CMB-033-00ENN-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CMB-033-00ENN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 3A at 250V AC and 32V DC with push-to-reset actuation and panel mount configuration. This component is active in production and maintains full compliance with CE, cUL, TUV, UL1077, and UL1500 standards. Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, inventory management, or supply chain continuity while maintaining identical functional performance in the application.

Key Parameters

Parameter	Value
Breaker Type	Thermal
Current Rating	3A
Voltage Rating - AC	250V
Voltage Rating - DC	32V
Actuator Type	Push to Reset
Mounting Type	Panel Mount
Number of Poles	1
Illumination	None
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-033-00ENN-B-A are qualified based on the following critical parameters that must match or exceed the main part specifications:

Matching Parameters (Required for Substitution):

Current Rating: 3A
Voltage Rating - AC: 250V
Breaker Type: Thermal
Actuator Type: Push to Reset
Mounting Type: Panel Mount
Number of Poles: 1
Illumination: None

Allowable Variance:

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 in applications requiring 32V DC operation.

All identified substitute parts are manufactured by OptiFuse under the CBW57 series and meet these substitution criteria. Each substitute maintains ROHS3 compliance and carries equivalent regulatory approvals (cURus, UL 1077, UL 1500).

Parameter Comparison

Parameter	CMB-033-00ENN-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
Actuator Type	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount
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 for the CMB-033-00ENN-B-A maintain active production status and full regulatory compliance. The CBW57 series carries cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, which overlap with and satisfy the approval requirements of the original Carling component.

The primary technical distinction between the main part and all substitutes is the DC voltage rating: the CMB-033-00ENN-B-A is rated for 32V DC, while all CBW57 variants are rated for 50V DC. This higher DC rating in the substitute parts provides enhanced capability and does not restrict their use in applications specified for 32V DC operation.

All substitute parts are ROHS3 compliant and REACH unaffected, maintaining environmental and regulatory alignment with the original component. Inventory availability is confirmed for all substitute options, with stock levels ranging from 869 to 1358 pieces.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series circuit breakers directly replace the CMB-033-00ENN-B-A in existing designs?

A: Yes. All five CBW57 variants (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X) are direct functional equivalents. They share identical current ratings (3A), AC voltage ratings (250V), actuator types (push to reset), mounting configurations (panel mount), and pole counts (1). The higher DC voltage rating (50V versus 32V) in the substitutes represents an enhancement that maintains backward compatibility.

Q: What is the significance of the different part number suffixes in the CBW57 series?

A: The suffixes (EJ, EL4, ES, PF-5X, PS-1X) indicate different connector or terminal configurations within the CBW57 base series. All variants maintain identical electrical specifications for current, voltage, and actuation characteristics. Selection among these variants depends on the specific connector or terminal interface required by the application.

Q: Are there any compliance or certification differences between the main part and substitutes?

A: Both the CMB-033-00ENN-B-A and all CBW57 substitutes carry UL 1077 and UL 1500 certifications. The CBW57 series additionally carries cURus, IP 40, and SAE J1171 approvals. All parts maintain ROHS3 compliance and REACH unaffected status. No compliance gaps exist for substitution.

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

A: All five CBW57 variants maintain active stock levels. CBW57-PF-3A-5X has the lowest inventory at 869 pieces, while CBW57-EL4-3A has the highest at 1358 pieces. Selection should account for connector type requirements and available stock levels for supply chain planning.

Q: Is the 50V DC rating of the CBW57 substitutes a limiting factor for 32V DC applications?

A: No. A higher DC voltage rating does not restrict operation at lower voltages. The 50V DC rating of the CBW57 variants ensures full functionality in applications specified for 32V DC operation without derating or performance compromise.

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