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CMB-103-12H3N-B-A Equivalent & Substitute Parts
Part Overview
The CMB-103-12H3N-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 10A 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 necessary when the primary part is unavailable from inventory or when design requirements call for alternative connector configurations or mounting variants within the same electrical specification range.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CMB-103-12H3N-B-A |
| Manufacturer | Carling Technologies |
| Series | CMB |
| Breaker Type | Thermal |
| Current Rating | 10A |
| Voltage Rating - AC | 250V |
| Voltage Rating - DC | 32V |
| Mounting Type | Panel Mount |
| Actuator Type | Push to Reset |
| Number of Poles | 1 |
| Illumination | None |
| Product Status | Active |
| RoHS Status | ROHS3 Compliant |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitution of the CMB-103-12H3N-B-A is determined by strict equivalence across the following critical parameters:
Mandatory Matching Parameters:
- Current Rating: 10A
- Voltage Rating - AC: 250V
- Mounting Type: Panel Mount
- Breaker Type: Thermal
- Actuator Type: Push to Reset
- Number of Poles: 1
- Illumination: None
Allowable Variation:
- Voltage Rating - DC: The CMB-103-12H3N-B-A operates at 32V DC. All listed substitute parts from OptiFuse operate at 50V DC, which represents a higher DC voltage capability and remains compatible for applications requiring 32V DC operation.
All substitute parts listed are manufactured by OptiFuse under the CBW57 series. Each substitute maintains identical AC voltage, current rating, mounting configuration, and actuation method. The DC voltage rating differential does not restrict substitution, as the higher DC rating of substitute parts accommodates the original specification.
Parameter Comparison
| Parameter | CMB-103-12H3N-B-A | CBW57-EJ-10A | CBW57-EL4-10A | CBW57-ES-10A-5H | CBW57-PB-10A-5X | CBW57-PB-10A-X | CBW57-PF-10A-5X | CBW57-PL-10A-5X | CBW57-PS-10A | CBW57-PS-10A-1X | CBW57-PS-10A-5X |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Carling Technologies | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse |
| Series | CMB | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 |
| Breaker Type | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal |
| Current Rating (Amps) | 10A | 10A | 10A | 10A | 10A | 10A | 10A | 10A | 10A | 10A | 10A |
| 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 |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | Not Specified | Not Specified | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original CMB-103-12H3N-B-A. The OptiFuse CBW57 series substitutes carry certifications including cURus, IP 40, SAE J1171, UL 1077, and UL 1500, providing equivalent or enhanced approval coverage compared to the original part's CE, cUL, TUV, UL1077, and UL1500 certifications.
The primary distinction among substitute parts lies in connector configuration and packaging variants, denoted by the suffix codes (EJ, EL4, ES, PB, PF, PL, PS). These variants maintain identical electrical specifications and thermal protection characteristics. Selection among substitutes should be based on mechanical interface requirements specific to the application.
CBW57-PS-10A and CBW57-PS-10A-5X offer the highest inventory availability (4730 and 5818 units respectively), providing supply chain advantages for high-volume applications. All substitutes are supplied in Bulk packaging and maintain Moisture Sensitivity Level 1 (Unlimited), indicating no special storage or handling requirements.
Frequently Asked Questions (FAQ)
Q: Can OptiFuse CBW57 series parts directly replace the Carling Technologies CMB-103-12H3N-B-A?
A: Yes. All listed OptiFuse CBW57 variants are parametric equivalents. They maintain identical current rating (10A), AC voltage rating (250V), mounting type (Panel Mount), breaker type (Thermal), actuator type (Push to Reset), and pole configuration (1-pole). The higher DC voltage rating (50V versus 32V) of OptiFuse parts does not restrict substitution for applications requiring 32V DC operation.
Q: What is the significance of the suffix codes in OptiFuse part numbers (EJ, EL4, ES, PB, PF, PL, PS)?
A: Suffix codes denote connector configuration and mechanical interface variants. All variants listed maintain identical electrical and thermal specifications. Selection should be based on the specific connector type required by the application's panel interface.
Q: Are there compliance or certification differences between the original part and substitutes?
A: The original CMB-103-12H3N-B-A carries CE, cUL, TUV, UL1077, and UL1500 certifications. OptiFuse CBW57 substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both meet UL 1077 and UL 1500 standards. The OptiFuse parts include additional IP 40 rating and SAE J1171 compliance, providing equivalent or enhanced regulatory coverage.
Q: What is the inventory status of substitute parts?
A: All substitute parts are in stock. CBW57-PS-10A-5X offers the highest availability at 5818 units, followed by CBW57-PS-10A at 4730 units. Remaining variants range from 701 to 3044 units in inventory.
Q: Does the DC voltage rating difference affect thermal protection performance?
A: No. The thermal protection mechanism operates independently of DC voltage rating. The 50V DC rating of OptiFuse substitutes represents enhanced capability and does not alter the thermal trip characteristics that protect against overcurrent conditions.
Q: Are there packaging or storage considerations for substitute parts?
A: All substitute parts are supplied in Bulk packaging with Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture control or storage requirements during handling and installation.
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