CMB-033-11C2N-W-A/03 Equivalent & Substitute Parts

Part Overview

The CMB-033-11C2N-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 regulatory approvals including CE, cUL, TUV, UL1077, and UL1500. Substitute parts are identified when equivalent electrical and mechanical parameters are required for applications where the original part is unavailable or when design flexibility permits alternative manufacturers within the same performance envelope.

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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-033-11C2N-W-A/03 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Current Rating: 3A (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)

Acceptable Variation:

Voltage Rating - DC: The main part specifies 32V DC. Substitute parts rated at 50V DC are acceptable as this represents a higher voltage capability and maintains backward compatibility with the 32V DC requirement.

All identified substitute parts are manufactured by OptiFuse under the CBW57 series and meet these criteria. Each substitute maintains identical AC voltage rating, current rating, mounting configuration, and actuation method while providing enhanced DC voltage capability.

Parameter Comparison

Parameter	CMB-033-11C2N-W-A/03 (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
Illumination	None	None	None	None	None	None
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 Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the original CMB-033-11C2N-W-A/03.

Regulatory Compliance Considerations:

The original part carries approvals from CE, cUL, TUV, UL1077, and UL1500. The substitute parts carry approvals from cURus, IP 40, SAE J1171, UL 1077, and UL 1500. Both sets include UL1077 and UL1500 certifications, which are the primary standards for thermal circuit breakers. The substitute parts include additional certifications (cURus, IP 40, SAE J1171) that provide supplementary compliance coverage.

DC Voltage Rating Enhancement:

The substitute parts are rated for 50V DC compared to the original 32V DC specification. This higher rating provides additional safety margin in DC applications and does not create incompatibility with circuits designed for 32V DC operation.

Inventory Availability:

All substitute parts are in stock with quantities ranging from 869 to 1358 pieces, providing supply security for production requirements.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CMB-033-11C2N-W-A/03 in existing designs?

A: Yes. The CBW57 series parts match all critical electrical parameters (3A, 250V AC, 32V DC minimum) and mechanical specifications (panel mount, push-to-reset, single-pole thermal). The higher 50V DC rating of the substitute parts does not create incompatibility with 32V DC circuit designs.

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

A: The 50V DC rating on CBW57 parts represents enhanced voltage capability. Since the original application requires 32V DC operation, the 50V DC rating provides additional safety margin and is fully backward compatible with the original specification.

Q: Are there differences in regulatory approvals between the original and substitute parts?

A: Both the original CMB-033-11C2N-W-A/03 and the CBW57 substitute parts carry UL1077 and UL1500 certifications, which are the primary standards governing thermal circuit breaker performance and safety. The substitute parts include additional certifications (cURus, IP 40, SAE J1171) that provide supplementary compliance documentation.

Q: Do all five CBW57 variants perform identically in the 3A, 250V AC application?

A: Yes. All five CBW57 variants (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X) share identical electrical ratings and thermal characteristics. Variant designations reflect different connector or terminal configurations, not performance differences.

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

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

Q: Are the substitute parts REACH compliant?

A: Yes. The CBW57 series parts carry REACH Unaffected status, matching the original part's compliance profile.

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