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CMB-073-12H3N-B-A Equivalent & Substitute Parts
Part Overview
The CMB-073-12H3N-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 7A 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 certified to CE, cUL, TUV, UL1077, and UL1500 standards and is ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters are required for applications where the original part is unavailable or when design flexibility permits alternative manufacturers within the same functional specification.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Breaker Type | Thermal |
| Current Rating | 7A |
| Voltage Rating - AC | 250V |
| Voltage Rating - DC | 32V |
| Mounting Type | Panel Mount |
| Number of Poles | 1 |
| Actuator Type | Push to Reset |
| Illumination | None |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the CMB-073-12H3N-B-A are qualified based on the following critical parameters:
Electrical Equivalence:
- Current Rating: 7A (exact match required)
- Voltage Rating - AC: 250V (exact match required)
- Voltage Rating - DC: Minimum 32V (substitutes rated at 50V DC exceed minimum requirement)
Mechanical Equivalence:
- Breaker Type: Thermal (exact match required)
- Mounting Type: Panel Mount (exact match required)
- Number of Poles: 1 (exact match required)
- Actuator Type: Push to Reset (exact match required)
Compliance Equivalence:
- RoHS3 Compliant status (exact match required)
- Active product status (exact match required)
All four substitute parts listed (CBW57-HS-7A-5C, CBW57-ES-7A-5H, CBW57-EJ-7A, CBW57-EL4-7A) meet these criteria and are manufactured by OptiFuse within the CBW57 series.
Parameter Comparison
| Parameter | CMB-073-12H3N-B-A (Carling) | CBW57-HS-7A-5C (OptiFuse) | CBW57-ES-7A-5H (OptiFuse) | CBW57-EJ-7A (OptiFuse) | CBW57-EL4-7A (OptiFuse) |
|---|---|---|---|---|---|
| Breaker Type | Thermal | Thermal | Thermal | Thermal | Thermal |
| Current Rating (Amps) | 7A | 7A | 7A | 7A | 7A |
| Voltage Rating - AC | 250V | 250V | 250V | 250V | 250V |
| Voltage Rating - DC | 32V | 50V | 50V | 50V | 50V |
| Mounting Type | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount |
| Number of Poles | 1 | 1 | 1 | 1 | 1 |
| Actuator Type | Push to Reset | Push to Reset | Push to Reset | Push to Reset | Push to Reset |
| Illumination | None | None | None | None | None |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
All four OptiFuse CBW57 series substitutes maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance equivalent to the CMB-073-12H3N-B-A.
Certification Alignment: The CMB-073-12H3N-B-A carries CE, cUL, TUV, UL1077, and UL1500 certifications. The OptiFuse substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both sets include UL 1077 and UL 1500 standards. Applications requiring specific certification compliance (such as CE or TUV) must verify that the substitute part's certification portfolio meets system-level requirements.
DC Voltage Consideration: All substitute parts are rated for 50V DC, which exceeds the 32V DC requirement of the main part. This higher rating provides additional operational margin in DC applications.
Inventory Availability: CBW57-ES-7A-5H: 2482 units CBW57-EL4-7A: 1998 units CBW57-EJ-7A: 1884 units CBW57-HS-7A-5C: 1197 units
Frequently Asked Questions (FAQ)
Q: Can OptiFuse CBW57 series breakers directly replace the Carling CMB-073-12H3N-B-A?
A: Yes. All four OptiFuse CBW57 variants meet the electrical and mechanical parameters of the CMB-073-12H3N-B-A: 7A current rating, 250V AC, panel-mount thermal design, single-pole configuration, and push-to-reset actuation. The 50V DC rating of the substitutes exceeds the 32V DC requirement.
Q: What is the difference between the four OptiFuse substitute part numbers?
A: CBW57-HS-7A-5C, CBW57-ES-7A-5H, CBW57-EJ-7A, and CBW57-EL4-7A are all variants within the CBW57 series with identical electrical and mechanical specifications. The alphanumeric suffixes denote internal design or packaging variations. All four are functionally equivalent for the stated application parameters.
Q: Are there any certification differences between the main part and substitutes?
A: The CMB-073-12H3N-B-A includes CE and TUV certifications, while the OptiFuse substitutes do not list these specific certifications. Both include UL 1077 and UL 1500. Applications requiring CE or TUV certification must confirm that system-level certification permits use of components with alternative certification profiles.
Q: Is the higher DC voltage rating of the substitutes a concern?
A: No. A higher voltage rating provides additional safety margin and does not create compatibility issues in applications rated at 32V DC or lower. The substitute parts operate safely across the full voltage range of the original part.
Q: What packaging format are the substitute parts supplied in?
A: All four OptiFuse substitutes are supplied in Bulk packaging, consistent with industrial component distribution standards.
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