CMB-033-11CNN-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CMB-033-11CNN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 3A at 250V AC and 32V DC. This single-pole, panel-mount device features push-to-reset actuation and holds 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	CMB-033-11CNN-B-A
Manufacturer	Carling Technologies
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-033-11CNN-B-A are qualified based on the following critical parameters that must align for functional equivalence:

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 provide higher DC voltage capability and remain functionally compatible in applications requiring 32V DC operation.

All identified substitute parts are manufactured by OptiFuse under the CBW57 series and meet these equivalence criteria. Each substitute maintains Active product status and ROHS3 compliance.

Parameter Comparison

Parameter	CMB-033-11CNN-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)
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
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal
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
Product Status	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All five OptiFuse CBW57 series substitute parts maintain functional equivalence to the CMB-033-11CNN-B-A across critical electrical and mechanical parameters. Selection among substitute options may be based on the following factors:

Compliance and Certification: The CMB-033-11CNN-B-A carries approvals from CE, cUL, TUV, UL1077, and UL1500. OptiFuse substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both sets of approvals satisfy industrial and consumer application requirements.

DC Voltage Rating Consideration: OptiFuse substitutes are rated for 50V DC compared to the 32V DC rating of the Carling part. This higher DC rating provides additional margin in DC applications and does not restrict use in 32V DC circuits.

Inventory Availability: All substitute parts maintain Active product status with current stock levels ranging from 869 to 1358 pieces, compared to 745 pieces of the main part.

Moisture Sensitivity: OptiFuse parts specify MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series parts directly replace the Carling CMB-033-11CNN-B-A?

A: Yes. All five OptiFuse substitute parts match the critical electrical parameters: 3A current rating, 250V AC voltage rating, thermal breaker type, push-to-reset actuation, single-pole configuration, and panel-mount design. The 50V DC rating of OptiFuse parts exceeds the 32V DC requirement and does not restrict compatibility.

Q: What is the significance of the higher 50V DC rating on OptiFuse parts?

A: The 50V DC rating on OptiFuse substitutes provides a higher voltage margin than the 32V DC rating of the Carling part. In applications operating at or below 32V DC, the OptiFuse parts function identically. The higher rating does not degrade performance in lower-voltage applications.

Q: Are all five OptiFuse part numbers functionally identical?

A: All five OptiFuse CBW57 variants (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X) share identical electrical and mechanical specifications. Differences in part number suffixes reflect packaging, connector, or terminal variations. Selection among these variants depends on specific mechanical interface requirements in the application.

Q: What certifications apply to the substitute parts?

A: OptiFuse CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. These certifications overlap with the Carling part's UL1077 and UL1500 approvals, ensuring compliance in regulated applications.

Q: Are the substitute parts RoHS compliant?

A: Yes. All OptiFuse CBW57 substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the CMB-033-11CNN-B-A.

Q: What is the difference between the various OptiFuse part number suffixes?

A: The suffixes in OptiFuse part numbers (such as -EJ, -EL4, -ES, -PF-5X, and -PS-1X) indicate variations in mechanical packaging, terminal configuration, or connector type. Electrical and thermal performance remain constant across all variants. Selection should be based on the specific mechanical interface requirements of the application circuit.

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