CMB-203-11CNN-W-A/20 Equivalent & Substitute Parts

Part Overview

The CMB-203-11CNN-W-A/20 is a thermal circuit breaker manufactured by Carling Technologies, rated for 20A 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. Substitute parts are necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility permits selection from qualified alternative manufacturers while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
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
Illumination	None
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CMB-203-11CNN-W-A/20 is determined by strict equivalence across the following critical parameters: 20A current rating, 250V AC voltage rating, single-pole configuration, thermal breaker type, push-to-reset actuation, and panel-mount form factor. All substitute parts listed are manufactured by OptiFuse under the CBW57 series and maintain these core electrical and mechanical specifications. The DC voltage rating for substitute parts is specified at 50V, which exceeds the 32V DC requirement of the primary part and therefore provides equivalent or superior performance in DC applications. All substitute parts maintain ROHS3 compliance and active product status. Substitution is valid based on these parameters alone; no additional design modifications or testing protocols are required.

Parameter Comparison

Parameter	CMB-203-11CNN-W-A/20	CBW57-EJ-20A	CBW57-EL4-20A	CBW57-ES-20A	CBW57-ES-20A-5H	CBW57-ES-20A-5X	CBW57-HS-20A-5X	CBW57-HS-20A-C	CBW57-PB-20A-WX	CBW57-PF-20A-5X	CBW57-PL-20A-5X
Manufacturer	Carling Technologies	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal
Current Rating (Amps)	20A	20A	20A	20A	20A	20A	20A	20A	20A	20A	20A
Voltage Rating - AC	250V	250V	250V	250V	250V	250V	250V	250V	250V	250V	250V
Voltage Rating - DC	32V	50V	50V	50V	50V	50V	50V	50V	50V	50V	50V
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	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	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset
Number of Poles	1	1	1	1	1	1	1	1	1	1	1
Illumination	None	None	None	None	None	None	None	None	None	None	None
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed OptiFuse CBW57 series circuit breakers are direct functional equivalents to the CMB-203-11CNN-W-A/20 and are suitable for substitution in applications requiring 20A thermal protection at 250V AC. The substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. The elevated DC voltage rating of 50V on all substitute parts provides enhanced performance margin in DC circuit applications compared to the primary part's 32V specification. Selection among the CBW57 variants should be based on specific connector or terminal configurations required by the application, as all electrical and mechanical parameters remain equivalent. Approval agencies for substitute parts include cURus, IP 40, SAE J1171, UL 1077, and UL 1500, providing comprehensive certification coverage for industrial and automotive applications.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series circuit breakers directly replace the CMB-203-11CNN-W-A/20 in existing designs?

A: Yes. All CBW57 variants listed maintain identical current rating (20A), AC voltage rating (250V), mounting configuration (panel mount), actuation method (push to reset), and pole count (1). The 50V DC rating on substitute parts exceeds the 32V DC specification of the primary part, providing equivalent or superior performance in DC applications.

Q: What is the significance of the different CBW57 part number suffixes (EJ, EL4, ES, HS, PB, PF, PL)?

A: The suffixes denote variations in connector type, terminal configuration, or housing material. All variants maintain identical electrical specifications (20A, 250V AC, 50V DC, thermal, push to reset, single pole). Selection should be based on the specific connector or terminal interface required by the application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All CBW57 series substitute parts listed are ROHS3 compliant, matching the environmental compliance status of the CMB-203-11CNN-W-A/20.

Q: What approval standards do the substitute parts carry?

A: OptiFuse CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. The primary part carries CE, cUL, TUV, UL1077, and UL1500 certifications. Both sets of approvals are suitable for industrial and automotive thermal protection applications.

Q: Is the higher DC voltage rating (50V vs. 32V) on substitute parts a concern?

A: No. A higher voltage rating indicates the component can safely operate at higher voltages without degradation. Applications operating at or below 32V DC will function identically with the 50V-rated substitute parts.

Q: Can I mix CMB and CBW57 parts in the same assembly?

A: Yes. Since all electrical and mechanical parameters are equivalent, CMB-203-11CNN-W-A/20 and any CBW57 variant can be used interchangeably within the same design or assembly without modification.

Q: What inventory levels are available for substitute parts?

A: Inventory varies by variant. CBW57-ES-20A-5H maintains the highest stock at 2,458 units. CBW57-PL-20A-5X maintains the lowest at 862 units. All variants are in active stock as new original parts.

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