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CMB-033-27G3N-B-A Circuit Breaker Equivalent & Substitute Parts
Part Overview
The CMB-033-27G3N-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 industrial and commercial 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 inventory requirements necessitate alternative manufacturers.
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 CMB-033-27G3N-B-A are qualified based on electrical and mechanical parameter equivalence. All identified substitutes maintain the following critical parameters:
- Current Rating: 3A
- Voltage Rating - AC: 250V
- Mounting Type: Panel Mount
- Breaker Type: Thermal
- Actuator Type: Push to Reset
- Number of Poles: 1
- RoHS3 Compliance
The substitute parts are manufactured by OptiFuse under the CBW57 series. These parts operate at a higher DC voltage rating (50V DC versus 32V DC on the main part), which represents an upward-compatible specification. All substitutes carry equivalent regulatory approvals including UL 1077 and UL 1500 certifications, ensuring functional interchangeability in applications requiring the specified current and AC voltage ratings.
Parameter Comparison
| Parameter | CMB-033-27G3N-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 |
| Illumination | None | None | None | None | None | None |
| 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 are qualified alternatives to the CMB-033-27G3N-B-A based on electrical parameter equivalence and regulatory compliance. Each substitute maintains active product status and ROHS3 compliance.
The CBW57 series parts carry UL 1077 and UL 1500 certifications, which align with the primary part's approval agencies. The higher DC voltage rating (50V versus 32V) on all substitutes provides enhanced capability for DC applications without compromising AC performance at the specified 250V rating.
Selection among the five substitute options should be based on availability and packaging requirements, as all five parts are electrically and mechanically equivalent for the specified application parameters.
Frequently Asked Questions (FAQ)
Q: Can CBW57 series breakers directly replace the CMB-033-27G3N-B-A in existing installations?
A: Yes. All five CBW57 variants maintain identical current rating (3A), AC voltage rating (250V), mounting type (panel mount), actuator type (push to reset), and pole configuration (1-pole). The higher DC voltage rating on CBW57 parts (50V versus 32V) represents an upward-compatible specification.
Q: What is the significance of the different CBW57 part number suffixes (EJ, EL4, ES, PF-5X, PS-1X)?
A: The suffixes denote different connector or terminal configurations within the CBW57 series. All variants maintain identical electrical specifications for current, voltage, and breaker function. Selection should be based on terminal type compatibility with the application circuit.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All five OptiFuse CBW57 substitutes are ROHS3 compliant, matching the compliance status of the CMB-033-27G3N-B-A.
Q: Do the substitute parts carry equivalent regulatory certifications?
A: The CBW57 series carries UL 1077 and UL 1500 certifications, which are present in the CMB-033-27G3N-B-A approval list. The CBW57 series also carries cURus and SAE J1171 certifications.
Q: What is the inventory status of substitute parts?
A: CBW57-EL4-3A: 1358 units; CBW57-ES-3A: 1289 units; CBW57-PS-3A-1X: 1120 units; CBW57-EJ-3A: 1203 units; CBW57-PF-3A-5X: 869 units. All substitutes are available as new original stock.
Q: Is the DC voltage difference between the main part (32V) and substitutes (50V) a limiting factor?
A: No. The higher DC voltage rating on substitute parts indicates enhanced DC capability. Applications operating at or below 32V DC will function within the rated specifications of the CBW57 substitutes.
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