CLB-073-27ENN-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CLB-073-27ENN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 7A at 250V AC and 32V DC with push-to-reset panel mount actuation. This single-pole breaker is designed for overcurrent protection in low-voltage DC and AC applications. The product maintains active status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards. Substitute parts are identified when equivalent electrical and mechanical parameters are required for component replacement, inventory management, or design flexibility while maintaining identical functional performance.

Key Parameters

Parameter	Value
Breaker Type	Thermal
Current Rating	7A
Voltage Rating - AC	250V
Voltage Rating - DC	32V
Mounting Type	Panel Mount
Actuator Type	Push to Reset
Number of Poles	1
Illumination	None
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CLB-073-27ENN-B-A are qualified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Primary Matching Parameters:

Current Rating: 7A (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)

Secondary Consideration:

Voltage Rating - DC: The main part specifies 32V DC. Substitute parts rated at 50V DC exceed the minimum requirement and remain compatible for applications operating at or below 32V DC.

All substitute parts are manufactured by OptiFuse under the CBW57 series and maintain ROHS3 compliance and active product status. Substitutes are electrically and mechanically interchangeable for the specified application parameters.

Parameter Comparison

Parameter	CLB-073-27ENN-B-A (Carling)	CBW57-EJ-7A (OptiFuse)	CBW57-EL4-7A (OptiFuse)	CBW57-ES-7A-5H (OptiFuse)	CBW57-HS-7A-5C (OptiFuse)
Manufacturer	Carling Technologies	OptiFuse	OptiFuse	OptiFuse	OptiFuse
Series	CLB	CBW57	CBW57	CBW57	CBW57
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal
Current Rating (Amps)	7A	7A	7A	7A	7A
Voltage Rating - AC	250V	250V	250V	250V	250V
Voltage Rating - DC	32V	50V	50V	50V	50V
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount
Actuator Type	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset
Number of Poles	1	1	1	1	1
Illumination	None	None	None	None	None
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All four substitute parts (CBW57-EJ-7A, CBW57-EL4-7A, CBW57-ES-7A-5H, and CBW57-HS-7A-5C) are qualified equivalents for the CLB-073-27ENN-B-A based on matching electrical and mechanical specifications. Selection among substitutes may be determined by:

Compliance Certifications: The main part carries CE, cUL, TUV, UL1077, and UL1500 approvals. All substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both certification sets satisfy industrial and commercial application requirements.

Product Availability: All substitute parts maintain active product status with current inventory. CBW57-ES-7A-5H offers the highest inventory level at 2482 pieces, followed by CBW57-EL4-7A at 1998 pieces, CBW57-EJ-7A at 1884 pieces, and CBW57-HS-7A-5C at 1197 pieces.

DC Voltage Rating: Substitute parts are rated for 50V DC, which exceeds the main part's 32V DC specification. This higher rating provides additional safety margin in DC applications operating at or below 32V DC.

Moisture Sensitivity: All substitute parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series breakers directly replace the CLB-073-27ENN-B-A in existing applications?

A: Yes. All four CBW57 variants match the critical parameters: 7A current rating, 250V AC voltage rating, panel mount configuration, push-to-reset actuation, and single-pole design. Mechanical and electrical interchangeability is confirmed.

Q: Why do the substitute parts have a higher DC voltage rating (50V vs. 32V)?

A: The 50V DC rating on CBW57 parts exceeds the minimum requirement of 32V DC. This higher rating does not affect compatibility; the breaker operates identically in applications at or below 32V DC. The higher rating provides additional design margin.

Q: Are there differences in approval certifications between the main part and substitutes?

A: Both the main part and substitutes carry UL 1077 and UL 1500 certifications. The main part includes CE and TUV approvals, while substitutes include cURus and SAE J1171 certifications. Both certification profiles meet industrial standards for thermal circuit breakers.

Q: Which substitute part should be selected for new designs?

A: All four substitutes are functionally equivalent. Selection may be based on inventory availability, lead time, or existing supplier relationships. CBW57-ES-7A-5H, CBW57-EL4-7A, and CBW57-EJ-7A offer higher inventory levels than CBW57-HS-7A-5C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts carry ROHS3 Compliant status, matching the environmental compliance of the main part.

Q: What is the MSL rating for the substitute parts?

A: All CBW57 variants carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage, handling, or transportation.

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