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CMB-203-11CNN-W-D Equivalent & Substitute Parts
Part Overview
The CMB-203-11CNN-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 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 specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CMB-203-11CNN-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 |
| Illumination | None |
| Product Status | Active |
| RoHS Status | ROHS3 Compliant |
| Approval Agencies | CE, cUL, TUV, UL1077, UL1500 |
Substitute Part Grouping Explanation
Substitute parts for the CMB-203-11CNN-W-D are qualified based on strict equivalence of the following critical parameters:
Electrical Specifications:
- Current Rating: 20A (exact match required)
- Voltage Rating - AC: 250V (exact match required)
- Voltage Rating - DC: 50V (acceptable; exceeds minimum 32V requirement)
Mechanical Specifications:
- 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 & Status:
- Product Status: Active (required)
- RoHS Status: ROHS3 Compliant (required)
- Approval Agencies: UL1077 and UL1500 (minimum required certifications present in all substitutes)
All substitute parts are manufactured by OptiFuse under the CBW57 series. The DC voltage rating of 50V in substitute parts exceeds the 32V DC specification of the main part, providing enhanced capability within the same thermal circuit breaker category. No illumination is present in any part, maintaining consistency across the substitution group.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Series | Current Rating (A) | Voltage AC (V) | Voltage DC (V) | Breaker Type | Mounting Type | Actuator Type | Poles | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| CMB-203-11CNN-W-D | Carling Technologies | CMB | 20 | 250 | 32 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-EJ-20A | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-EL4-20A | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-ES-20A | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-ES-20A-5H | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-ES-20A-5X | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-HS-20A-5X | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-HS-20A-C | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-PB-20A-WX | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-PF-20A-5X | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
| CBW57-PL-20A-5X | OptiFuse | CBW57 | 20 | 250 | 50 | Thermal | Panel Mount | Push to Reset | 1 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
All listed substitute parts maintain active product status and full RoHS3 compliance, ensuring long-term availability and regulatory alignment with the original CMB-203-11CNN-W-D specification. The OptiFuse CBW57 series substitutes carry UL1077 and UL1500 certifications, meeting the minimum approval agency requirements established for the primary part. The enhanced DC voltage rating of 50V in substitute parts provides operational margin beyond the 32V DC specification of the original component.
Selection among the CBW57 variants should be based on specific connector or terminal configuration requirements, 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 rating. Inventory availability across the substitute group ranges from 850 to 2458 pieces, supporting both immediate and sustained procurement requirements.
Frequently Asked Questions (FAQ)
Q: Can CBW57 series parts directly replace the CMB-203-11CNN-W-D in existing applications?
A: Yes. All CBW57 substitute parts match the critical electrical parameters (20A, 250V AC) and mechanical specifications (thermal breaker type, panel mount, push-to-reset actuation, single pole) of the CMB-203-11CNN-W-D. The 50V DC rating in substitute parts exceeds the 32V DC requirement, maintaining full compatibility.
Q: What is the significance of the different CBW57 suffix designations?
A: The suffix designations (EJ, EL4, ES, HS, PB, PF, PL) indicate variations in connector or terminal configurations. These suffixes do not affect the thermal protection characteristics or electrical ratings. Selection should be based on the specific terminal type required for your application's wiring configuration.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed CBW57 variants are RoHS3 compliant, matching the environmental compliance status of the original CMB-203-11CNN-W-D.
Q: Do the substitute parts carry the same approval certifications?
A: All substitute parts carry UL1077 and UL1500 certifications, which are the core approvals required for thermal circuit breakers. The CBW57 series also includes cURus, IP 40, and SAE J1171 certifications, providing additional compliance coverage beyond the original part's certification set.
Q: What is the difference between the 32V DC rating of the original part and the 50V DC rating of substitutes?
A: The 50V DC rating in substitute parts represents an enhanced capability specification. A component rated for 50V DC can safely operate at 32V DC. This higher rating provides operational margin and does not compromise compatibility with existing 32V DC circuit designs.
Q: Are there inventory differences among the substitute parts?
A: Yes. Inventory levels vary across the CBW57 variants, ranging from 850 to 2458 pieces. CBW57-ES-20A-5H maintains the highest inventory at 2458 pieces, while CBW57-EL4-20A maintains the lowest at 850 pieces. Specific availability should be confirmed based on procurement timeline requirements.
Q: Can I use any CBW57 variant interchangeably with the others?
A: Electrically and thermally, all CBW57 variants are interchangeable. However, the terminal or connector configuration differences indicated by the suffix designations must match your application's wiring requirements. Verify the specific terminal type needed before selection.
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