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CMB-203-00ENN-W-D Equivalent & Substitute Parts
Part Overview
The CMB-203-00ENN-W-D 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 part 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 suppliers.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CMB-203-00ENN-W-D |
| 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
Substitution eligibility for the CMB-203-00ENN-W-D is determined by 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
Allowable Variation:
- Voltage Rating - DC: The main part specifies 32V DC. Substitute parts rated at 50V DC are acceptable as this represents a higher voltage capability and maintains backward compatibility in applications requiring 32V DC operation.
All identified substitute parts are manufactured by OptiFuse under the CBW57 series. Each substitute maintains identical AC voltage, current rating, mounting configuration, breaker type, actuation method, and pole count. The DC voltage rating increase from 32V to 50V in substitute parts provides enhanced capability without compromising compatibility in standard 32V DC applications.
Parameter Comparison
| Parameter | CMB-203-00ENN-W-D | 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 substitute parts listed maintain active product status and full RoHS3 compliance, ensuring regulatory alignment with the original CMB-203-00ENN-W-D. The OptiFuse CBW57 series substitutes carry approval certifications including cURus, IP 40, SAE J1171, UL 1077, and UL 1500, providing equivalent or enhanced compliance coverage compared to the original part's CE, cUL, TUV, UL1077, and UL1500 certifications.
The primary distinction among substitute options is the DC voltage rating elevation from 32V to 50V. This increase does not compromise functionality in applications specified for 32V DC operation and provides additional margin for circuits operating at lower DC voltages. All substitute parts maintain identical AC voltage, current capacity, mounting configuration, and actuation characteristics.
Selection among the CBW57 variants should be based on inventory availability and specific connector or terminal configurations required by the application. All listed substitutes are functionally equivalent for 20A thermal circuit protection at 250V AC and 32V DC (or lower) operating conditions.
Frequently Asked Questions (FAQ)
Q: Can OptiFuse CBW57 series parts directly replace the Carling Technologies CMB-203-00ENN-W-D?
A: Yes. All listed OptiFuse CBW57 variants are parametric equivalents. They maintain identical current rating (20A), AC voltage rating (250V), mounting type (panel mount), breaker type (thermal), actuation method (push to reset), and pole configuration (single pole). The DC voltage rating increase from 32V to 50V in substitute parts is compatible with applications requiring 32V DC operation.
Q: What is the significance of the higher 50V DC rating in substitute parts?
A: The 50V DC rating in OptiFuse CBW57 substitutes represents enhanced voltage capability. Applications requiring 32V DC operation function within the 50V DC rated envelope. The higher rating provides additional safety margin and does not affect performance in standard 32V DC circuits.
Q: Are all CBW57 variants listed as substitutes functionally identical?
A: All listed CBW57 variants (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) share identical electrical specifications and performance characteristics. Differences in part number suffixes indicate variations in connector types, terminal configurations, or packaging options. Selection should be based on specific connector or terminal requirements of the application.
Q: Do substitute parts meet the same regulatory standards as the original CMB-203-00ENN-W-D?
A: OptiFuse CBW57 substitutes carry UL 1077 and UL 1500 certifications matching the original part. Additional certifications include cURus, IP 40, and SAE J1171. All substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory alignment with the original component.
Q: What inventory levels are available for substitute parts?
A: Inventory availability varies by specific CBW57 variant. CBW57-ES-20A-5H maintains the highest inventory at 2,458 pieces. CBW57-PL-20A-5X maintains the lowest at 862 pieces. All variants are in stock as new original components.
Q: Can the CMB-203-00ENN-W-D be used interchangeably with any CBW57 variant in existing designs?
A: Interchangeability depends on connector and terminal type compatibility. All CBW57 variants maintain identical electrical performance and panel-mount configuration. Physical connector or terminal differences indicated by part number suffixes must be verified against the specific application's interface requirements before substitution.
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