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CMB-203-11CNN-B-A/20 Equivalent & Substitute Parts
Part Overview
The CMB-203-11CNN-B-A/20 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.
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 | 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 |
| 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 CMB-203-11CNN-B-A/20 establishes the baseline specification: 20A current rating, 250V AC voltage rating, 32V DC voltage rating, single-pole configuration, panel-mount installation, and push-to-reset actuation.
All substitute parts listed maintain these core parameters. OptiFuse CBW57 series components satisfy substitution criteria through identical current ratings (20A), AC voltage ratings (250V), DC voltage ratings (50V—which exceeds the 32V requirement), mounting type (panel mount), actuator type (push to reset), pole count (1), and RoHS3 compliance status.
The DC voltage rating differential (50V on substitutes versus 32V on the primary part) represents an uprated specification that does not restrict substitution, as higher voltage ratings provide equivalent or superior performance in lower-voltage applications.
Parameter Comparison
| Parameter | CMB-203-11CNN-B-A/20 | 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 |
| 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, ensuring continued availability and manufacturer support. The CMB-203-11CNN-B-A/20 carries certifications including CE, cUL, TUV, UL1077, and UL1500. OptiFuse CBW57 series substitutes carry certifications including cURus, IP 40, SAE J1171, UL 1077, and UL 1500, with UL 1077 and UL 1500 providing direct alignment with the primary part's certification framework.
All substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance profile of the primary component. The CBW57 series components demonstrate higher DC voltage ratings (50V) compared to the primary part (32V), providing enhanced performance margin in DC applications.
Selection among substitute parts should be based on availability, lead time requirements, and any design-specific connector or terminal configurations indicated by part number suffixes. All listed substitutes are electrically and mechanically interchangeable within the specified parameters.
Frequently Asked Questions (FAQ)
Q: What determines whether an OptiFuse CBW57 part can substitute for the CMB-203-11CNN-B-A/20?
A: Substitution is determined by matching core electrical parameters: 20A current rating, 250V AC voltage rating, 32V DC voltage rating (or higher), single-pole configuration, panel-mount installation, push-to-reset actuation, and absence of illumination. All listed CBW57 variants meet these criteria.
Q: Why do the OptiFuse substitutes have a 50V DC rating when the primary part is rated 32V DC?
A: The 50V DC rating on CBW57 parts represents an uprated specification. Higher voltage ratings do not restrict substitution in lower-voltage applications; they indicate the component can operate safely at higher voltages, providing additional performance margin.
Q: Are there mechanical differences between the CMB-203-11CNN-B-A/20 and CBW57 substitutes?
A: Both the primary part and all listed substitutes are panel-mount thermal circuit breakers with push-to-reset actuation and single-pole configuration. Mechanical compatibility is maintained across all listed parts for standard panel-mount installations.
Q: Do all CBW57 variants carry the same regulatory certifications?
A: All listed CBW57 substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. The primary part carries CE, cUL, TUV, UL1077, and UL1500 certifications. UL 1077 and UL 1500 certifications are common to both, providing regulatory alignment for most applications.
Q: What is the significance of the part number suffixes in the CBW57 series?
A: Part number suffixes (such as -EJ, -ES, -HS, -PB, -PF, -PL) indicate variations in connector type, terminal configuration, or housing material. These suffixes do not affect the electrical performance parameters; selection should be based on mechanical interface requirements specific to the application.
Q: Can I use any of the listed CBW57 parts as a direct drop-in replacement?
A: All listed CBW57 parts are electrically equivalent and mechanically compatible for panel-mount installations. Confirmation of connector and terminal compatibility with existing wiring harnesses or PCB layouts is required before installation.
Q: What inventory levels are available for the substitute parts?
A: Inventory availability varies across the CBW57 variants, ranging from 850 to 2458 pieces in stock. CBW57-ES-20A-5H maintains the highest inventory level at 2458 pieces, while CBW57-EL4-20A maintains 850 pieces.
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