CMB-033-11C5N-B-A Equivalent & Substitute Parts

Part Overview

The CMB-033-11C5N-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. The component is RoHS3 compliant and carries multiple approval agencies 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 specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	CMB-033-11C5N-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
Illumination	None
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-033-11C5N-B-A are qualified based on the following critical parameters that must remain constant across all equivalent devices:

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
Illumination: None

All identified substitute parts are manufactured by OptiFuse under the CBW57 series. These devices maintain identical current ratings, AC voltage ratings, mounting configurations, and actuation mechanisms. The DC voltage rating for substitute parts is specified at 50V, which exceeds the 32V DC specification of the original part, providing enhanced capability within the same form factor and electrical interface requirements.

Parameter Comparison

Parameter	CMB-033-11C5N-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
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 circuit breakers listed as substitutes maintain Active product status and ROHS3 compliance, ensuring long-term availability and environmental regulatory alignment with the original CMB-033-11C5N-B-A component.

The substitute parts carry approval certifications including cURus, IP 40, SAE J1171, UL 1077, and UL 1500. These certifications overlap substantially with the original part's approval agencies (CE, cUL, TUV, UL1077, UL1500), with UL 1077 and UL 1500 present in both the original and substitute specifications.

The DC voltage rating differential (50V for substitutes versus 32V for the original) represents an uprated specification that does not restrict application in circuits designed for the original 32V DC rating. All substitute parts are available in bulk packaging with inventory levels ranging from 869 to 1358 pieces.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series circuit breakers directly replace the CMB-033-11C5N-B-A in existing applications?

A: Yes, provided the application operates within the specified electrical parameters. All substitute parts maintain identical current ratings (3A), AC voltage ratings (250V), mounting configurations (panel mount), and actuation mechanisms (push to reset). The higher DC voltage rating (50V) of the substitutes does not create incompatibility with 32V DC circuits.

Q: What is the significance of the different part number suffixes within the CBW57 series (EJ, EL4, ES, PF-5X, PS-1X)?

A: The suffixes denote internal design variations within the OptiFuse CBW57 series. All variants listed maintain identical electrical specifications and mechanical compatibility for the 3A, 250V AC application. Selection among these variants depends on specific design requirements not differentiated by the provided parameters.

Q: Are there compliance differences between the original Carling part and OptiFuse substitutes?

A: Both the original and substitute parts are ROHS3 compliant and carry UL 1077 and UL 1500 certifications. The original part includes CE and TUV approvals, while substitutes carry cURus and SAE J1171 certifications. Application requirements determine whether the specific certification set is critical for deployment.

Q: What inventory considerations apply when selecting among the five substitute options?

A: All five CBW57 variants maintain substantial inventory levels. CBW57-PF-3A-5X has the lowest inventory at 869 pieces, while CBW57-EL4-3A has the highest at 1358 pieces. Inventory levels should be evaluated against project lead time and volume requirements.

Q: Is the DC voltage rating difference between the original (32V) and substitutes (50V) a limiting factor?

A: No. The 50V DC rating of substitute parts exceeds the original specification and does not restrict their use in applications designed for 32V DC operation. The higher rating provides additional margin in DC applications without creating incompatibility.

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