CMB-033-11CNB-B-A Equivalent & Substitute Parts

Part Overview

The CMB-033-11CNB-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 3A 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 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 design flexibility permits equivalent component selection.

Key Parameters

Parameter	Value
Manufacturer	Carling Technologies
Part Number	CMB-033-11CNB-B-A
Series	CMB
Breaker Type	Thermal
Current Rating	3A
Voltage Rating - AC	250V
Voltage Rating - DC	32V
Mounting Type	Panel Mount
Actuator Type	Push to Reset
Number of Poles	1
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-033-11CNB-B-A are qualified based on the following critical parameters that must align with the main part specification:

Mandatory Matching Parameters:

Current Rating: 3A
Voltage Rating - AC: 250V
Mounting Type: Panel Mount
Breaker Type: Thermal
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 that maintains backward compatibility with 32V DC applications.

All identified substitute parts are manufactured by OptiFuse under the CBW57 series and meet these substitution criteria. Each substitute maintains thermal breaker functionality with identical current and AC voltage ratings, panel mount configuration, and push-to-reset actuation.

Parameter Comparison

Parameter	CMB-033-11CNB-B-A (Carling)	CBW57-EJ-3A (OptiFuse)	CBW57-EL4-3A (OptiFuse)	CBW57-ES-3A (OptiFuse)	CBW57-PF-3A-5X (OptiFuse)	CBW57-PS-3A-1X (OptiFuse)
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal
Current Rating (Amps)	3A	3A	3A	3A	3A	3A
Voltage Rating - AC	250V	250V	250V	250V	250V	250V
Voltage Rating - DC	32V	50V	50V	50V	50V	50V
Mounting Type	Panel Mount	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	Push to Reset
Number of Poles	1	1	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All five OptiFuse CBW57 series substitute parts maintain functional equivalence to the CMB-033-11CNB-B-A across critical electrical parameters. Selection among these substitutes should be based on the following factors:

Compliance and Certification: The main part carries CE, cUL, TUV, UL1077, and UL1500 approvals. Substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both sets include UL 1077 and UL 1500 standards applicable to thermal circuit breakers. Applications requiring specific regional compliance (CE marking, TUV) should confirm substitute part acceptance within the target market.

Voltage Rating Consideration: The substitute parts are rated for 50V DC compared to the main part's 32V DC rating. This higher DC voltage rating does not restrict use in 32V DC applications and provides additional design margin for circuits operating at or below 32V DC.

Availability and Inventory: Substitute parts demonstrate active inventory status with quantities ranging from 869 to 1358 pieces. Selection may be influenced by supply chain requirements and lead time considerations.

Packaging: All substitute parts are supplied in bulk packaging, consistent with the main part's standard distribution format.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CMB-033-11CNB-B-A in existing designs?

A: Yes. The CBW57 series substitutes match all critical electrical parameters: 3A current rating, 250V AC voltage rating, 32V DC compatibility (substitutes rated 50V DC), panel mount configuration, push-to-reset actuation, and single-pole design. Physical mounting dimensions and terminal configurations must be verified for mechanical fit in the specific application.

Q: What is the significance of the 50V DC rating on substitute parts versus the 32V DC rating on the main part?

A: The 50V DC rating on OptiFuse substitutes represents a higher voltage capability. Applications operating at 32V DC or lower are fully compatible with 50V DC-rated breakers. The higher rating provides additional safety margin and does not compromise performance in lower-voltage circuits.

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

A: The main part carries CE, cUL, TUV, UL1077, and UL1500 certifications. Substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both include UL 1077 and UL 1500 standards for thermal circuit breakers. Applications requiring CE or TUV marking should confirm substitute part acceptance in the target regulatory environment.

Q: How do I select among the five OptiFuse substitute part numbers?

A: All five CBW57 variants (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, CBW57-PS-3A-1X) are electrically and functionally equivalent. Selection should be based on availability, supply chain lead times, and any specific mechanical or connector requirements of the application. The part number suffix indicates different connector or terminal configurations.

Q: Are all substitute parts RoHS compliant?

A: Yes. All five OptiFuse CBW57 series substitutes are ROHS3 compliant, matching the environmental compliance status of the main part.

Q: What is the Moisture Sensitivity Level (MSL) for substitute parts?

A: OptiFuse CBW57 series parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

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