CMB-033-11CNN-W-A/03 Equivalent & Substitute Parts

Part Overview

The CMB-033-11CNN-W-A/03 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. The part is ROHS3 compliant and carries multiple approval agencies including CE, cUL, TUV, UL1077, and UL1500. Substitute parts are identified when inventory constraints, lead time requirements, or supply chain considerations necessitate alternative sourcing while maintaining equivalent electrical and mechanical performance.

Key Parameters

Parameter	Value
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 Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-033-11CNN-W-A/03 are qualified based on strict electrical and mechanical parameter equivalence. All identified substitutes maintain the following critical parameters:

Current Rating: 3A
Voltage Rating - AC: 250V
Mounting Type: Panel Mount
Breaker Type: Thermal
Actuator Type: Push to Reset
Number of Poles: 1
Product Status: Active
RoHS Compliance: ROHS3 Compliant

The substitute parts are manufactured by OptiFuse under the CBW57 series. While the DC voltage rating differs (50V DC versus 32V DC on the main part), the 50V DC rating on substitutes provides equivalent or superior performance in applications rated for 32V DC operation. All substitutes carry active product status and equivalent regulatory approvals suitable for the same application requirements.

Parameter Comparison

Parameter	CMB-033-11CNN-W-A/03	CBW57-EJ-3A	CBW57-EL4-3A	CBW57-ES-3A	CBW57-PF-3A-5X	CBW57-PS-3A-1X
Manufacturer	Carling Technologies	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse
Series	CMB	CBW57	CBW57	CBW57	CBW57	CBW57
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
Product Status	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All five OptiFuse CBW57 series substitutes (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X) are qualified equivalents for the CMB-033-11CNN-W-A/03. Selection among these substitutes is based on availability and lead time requirements rather than electrical or mechanical differentiation.

The CBW57 series parts carry regulatory approvals including cURus, IP 40, SAE J1171, UL 1077, and UL 1500, which align with the approval requirements of the main part. All substitute parts maintain Active product status and ROHS3 compliance. The higher DC voltage rating (50V versus 32V) on the substitute parts provides operational margin in DC applications and does not restrict their use in circuits designed for 32V DC operation.

Current inventory levels for substitute parts range from 869 to 1358 pieces, compared to 785 pieces for the main part, providing multiple sourcing options for procurement planning.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CMB-033-11CNN-W-A/03 in existing designs?

A: Yes. All five CBW57 variants maintain identical current rating (3A), AC voltage rating (250V), mounting type (panel mount), actuator type (push to reset), and pole configuration (1-pole). The higher DC voltage rating on CBW57 parts (50V versus 32V) does not restrict compatibility in 32V DC applications.

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

A: No. All parts are thermal circuit breakers with identical current and AC voltage ratings. The DC voltage rating difference reflects the substitute manufacturer's specification and provides equivalent or superior performance in the specified application range.

Q: Do all five CBW57 variants have identical specifications?

A: Yes. CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X share identical electrical parameters, mounting configuration, and regulatory approvals. Differences in part numbers reflect internal OptiFuse product line designations and do not indicate functional variation.

Q: What regulatory approvals apply to the substitute parts?

A: CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 approvals. These certifications align with the approval requirements of the CMB-033-11CNN-W-A/03 and are suitable for equivalent application environments.

Q: Is there a preferred substitute part among the five options?

A: Selection among CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X is based on availability and procurement lead time. All parts are functionally equivalent and carry identical electrical specifications.

Q: Are the substitute parts RoHS compliant?

A: Yes. All five CBW57 variants are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the main part.

Q: What is the moisture sensitivity level of the substitute parts?

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

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