CMB-033-11C3N-B-D Equivalent & Substitute Parts

Part Overview

The CMB-033-11C3N-B-D 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. The device is ROHS3 compliant and REACH unaffected. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate alternative suppliers.

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
Illumination	None
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-033-11C3N-B-D 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)
Breaker Type: Thermal (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)

Allowable 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 substitute parts are manufactured by OptiFuse under the CBW57 series and maintain active product status with equivalent compliance certifications (cURus, UL 1077, UL 1500). All substitutes are ROHS3 compliant and REACH unaffected.

Parameter Comparison

Parameter	CMB-033-11C3N-B-D (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
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 meet the electrical and mechanical requirements for direct substitution with the CMB-033-11C3N-B-D. Selection among the substitute options should be based on:

Compliance Alignment: All substitute parts carry cURus, UL 1077, and UL 1500 certifications, which overlap with the primary part's UL1077 and UL1500 approvals. The primary part includes CE and TUV certifications; verification of regional compliance requirements is necessary if these specific certifications are mandated by application standards.

Inventory Availability: Substitute parts demonstrate varying stock levels:

CBW57-EL4-3A: 1358 units
CBW57-ES-3A: 1289 units
CBW57-PS-3A-1X: 1120 units
CBW57-EJ-3A: 1203 units
CBW57-PF-3A-5X: 869 units

DC Voltage Rating: All substitutes are rated for 50V DC, exceeding the primary part's 32V DC specification. This higher rating provides enhanced margin for DC applications within the 32V DC operating envelope.

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

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CMB-033-11C3N-B-D?

A: Yes. All five CBW57 variants (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, CBW57-PS-3A-1X) meet the critical electrical and mechanical parameters: 3A current rating, 250V AC voltage rating, thermal breaker type, panel mount configuration, push-to-reset actuation, and single-pole design.

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

A: The substitute parts' 50V DC rating represents a higher voltage capability. This does not create incompatibility; rather, it provides additional voltage margin. Applications operating at 32V DC or lower are fully supported by parts rated for 50V DC.

Q: Are there differences in approval agencies between the primary part and substitutes?

A: The primary part carries CE, cUL, TUV, UL1077, and UL1500 approvals. Substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 approvals. Both sets include UL1077 and UL1500. Applications requiring CE or TUV certification specifically should confirm substitute part compliance with regional standards before selection.

Q: Do all substitute parts have the same moisture sensitivity level?

A: Yes. All five OptiFuse CBW57 variants specify MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage, handling, or transportation.

Q: Which substitute part should be selected if inventory is the primary consideration?

A: CBW57-EL4-3A offers the highest inventory level at 1358 units. CBW57-ES-3A provides 1289 units as a secondary option.

Q: Are there any mechanical or dimensional differences between the primary part and substitutes?

A: All parts share identical mounting type (panel mount), actuator type (push to reset), and pole configuration (single pole). No mechanical incompatibilities exist for direct substitution in panel-mount applications.

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