CMB-203-11CNN-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CMB-203-11CNN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 20A at 250V AC and 32V DC. This single-pole, panel-mount breaker features push-to-reset actuation and is designed for overcurrent protection in industrial and commercial applications. The part maintains active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, enabling direct replacement in circuit protection applications where thermal breaker functionality is required.

Key Parameters

Parameter	CMB-203-11CNN-B-A
Breaker Type	Thermal
Current Rating	20A
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-203-11CNN-B-A are qualified based on the following critical parameters:

Electrical Equivalence:

Current Rating: 20A (exact match required)
Voltage Rating - AC: 250V (exact match required)
Breaker Type: Thermal (exact match required)
Actuator Type: Push to Reset (exact match required)

Mechanical Equivalence:

Mounting Type: Panel Mount (exact match required)
Number of Poles: 1 (exact match required)

Regulatory & Environmental:

Product Status: Active
RoHS Compliance: ROHS3 Compliant

All substitute parts listed maintain these core parameters. Voltage Rating - DC varies between 32V and 50V across the substitute group; the 50V DC rating in substitute parts provides equivalent or superior performance in DC applications where the main part is rated 32V DC.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Breaker Type	Mounting Type	Actuator Type	Poles	Product Status	RoHS Status
CMB-203-11CNN-B-A	Carling Technologies	20	250	32	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-EJ-20A	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-EL4-20A	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-ES-20A	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-ES-20A-5H	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-ES-20A-5X	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-HS-20A-5X	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-HS-20A-C	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-PB-20A-WX	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-PF-20A-5X	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant
CBW57-PL-20A-5X	OptiFuse	20	250	50	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and environmental regulatory adherence. The OptiFuse CBW57 series substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, providing equivalent or superior regulatory coverage compared to the Carling Technologies CMB-203-11CNN-B-A.

The primary electrical difference is the DC voltage rating: substitute parts are rated 50V DC compared to the main part's 32V DC rating. This higher DC rating does not restrict substitution in applications where the main part is specified, as the substitute parts operate within the same AC voltage envelope (250V) and current specification (20A).

All substitute parts are manufactured by OptiFuse and belong to the CBW57 series. Selection among substitute options should be based on specific connector or terminal configurations indicated by the part number suffix, which are not differentiated in the provided electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series breakers from OptiFuse directly replace the CMB-203-11CNN-B-A?

A: Yes. All listed CBW57 substitutes match the critical electrical parameters: 20A current rating, 250V AC voltage rating, thermal breaker type, push-to-reset actuation, single-pole configuration, and panel-mount design. The 50V DC rating in substitute parts exceeds the 32V DC specification of the main part, maintaining compatibility in DC applications.

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

A: The suffixes (EJ, EL4, ES, HS, PB, PF, PL) and additional designations (5H, 5X, C, WX) indicate variations in connector type, terminal configuration, or mechanical interface. These variations do not affect the core electrical performance or substitution eligibility when the primary electrical and mechanical parameters remain constant.

Q: Are all substitute parts in active product status?

A: Yes. All listed substitute parts maintain active product status, ensuring continued manufacturing support and availability.

Q: Do substitute parts carry the same regulatory certifications as the main part?

A: Substitute parts carry UL 1077 and UL 1500 certifications matching the main part. Additionally, OptiFuse substitutes include cURus, IP 40, and SAE J1171 certifications, providing equivalent or enhanced regulatory coverage.

Q: Is the higher DC voltage rating (50V) in substitute parts a concern for applications rated 32V DC?

A: No. A higher voltage rating indicates the component can safely operate at higher voltages. In applications where 32V DC is specified, a 50V DC-rated component operates within its safe operating envelope and is fully compatible.

Q: What inventory levels are available for substitute parts?

A: Inventory varies by part number, ranging from 850 to 2,458 pieces in stock. CBW57-ES-20A-5H maintains the highest inventory at 2,458 pieces.

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