UL1500 approval agencies. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate alternative manufacturers.

Substiute Parts

CLB-043-12CNN-R-A

Carling TechnologiesIn Stock: 1146CLB-043-12CNN-R-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 CLB-043-12CNN-R-A are identified based on strict electrical and mechanical parameter alignment. The substitution criteria are established through the following key parameters:

Critical Matching Parameters:

• Current Rating: 4A (exact match required)
• Voltage Rating - AC: 250V (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)
• Breaker Type: Thermal (exact match required)

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 original specification.

Both identified substitute parts (CBW57-ES-4A and CBW57-EJ-4A) from OptiFuse meet all critical matching parameters and operate within the allowable DC voltage variance.

Parameter Comparison

Engineering Selection Recommendations

CLB-043-12CNN-R-A (Primary Part)

The CLB-043-12CNN-R-A remains the primary selection when available. This part carries approval from CE, cUL, TUV, UL1077, and UL1500 agencies and maintains ROHS3 compliance with REACH unaffected status. Current inventory of 1065 pieces supports immediate availability.

CBW57-ES-4A (Substitute - Preferred)

The CBW57-ES-4A from OptiFuse serves as the preferred substitute option. This part meets all critical electrical and mechanical parameters with 250V AC and 50V DC ratings. Approval agencies include cURus, IP 40, SAE J1171, UL 1077, and UL 1500. ROHS3 compliance and REACH unaffected status are confirmed. Inventory availability of 2895 pieces provides robust supply assurance. Moisture Sensitivity Level (MSL) rating of 1 (Unlimited) indicates no moisture-related handling restrictions.

CBW57-EJ-4A (Substitute - Alternative)

The CBW57-EJ-4A from OptiFuse provides an alternative substitute option with identical electrical specifications to the CBW57-ES-4A. This part carries the same approval agencies and compliance certifications. Inventory of 1273 pieces supports availability. MSL rating of 1 (Unlimited) applies.

Both OptiFuse substitutes operate at 50V DC, which exceeds the original 32V DC specification, ensuring compatibility in applications designed for the CLB-043-12CNN-R-A.

Frequently Asked Questions (FAQ)

Q: Can CBW57-ES-4A and CBW57-EJ-4A be used interchangeably with CLB-043-12CNN-R-A?

A: Both OptiFuse parts meet the critical electrical and mechanical parameters of the CLB-043-12CNN-R-A. The 4A current rating, 250V AC voltage, panel mount configuration, push-to-reset actuation, and single-pole design are identical. The 50V DC rating of the substitutes exceeds the original 32V DC specification, maintaining compatibility.

Q: What is the significance of the DC voltage difference between 32V and 50V?

A: The substitute parts are rated for 50V DC, which is higher than the original 32V DC specification. This represents an enhanced capability that maintains backward compatibility. Applications designed for 32V DC operation function within the 50V DC rated envelope of the substitute parts.

Q: Are there packaging or handling differences between these parts?

A: All three parts are supplied in bulk packaging. The OptiFuse substitutes carry an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling. Standard component handling procedures apply.

Q: What approval agencies certify these circuit breakers?

A: The CLB-043-12CNN-R-A carries CE, cUL, TUV, UL1077, and UL1500 certifications. The OptiFuse substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both sets of parts meet recognized safety and performance standards.

Q: Are all three parts ROHS3 compliant?

A: Yes. The CLB-043-12CNN-R-A, CBW57-ES-4A, and CBW57-EJ-4A are all ROHS3 compliant. The CLB-043-12CNN-R-A and CBW57-ES-4A maintain REACH unaffected status.

Q: What distinguishes CBW57-ES-4A from CBW57-EJ-4A?

A: Both parts share identical electrical specifications, voltage ratings, mounting configuration, and compliance certifications. The part number suffix differentiates the variants within the OptiFuse CBW57 series. Selection between these two substitutes depends on specific procurement or application requirements.