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CMB-203-00ENN-B-A Circuit Breaker Equivalent & Substitute Parts
Part Overview
The CMB-203-00ENN-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 breaker 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 become necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility permits selection from alternative manufacturers meeting identical electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | CMB-203-00ENN-B-A 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 |
| Product Status | Active |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for thermal circuit breakers is determined by strict equivalence across electrical and mechanical parameters. The following criteria establish substitutability for the CMB-203-00ENN-B-A:
Critical Matching Parameters:
- Current Rating: 20A (exact match required)
- Voltage Rating - AC: 250V (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)
- Breaker Type: Thermal (exact match required)
Acceptable Variance:
- Voltage Rating - DC: The main part specifies 32V DC. Substitute parts rated at 50V DC are acceptable, as higher DC voltage ratings provide equivalent or superior performance in applications requiring 32V DC operation.
All substitute parts listed are manufactured by OptiFuse and belong to the CBW57 series. Each substitute maintains Active product status and ROHS3 compliance. All substitute parts carry approval certifications including cURus, UL 1077, and UL 1500, ensuring regulatory equivalence.
Parameter Comparison
| Part Number | Manufacturer | Current Rating | Voltage AC | Voltage DC | Mounting Type | Actuator Type | Poles | Breaker Type | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| CMB-203-00ENN-B-A | Carling Technologies | 20A | 250V | 32V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-EJ-20A | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-EL4-20A | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-ES-20A | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-ES-20A-5H | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-ES-20A-5X | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-HS-20A-5X | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-HS-20A-C | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-PB-20A-WX | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-PF-20A-5X | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
| CBW57-PL-20A-5X | OptiFuse | 20A | 250V | 50V | Panel Mount | Push to Reset | 1 | Thermal | Active | ROHS3 Compliant |
Engineering Selection Recommendations
All listed substitute parts meet the electrical and mechanical requirements for direct substitution with the CMB-203-00ENN-B-A. Selection among the OptiFuse CBW57 series alternatives should be based on:
Regulatory Compliance: All substitute parts carry UL 1077 and UL 1500 certifications, matching the primary part's approval standards. The cURus certification on OptiFuse parts provides equivalent North American regulatory coverage.
Product Status: All substitute parts maintain Active product status, ensuring continued availability and manufacturer support.
Environmental Compliance: All substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental standards of the primary part.
Inventory Availability: OptiFuse CBW57 series parts demonstrate strong stock levels across all variants, with inventory ranging from 850 to 2458 units.
DC Voltage Rating Consideration: OptiFuse CBW57 parts are rated at 50V DC compared to the CMB-203-00ENN-B-A rating of 32V DC. This higher rating is compatible with applications requiring 32V DC operation and provides additional design margin.
Frequently Asked Questions (FAQ)
Q: Can OptiFuse CBW57 series breakers directly replace the Carling Technologies CMB-203-00ENN-B-A?
A: Yes. All listed OptiFuse CBW57 variants meet the critical electrical parameters: 20A current rating, 250V AC voltage rating, panel-mount configuration, push-to-reset actuation, and single-pole design. The 50V DC rating on OptiFuse parts exceeds the 32V DC requirement of the primary part, ensuring compatibility.
Q: What is the significance of the different part number suffixes in the CBW57 series (EJ, EL4, ES, HS, PB, PF, PL)?
A: The suffixes denote internal design variations within the CBW57 series. All variants listed maintain identical electrical specifications and mounting characteristics. Suffix differences reflect manufacturing or connector variations that do not affect electrical performance in applications requiring 20A, 250V AC, 32V DC thermal circuit protection.
Q: Are all substitute parts certified to the same standards as the CMB-203-00ENN-B-A?
A: All substitute parts carry UL 1077 and UL 1500 certifications, which are the primary standards referenced for the primary part. OptiFuse parts additionally carry cURus certification, providing equivalent regulatory coverage for North American applications.
Q: What is the difference between the CBW57-ES-20A-5H and CBW57-ES-20A-5X variants?
A: Both parts maintain identical electrical specifications and mounting characteristics. The suffix variations (5H versus 5X) indicate packaging or connector configuration differences that do not affect electrical performance or substitutability.
Q: Can I use a CBW57 part rated at 50V DC in an application designed for 32V DC?
A: Yes. A higher DC voltage rating provides equivalent or superior performance in DC applications. The 50V DC rating on OptiFuse parts is compatible with 32V DC circuit requirements.
Q: Which OptiFuse CBW57 variant should I select if all electrical parameters are equivalent?
A: Selection among equivalent variants should be based on connector type requirements specific to your panel design. All listed variants are electrically and mechanically interchangeable for the specified 20A, 250V AC, 32V DC thermal circuit breaker application.
Q: Are there any compatibility issues with panel mounting between the Carling and OptiFuse parts?
A: No. Both the CMB-203-00ENN-B-A and all listed OptiFuse CBW57 variants are panel-mount devices with identical mounting specifications, ensuring direct mechanical compatibility.
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