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

Part Overview

The CMB-203-11DNN-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 device features push-to-reset actuation and holds active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards. The component is RoHS3 compliant and REACH unaffected. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate alternative manufacturers while maintaining equivalent electrical and mechanical performance.

Key Parameters

Parameter	Value
Manufacturer	Carling Technologies
Part Number	CMB-203-11DNN-B-A
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

Substitution of the CMB-203-11DNN-B-A is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 20A
Voltage Rating - AC: 250V
Mounting Type: Panel Mount
Breaker Type: Thermal
Actuator Type: Push to Reset
Number of Poles: 1
Illumination: None

Acceptable Variation:

Voltage Rating - DC: The CMB-203-11DNN-B-A operates at 32V DC. All identified substitute parts from OptiFuse (CBW57 series) operate at 50V DC, which represents a higher voltage capability and is functionally compatible for applications requiring 32V DC operation.

All substitute parts maintain active product status, RoHS3 compliance, and equivalent approval agency certifications (cURus, UL 1077, UL 1500). The CBW57 series from OptiFuse provides direct functional equivalence with enhanced DC voltage rating capability.

Parameter Comparison

Parameter	CMB-203-11DNN-B-A	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
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 from the OptiFuse CBW57 series meet the functional requirements of the CMB-203-11DNN-B-A. Selection among the substitute options is based on the following engineering considerations:

Compliance and Certification: All substitute parts maintain active product status and carry relevant approval certifications including cURus, UL 1077, and UL 1500. The CBW57 series additionally includes SAE J1171 and IP 40 ratings, providing enhanced specification coverage for industrial applications.

Voltage Capability: The CBW57 series operates at 50V DC, exceeding the 32V DC requirement of the CMB-203-11DNN-B-A. This higher DC voltage rating provides operational margin and compatibility with a broader range of DC circuit applications without performance degradation.

Inventory Availability: Substitute part selection may be influenced by current inventory levels. CBW57-ES-20A-5H maintains the highest inventory at 2,458 pieces, followed by CBW57-ES-20A at 1,833 pieces. All substitute parts are available in quantities exceeding 850 pieces, ensuring supply continuity.

Moisture Sensitivity: All OptiFuse CBW57 parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series parts directly replace the Carling Technologies CMB-203-11DNN-B-A?

A: Yes. All CBW57 series parts listed are parametric equivalents matching the 20A current rating, 250V AC voltage rating, panel-mount configuration, thermal breaker type, push-to-reset actuation, and single-pole design. The 50V DC rating of the CBW57 series exceeds the 32V DC requirement and is functionally compatible.

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

A: The CBW57 series 50V DC rating represents enhanced voltage capability. For applications requiring 32V DC operation, the 50V DC rated breaker operates within its design envelope with operational margin. This does not affect performance or safety in 32V DC circuits.

Q: Are there differences between the various CBW57 part numbers?

A: The CBW57 series variants (EJ, EL4, ES, HS, PB, PF, PL) differ in internal construction, terminal configuration, or mechanical design features not specified in the provided parameters. All variants maintain identical electrical ratings: 20A, 250V AC, 50V DC, thermal type, push-to-reset actuation, and single-pole configuration.

Q: What packaging is available for these substitute parts?

A: All substitute parts are supplied in bulk packaging, consistent with the CMB-203-11DNN-B-A packaging specification.

Q: Do the substitute parts carry the same regulatory approvals?

A: The substitute parts carry UL 1077 and UL 1500 certifications matching the primary part. The CBW57 series additionally includes cURus, IP 40, and SAE J1171 approvals, providing expanded compliance documentation for specific application requirements.

Q: Is there a preferred substitute part among the CBW57 options?

A: Selection among CBW57 variants is determined by specific application requirements regarding terminal type and mechanical configuration. All variants are electrically and functionally equivalent for the stated 20A, 250V AC, 32V DC application. Inventory availability and delivery requirements may influence selection.

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