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CMB-203-11DNB-B-A Equivalent & Substitute Parts
Part Overview
The CMB-203-11DNB-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 requirements, inventory availability, or specific application constraints while maintaining electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 20A |
| Voltage Rating - AC | 250V |
| Voltage Rating - DC | 32V |
| Breaker Type | Thermal |
| Mounting Type | Panel Mount |
| Actuator Type | Push to Reset |
| Number of Poles | 1 |
| Illumination | None |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the CMB-203-11DNB-B-A is determined by strict equivalence across the following critical parameters:
Mandatory Matching Parameters:
- Current Rating: 20A
- Voltage Rating - AC: 250V
- Breaker Type: Thermal
- Mounting Type: Panel Mount
- Actuator Type: Push to Reset
- Number of Poles: 1
- Illumination: None
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 32V DC requirement.
All substitute parts listed are manufactured by OptiFuse under the CBW57 series and meet these equivalence criteria. Each substitute maintains identical AC voltage rating, current rating, thermal breaker type, panel-mount configuration, and push-to-reset actuation.
Parameter Comparison
| Parameter | CMB-203-11DNB-B-A (Carling) | CBW57-EJ-20A (OptiFuse) | CBW57-EL4-20A (OptiFuse) | CBW57-ES-20A (OptiFuse) | CBW57-ES-20A-5H (OptiFuse) | CBW57-ES-20A-5X (OptiFuse) | CBW57-HS-20A-5X (OptiFuse) | CBW57-HS-20A-C (OptiFuse) | CBW57-PB-20A-WX (OptiFuse) | CBW57-PF-20A-5X (OptiFuse) | CBW57-PL-20A-5X (OptiFuse) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Breaker Type | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal |
| 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 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and environmental regulatory adherence. The OptiFuse CBW57 series substitutes carry regulatory approvals including cURus, UL 1077, and UL 1500 certifications, which align with the Carling Technologies CMB-203-11DNB-B-A approval agencies (CE, cUL, TUV, UL1077, UL1500).
The primary distinction among substitute options relates to connector or terminal configuration, indicated by the suffix designations (EJ, EL4, ES, HS, PB, PF, PL). These designations reflect mechanical interface variations rather than electrical performance differences. Selection among the CBW57 variants should be based on panel-mount terminal compatibility requirements specific to the application.
The elevated DC voltage rating (50V) of OptiFuse substitutes compared to the original 32V DC specification provides enhanced margin for DC applications without compromising AC performance. This characteristic makes the substitutes suitable for applications operating at or below the original 32V DC specification.
Frequently Asked Questions (FAQ)
Q: Can CBW57 series breakers directly replace the CMB-203-11DNB-B-A in existing installations?
A: Yes, provided the terminal or connector configuration of the selected CBW57 variant matches the panel-mount interface of the original installation. All CBW57 substitutes maintain identical electrical ratings (20A, 250V AC, thermal type, push-to-reset actuation) and mounting classification.
Q: What is the significance of the different CBW57 suffix codes (EJ, ES, HS, PB, PF, PL)?
A: These suffixes denote variations in terminal or connector type for panel-mount applications. The electrical and thermal characteristics remain constant across all variants. Selection should be based on the specific terminal interface required by the application's panel-mount configuration.
Q: Why do OptiFuse substitutes have a 50V DC rating instead of 32V DC?
A: The 50V DC rating represents the maximum DC voltage capability of the OptiFuse design. This higher rating is fully compatible with applications specified for 32V DC operation, as the breaker can safely operate at voltages equal to or below its rated maximum.
Q: Are all listed CBW57 variants in stock?
A: Inventory levels vary by part number. CBW57-ES-20A-5H maintains the highest inventory at 2,458 pieces. Specific availability should be confirmed for the selected variant prior to procurement.
Q: Do the substitute parts carry the same regulatory certifications as the original CMB-203-11DNB-B-A?
A: The OptiFuse CBW57 series carries cURus, UL 1077, and UL 1500 certifications. While the specific certification bodies differ slightly from the original (which includes CE and TUV), the UL 1077 and UL 1500 certifications are common to both manufacturers, ensuring compatibility with applications requiring these standards.
Q: What packaging format are the substitute parts supplied in?
A: All listed OptiFuse CBW57 substitutes are supplied in Bulk packaging, consistent with industrial component distribution standards.
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