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CMB-043-11CNN-W-A Circuit Breaker Equivalent & Substitute Parts
Part Overview
The CMB-043-11CNN-W-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 4A at 250V AC and 32V DC. This single-pole, panel-mount breaker features push-to-reset actuation and is designed for overcurrent protection in low-voltage applications. The part maintains Active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards. Substitute parts are identified when inventory constraints, lead time requirements, or supply chain considerations necessitate alternative sourcing while maintaining equivalent electrical and mechanical performance.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Breaker Type | Thermal |
| Current Rating | 4A |
| Voltage Rating - AC | 250V |
| Voltage Rating - DC | 32V |
| Mounting Type | Panel Mount |
| Actuator Type | Push to Reset |
| Number of Poles | 1 |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the CMB-043-11CNN-W-A are qualified based on strict equivalence across the following critical parameters: breaker type (thermal), current rating (4A), AC voltage rating (250V), mounting configuration (panel mount), actuator mechanism (push to reset), and pole count (single pole). Both identified substitutes—CBW57-ES-4A and CBW57-EJ-4A from OptiFuse—satisfy these core electrical and mechanical requirements. The DC voltage rating for substitute parts is specified at 50V, which exceeds the 32V DC requirement of the primary part, establishing compatibility for DC applications within the original specification envelope. All substitute candidates maintain ROHS3 compliance and active product status.
Parameter Comparison
| Parameter | CMB-043-11CNN-W-A (Carling) | CBW57-ES-4A (OptiFuse) | CBW57-EJ-4A (OptiFuse) |
|---|---|---|---|
| Manufacturer | Carling Technologies | OptiFuse | OptiFuse |
| Breaker Type | Thermal | Thermal | Thermal |
| Current Rating (Amps) | 4A | 4A | 4A |
| Voltage Rating - AC | 250V | 250V | 250V |
| Voltage Rating - DC | 32V | 50V | 50V |
| Mounting Type | Panel Mount | Panel Mount | Panel Mount |
| Actuator Type | Push to Reset | Push to Reset | Push to Reset |
| Number of Poles | 1 | 1 | 1 |
| Illumination | None | None | None |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active |
Engineering Selection Recommendations
Both CBW57-ES-4A and CBW57-EJ-4A circuit breakers function as direct electrical and mechanical equivalents to the CMB-043-11CNN-W-A. Selection between these options is determined by inventory availability and supply chain logistics rather than technical performance differentiation. The CBW57-ES-4A maintains higher inventory levels (2,895 pieces) compared to CBW57-EJ-4A (1,273 pieces), supporting expedited procurement timelines. Both substitutes carry ROHS3 compliance and active product designation. OptiFuse substitutes hold UL 1077 and UL 1500 certifications, aligning with the primary part's regulatory framework. The elevated DC voltage rating (50V versus 32V) on substitute parts provides additional operational margin for DC circuit applications without compromising AC performance specifications.
Frequently Asked Questions (FAQ)
Q: Can CBW57-ES-4A and CBW57-EJ-4A be used interchangeably with CMB-043-11CNN-W-A?
A: Yes. Both OptiFuse parts satisfy the electrical requirements (4A, 250V AC, 32V DC minimum) and mechanical specifications (panel mount, push to reset, single pole, thermal operation) of the Carling Technologies breaker. The 50V DC rating on substitute parts exceeds the 32V DC requirement, establishing full compatibility.
Q: What is the difference between CBW57-ES-4A and CBW57-EJ-4A?
A: Both parts share identical electrical and mechanical specifications. The designations reflect internal OptiFuse product line differentiation. Selection is based on inventory availability and delivery requirements.
Q: Are the substitute parts certified to the same standards as the CMB-043-11CNN-W-A?
A: Both substitute parts hold UL 1077 and UL 1500 certifications, matching the primary part's regulatory compliance. The primary part additionally carries CE, cUL, and TUV approvals. Verification of specific certification requirements for your application is necessary prior to design implementation.
Q: Does the higher DC voltage rating on substitute parts affect circuit compatibility?
A: No. A higher voltage rating indicates the component can safely operate at voltages up to that specification. The 50V DC rating on OptiFuse substitutes is compatible with applications requiring 32V DC or lower.
Q: What packaging format is available for these circuit breakers?
A: All parts—primary and substitutes—are supplied in Bulk packaging configuration.
Q: Are these parts RoHS compliant?
A: Yes. The CMB-043-11CNN-W-A and both substitute parts (CBW57-ES-4A and CBW57-EJ-4A) maintain ROHS3 compliance status.
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