CMB-203-11D4N-B-A/20 Equivalent & Substitute Parts

Part Overview

The CMB-203-11D4N-B-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. The breaker is designed for overcurrent protection in AC and DC applications requiring thermal response characteristics.

Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate component alternatives with equivalent electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	CMB-203-11D4N-B-A/20
Manufacturer	Carling Technologies
Series	CMB
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 Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-203-11D4N-B-A/20 are qualified based on the following critical parameters:

Electrical Equivalence Criteria:

Current Rating: 20A (exact match required)
Voltage Rating - AC: 250V (exact match required)
Voltage Rating - DC: 50V (acceptable; exceeds minimum 32V requirement)
Breaker Type: Thermal (exact match required)
Actuator Type: Push to Reset (exact match required)

Mechanical Equivalence Criteria:

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

Compliance Criteria:

RoHS3 Compliant (required)
Product Status: Active (required)

All substitute parts listed are manufactured by OptiFuse under the CBW57 series. These parts maintain identical current ratings, AC voltage ratings, actuator types, mounting configurations, and pole counts. The DC voltage rating of 50V on substitute parts provides enhanced capability beyond the 32V specification of the primary part, ensuring compatibility in applications requiring the original 32V DC rating.

Parameter Comparison

Parameter	CMB-203-11D4N-B-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
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance. The OptiFuse CBW57 series parts provide equivalent thermal protection characteristics with identical current and AC voltage ratings.

The primary distinction among substitute options relates to connector and terminal configurations, indicated by the suffix designations (EJ, EL4, ES, HS, PB, PF, PL). These variations address different panel mounting and wiring interface requirements while maintaining identical electrical performance specifications.

The DC voltage rating increase from 32V to 50V on all substitute parts represents an enhancement that does not compromise compatibility with applications designed for the original 32V specification. This higher rating provides additional safety margin in DC circuit applications.

Selection among the substitute parts should be based on mechanical interface requirements specific to the target application, including panel cutout dimensions, terminal type compatibility, and connector specifications.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series breakers directly replace the Carling Technologies CMB-203-11D4N-B-A/20?

A: Yes. All listed OptiFuse CBW57 variants maintain identical current ratings (20A), AC voltage ratings (250V), mounting type (panel mount), actuator type (push to reset), and pole configuration (single pole). The 50V DC rating on substitute parts exceeds the 32V DC requirement of the original part.

Q: What do the suffix designations (EJ, EL4, ES, HS, PB, PF, PL) indicate?

A: These suffixes denote specific connector, terminal, and mechanical interface configurations. The electrical performance remains constant across all variants. Selection should be based on the mechanical requirements of the target application, including panel mounting interface and wiring connection type.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed OptiFuse CBW57 variants are ROHS3 compliant, matching the compliance status of the primary part.

Q: Does the higher DC voltage rating (50V) on substitute parts affect compatibility?

A: No. A higher voltage rating indicates the component can safely operate at voltages up to 50V DC. Applications requiring 32V DC operation remain fully compatible, as the component is rated for this voltage and below.

Q: What inventory levels are available for substitute parts?

A: Inventory quantities vary by part number, ranging from 850 to 2458 pieces in stock. CBW57-ES-20A-5H maintains the highest inventory level at 2458 pieces.

Q: Are all substitute parts manufactured by the same company?

A: Yes. All substitute parts are manufactured by OptiFuse under the CBW57 series designation.

Q: Can I use any CBW57 variant interchangeably in my application?

A: Electrical and thermal performance are identical across all CBW57 variants listed. Mechanical interchangeability depends on your specific panel mounting interface and terminal connection requirements. Verify that the connector and terminal configuration of your selected variant matches your application's mechanical specifications.

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