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CMBA-033-NNFNN-B-A Circuit Breaker Equivalent & Substitute Parts
Part Overview
The CMBA-033-NNFNN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 3A 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 to provide alternative sourcing options when the primary part is unavailable or when design flexibility permits equivalent component selection.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Breaker Type | Thermal |
| Current Rating | 3A |
| 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
Substitute parts for the CMBA-033-NNFNN-B-A are qualified based on matching the following critical parameters: 3A current rating, 250V AC voltage rating, push-to-reset actuation, single-pole configuration, panel-mount installation, and thermal breaker type. All identified substitutes are manufactured by OptiFuse under the CBW57 series and maintain identical AC voltage ratings and current specifications. The DC voltage rating for substitute parts is 50V, which exceeds the 32V DC specification of the primary part, providing enhanced capability in DC applications. All substitutes maintain ROHS3 compliance and active product status, ensuring regulatory alignment and continued availability.
Parameter Comparison
| Parameter | CMBA-033-NNFNN-B-A (Carling) | CBW57-EJ-3A (OptiFuse) | CBW57-EL4-3A (OptiFuse) | CBW57-ES-3A (OptiFuse) | CBW57-PF-3A-5X (OptiFuse) | CBW57-PS-3A-1X (OptiFuse) |
|---|---|---|---|---|---|---|
| Breaker Type | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal |
| Current Rating (Amps) | 3A | 3A | 3A | 3A | 3A | 3A |
| Voltage Rating - AC | 250V | 250V | 250V | 250V | 250V | 250V |
| Voltage Rating - DC | 32V | 50V | 50V | 50V | 50V | 50V |
| Mounting Type | 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 |
| Number of Poles | 1 | 1 | 1 | 1 | 1 | 1 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
All five OptiFuse CBW57 series substitutes meet the electrical and mechanical requirements for direct replacement of the CMBA-033-NNFNN-B-A. Each substitute maintains active product status and ROHS3 compliance. The CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, providing regulatory coverage for industrial and automotive applications. The enhanced DC voltage rating of 50V on all substitutes provides additional safety margin in DC circuit applications compared to the primary part's 32V DC specification. Selection among the five substitute options should be based on packaging requirements, lead time, and inventory availability, as all electrical and mechanical parameters are functionally equivalent.
Frequently Asked Questions (FAQ)
Q: Can CBW57 series breakers directly replace the CMBA-033-NNFNN-B-A in existing designs?
A: Yes. All five CBW57 variants match the critical parameters: 3A current rating, 250V AC voltage rating, push-to-reset actuation, single-pole configuration, and panel-mount installation. The 50V DC rating on CBW57 parts exceeds the 32V DC specification, providing enhanced capability without compromising compatibility.
Q: What is the difference between the five CBW57 substitute part numbers?
A: The CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X variants differ in packaging configuration and connector type designations. All five maintain identical electrical specifications and thermal breaker characteristics. Selection depends on specific packaging and interface requirements for your application.
Q: Are all substitutes RoHS compliant?
A: Yes. All five OptiFuse CBW57 substitutes are ROHS3 compliant, matching the compliance status of the primary CMBA-033-NNFNN-B-A part.
Q: What certifications apply to the substitute parts?
A: CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. The primary part carries CE, cUL, TUV, UL1077, and UL1500 certifications. Both sets provide comprehensive regulatory coverage for industrial applications.
Q: Is the higher DC voltage rating on CBW57 parts a concern for compatibility?
A: No. A higher voltage rating indicates the component can safely operate at higher voltages. Since the application operates at 32V DC, the 50V DC rating on CBW57 parts provides additional safety margin and is fully compatible with existing circuit designs.
Q: What inventory levels are available for each substitute?
A: CBW57-EJ-3A: 1203 units; CBW57-EL4-3A: 1358 units; CBW57-ES-3A: 1289 units; CBW57-PF-3A-5X: 869 units; CBW57-PS-3A-1X: 1120 units. All parts are in stock as new original components.
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