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CMB-203-11C3B-B-A Equivalent & Substitute Parts
Part Overview
The CMB-203-11C3B-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. The breaker is designed for overcurrent protection in AC and DC applications requiring thermal response characteristics. Equivalent substitute parts are necessary to address supply chain availability, inventory optimization, and application-specific mounting or connector requirements while maintaining identical electrical performance and safety certifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Carling Technologies |
| Part Number | CMB-203-11C3B-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 |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitute parts for the CMB-203-11C3B-B-A are qualified based on the following electrical and mechanical parameters:
Critical Matching Parameters:
- Current Rating: 20A (exact match required)
- Voltage Rating - AC: 250V (exact match required)
- 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)
Acceptable 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 with the original specification.
Compliance Requirements: All substitute parts maintain ROHS3 compliance and REACH Unaffected status. Substitute parts from OptiFuse (CBW57 series) carry equivalent or expanded approval agencies including cURus, IP 40, SAE J1171, UL 1077, and UL 1500, which satisfy the original part's CE, cUL, TUV, UL1077, and UL1500 certifications.
Parameter Comparison
| Part Number | Manufacturer | Current Rating (A) | Voltage AC (V) | Voltage DC (V) | Breaker Type | Mounting Type | Actuator Type | Poles | RoHS Status | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| CMB-203-11C3B-B-A | Carling Technologies | 20 | 250 | 32 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-EJ-20A | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-EL4-20A | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-ES-20A | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-ES-20A-5H | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-ES-20A-5X | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-HS-20A-5X | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-HS-20A-C | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-PB-20A-WX | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-PF-20A-5X | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-PL-20A-5X | OptiFuse | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
Engineering Selection Recommendations
All listed substitute parts from the OptiFuse CBW57 series are qualified equivalents for the CMB-203-11C3B-B-A. Selection among substitute options is determined by application-specific connector or terminal requirements, as indicated by the suffix designations (EJ, EL4, ES, HS, PB, PF, PL) in each part number.
Compliance Basis:
- All substitute parts maintain Active product status, ensuring continued manufacturing support and availability.
- OptiFuse CBW57 series parts carry cURus, UL 1077, and UL 1500 certifications, which satisfy the original Carling Technologies part's regulatory requirements.
- All parts are ROHS3 compliant and REACH Unaffected, meeting environmental and hazardous substance directives.
- The 50V DC rating on substitute parts provides enhanced capability over the original 32V DC specification, ensuring compatibility in applications operating at or below 32V DC.
Inventory Availability: Substitute parts demonstrate robust inventory levels ranging from 850 to 2,458 pieces in stock, supporting immediate procurement needs.
Frequently Asked Questions (FAQ)
Q: Can OptiFuse CBW57 series parts directly replace the Carling Technologies CMB-203-11C3B-B-A?
A: Yes. All listed OptiFuse CBW57 series parts are parametric equivalents. They match the critical electrical specifications (20A, 250V AC, thermal type, push-to-reset actuation, single-pole, panel mount) and carry equivalent safety certifications. The higher 50V DC rating on OptiFuse parts is a capability enhancement and does not affect compatibility with 32V DC applications.
Q: What do the suffix designations in OptiFuse part numbers represent?
A: The suffixes (EJ, EL4, ES, HS, PB, PF, PL) indicate connector or terminal type variations. Selection depends on the specific terminal configuration required for your application. All variants maintain identical electrical performance and safety ratings.
Q: Are there any compliance or certification differences between the main part and substitutes?
A: No material differences exist. The OptiFuse CBW57 series carries cURus, IP 40, SAE J1171, UL 1077, and UL 1500 approvals, which satisfy the original part's CE, cUL, TUV, UL1077, and UL1500 requirements. All parts are ROHS3 compliant and REACH Unaffected.
Q: Why is the DC voltage rating higher on substitute parts?
A: OptiFuse CBW57 series parts are rated for 50V DC, compared to the original 32V DC specification. This represents a higher voltage capability and maintains full backward compatibility. Applications operating at 32V DC or lower operate within the substitute part's rated envelope.
Q: What is the Moisture Sensitivity Level (MSL) for substitute parts?
A: OptiFuse CBW57 series parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.
Q: Are all substitute parts available in the same packaging as the original?
A: All substitute parts are supplied in Bulk packaging. The original CMB-203-11C3B-B-A packaging designation was not specified in the reference data.
Q: Can I mix and match different OptiFuse CBW57 variants in the same application?
A: Yes. All listed CBW57 variants are electrically and mechanically equivalent. Selection among variants is based solely on terminal or connector type requirements for your specific panel or circuit configuration.
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