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

Part Overview

The CMB-203-11CNN-W-A 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. The device is RoHS3 compliant and REACH unaffected. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across alternative manufacturers, ensuring functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
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
Illumination	None
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CMB-203-11CNN-W-A are qualified based on strict equivalence of the following critical parameters:

Electrical Parameters:

Current Rating: 20A (exact match required)
Voltage Rating - AC: 250V (exact match required)
Voltage Rating - DC: 50V (substitute parts rated at 50V DC exceed the 32V DC requirement and remain compatible)

Mechanical Parameters:

Breaker Type: Thermal (exact match required)
Mounting Type: Panel Mount (exact match required)
Actuator Type: Push to Reset (exact match required)
Number of Poles: 1 (exact match required)

Compliance Parameters:

Product Status: Active (all substitutes maintain Active status)
RoHS Status: ROHS3 Compliant (all substitutes maintain compliance)

All substitute parts are manufactured by OptiFuse under the CBW57 series. The higher DC voltage rating (50V versus 32V) on substitute parts does not compromise compatibility, as circuit breakers rated for higher voltages operate safely at lower voltage levels.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage AC	Voltage DC	Breaker Type	Mounting	Actuator	Poles	Product Status	RoHS Status	Inventory (Pcs)
CMB-203-11CNN-W-A	Carling Technologies	CMB	20	250V	32V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	774
CBW57-EJ-20A	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	1978
CBW57-EL4-20A	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	850
CBW57-ES-20A	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	1833
CBW57-ES-20A-5H	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	2458
CBW57-ES-20A-5X	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	1097
CBW57-HS-20A-5X	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	1804
CBW57-HS-20A-C	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	1724
CBW57-PB-20A-WX	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	1176
CBW57-PF-20A-5X	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	994
CBW57-PL-20A-5X	OptiFuse	CBW57	20	250V	50V	Thermal	Panel Mount	Push to Reset	1	Active	ROHS3	862

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original CMB-203-11CNN-W-A. The OptiFuse CBW57 series substitutes carry approval certifications including cURus, IP 40, SAE J1171, UL 1077, and UL 1500, which overlap with and exceed the original part's certification scope.

The primary technical distinction between the main part and substitutes is the DC voltage rating: the CMB-203-11CNN-W-A is rated at 32V DC, while all CBW57 substitutes are rated at 50V DC. This higher rating on substitute parts provides enhanced capability without compromising circuit protection function. A circuit breaker rated for 50V DC operates safely and effectively at 32V DC and lower voltages.

Selection among the CBW57 substitute variants should be based on specific connector or terminal configurations required by the application, as indicated by the suffix designations (EJ, EL4, ES, HS, PB, PF, PL). All variants maintain identical electrical performance and thermal protection characteristics at the 20A, 250V AC specification.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CMB-203-11CNN-W-A?

A: Yes. All CBW57 substitute parts maintain the critical electrical parameters: 20A current rating, 250V AC voltage rating, thermal breaker type, single-pole configuration, and push-to-reset actuation. The 50V DC rating on CBW57 parts exceeds the 32V DC requirement and does not affect compatibility.

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

A: The suffix designations identify connector or terminal type variations within the CBW57 series. All variants maintain identical electrical and thermal protection specifications. Selection should be based on the specific connector interface required by the application.

Q: Are all substitute parts RoHS3 compliant?

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

Q: What is the significance of the higher 50V DC rating on substitute parts?

A: Circuit breakers rated for higher voltages operate safely at lower voltages. The 50V DC rating on CBW57 parts provides additional margin and does not compromise protection at the 32V DC operating level of the original specification.

Q: Which substitute part has the highest inventory availability?

A: CBW57-ES-20A-5H maintains the highest inventory level at 2458 pieces in stock.

Q: Do all substitute parts carry the same approval certifications?

A: All CBW57 substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. These certifications overlap with and exceed the original part's certification requirements (CE, cUL, TUV, UL1077, UL1500).

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message