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CLB-253-12CNN-B-A Equivalent & Substitute Parts
Part Overview
The CLB-253-12CNN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 25A 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 designed for overcurrent protection in industrial and commercial applications requiring thermal response characteristics.
Substitute parts are necessary when the original CLB-253-12CNN-B-A becomes unavailable due to inventory constraints, supply chain disruptions, or end-of-life status. Alternative models meeting identical electrical and mechanical specifications ensure continuity of equipment operation and maintenance protocols.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Breaker Type | Thermal |
| Current Rating | 25A |
| 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
Substitution eligibility for the CLB-253-12CNN-B-A is determined by strict equivalence across the following parameters:
Critical Matching Parameters:
- Current Rating: 25A (exact match required)
- Voltage Rating - AC: 250V (exact match required)
- Mounting Type: Panel Mount (exact match required)
- Actuator Type: Push to Reset (exact match required)
- Number of Poles: 1 (exact match required)
- Breaker Type: Thermal (exact match required)
Allowable Variance:
- Voltage Rating - DC: The CLB-253-12CNN-B-A operates at 32V DC. Substitute parts rated at 50V DC are acceptable, as higher DC voltage ratings provide equivalent or superior performance in applications not exceeding the original specification.
All substitute parts listed are manufactured by OptiFuse under the CBW57 series and maintain Active product status with ROHS3 compliance. Each substitute part satisfies the electrical and mechanical requirements for direct replacement in panel-mount thermal protection applications.
Parameter Comparison
| Parameter | CLB-253-12CNN-B-A (Carling) | CBW57-EJ-25A (OptiFuse) | CBW57-ES-25A (OptiFuse) | CBW57-ES-25A-5H (OptiFuse) | CBW57-PB-25A-5X (OptiFuse) | CBW57-PS-25A (OptiFuse) | CBW57-PS-25A-5X (OptiFuse) | CBW57-PS-25A-5XD (OptiFuse) |
|---|---|---|---|---|---|---|---|---|
| Breaker Type | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal |
| Current Rating (Amps) | 25A | 25A | 25A | 25A | 25A | 25A | 25A | 25A |
| Voltage Rating - AC | 250V | 250V | 250V | 250V | 250V | 250V | 250V | 250V |
| Voltage Rating - DC | 32V | 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 |
| 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 |
| Number of Poles | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Illumination | None | None | None | None | None | None | None | None |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original CLB-253-12CNN-B-A. The OptiFuse CBW57 series alternatives carry certifications including cURus, UL 1077, and UL 1500, which overlap with the original part's approval agencies (CE, cUL, TUV, UL1077, UL1500).
The primary distinction among substitute options lies in packaging and connector configurations, denoted by suffix variations (EJ, ES, ES-5H, PB-5X, PS, PS-5X, PS-5XD). These suffixes indicate different terminal or mounting interface designs. Selection should be based on mechanical compatibility with existing panel cutouts and terminal connection requirements.
All substitute parts are rated at 50V DC, which exceeds the original 32V DC specification. This higher rating does not compromise performance in applications operating at or below 32V DC and provides additional margin for transient voltage conditions.
Inventory availability across all substitute options ranges from 764 to 1681 pieces, indicating consistent supply across the CBW57 series.
Frequently Asked Questions (FAQ)
Q: Can OptiFuse CBW57 series breakers directly replace the Carling CLB-253-12CNN-B-A?
A: Yes, all listed OptiFuse CBW57 variants are direct electrical and mechanical equivalents. They match the 25A current rating, 250V AC voltage rating, panel-mount configuration, push-to-reset actuation, and single-pole design. The higher 50V DC rating of OptiFuse parts is compatible with applications rated at 32V DC or lower.
Q: What do the suffix designations (EJ, ES, ES-5H, PB-5X, PS, PS-5X, PS-5XD) indicate?
A: These suffixes denote variations in terminal configuration, connector type, or mounting interface design. Selection among these variants depends on compatibility with the specific panel cutout dimensions and terminal connection method required by the application. Mechanical interface specifications should be verified against installation requirements.
Q: Are all substitute parts ROHS3 compliant?
A: Yes, all listed OptiFuse CBW57 variants are ROHS3 compliant, matching the environmental compliance status of the original CLB-253-12CNN-B-A.
Q: What certifications do the OptiFuse substitutes carry?
A: OptiFuse CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. The original CLB-253-12CNN-B-A carries CE, cUL, TUV, UL1077, and UL1500 certifications. Both product lines meet UL 1077 and UL 1500 standards, ensuring functional equivalence for thermal circuit breaker applications.
Q: Why is the DC voltage rating higher on OptiFuse parts?
A: OptiFuse CBW57 series parts are rated at 50V DC compared to the original 32V DC rating. Higher voltage ratings indicate the component can safely operate at elevated voltages without performance degradation. In applications operating at 32V DC or lower, the 50V DC rating provides equivalent protection with additional safety margin.
Q: Which substitute part should be selected if the original CLB-253-12CNN-B-A is unavailable?
A: Selection among CBW57-EJ-25A, CBW57-ES-25A, CBW57-ES-25A-5H, CBW57-PB-25A-5X, CBW57-PS-25A, CBW57-PS-25A-5X, and CBW57-PS-25A-5XD depends on mechanical interface compatibility with the existing panel installation. All variants are electrically equivalent and carry equivalent certifications. Verify terminal configuration and mounting interface specifications against installation documentation.
Q: Are there inventory differences among the substitute options?
A: Inventory levels vary across the CBW57 variants, ranging from 764 to 1681 pieces. CBW57-PS-25A offers the highest availability at 1681 pieces, while CBW57-PB-25A-5X offers the lowest at 764 pieces. Availability should be confirmed at the time of procurement.
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