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CLB-253-27ENN-B-A Circuit Breaker Equivalent & Substitute Parts
Part Overview
The CLB-253-27ENN-B-A is an active thermal circuit breaker manufactured by Carling Technologies, rated for 25A at 250V AC and 32V DC with push-to-reset panel mount actuation. This single-pole breaker is designed for overcurrent protection in AC and DC applications and carries multiple international approvals including CE, cUL, TUV, UL1077, and UL1500 certifications. The product is ROHS3 compliant and REACH unaffected.
Equivalent substitute parts are necessary when the original manufacturer part becomes unavailable, when supply chain optimization is required, or when alternative sourcing reduces procurement lead times while maintaining identical electrical and mechanical specifications.
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 thermal circuit breakers 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)
- Breaker Type: Thermal (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)
Allowable Variance:
- Voltage Rating - DC: The main part specifies 32V DC. Substitute parts rated at 50V DC are acceptable as this represents a higher voltage capability and provides enhanced performance margin in DC applications.
All substitute parts listed are manufactured by OptiFuse under the CBW57 series and maintain identical AC voltage ratings, current ratings, mounting configuration, and actuation mechanism. The DC voltage rating increase from 32V to 50V in substitute parts does not compromise compatibility and provides additional operational headroom.
Parameter Comparison
| Parameter | CLB-253-27ENN-B-A (Main) | CBW57-EJ-25A | CBW57-ES-25A | CBW57-ES-25A-5H | CBW57-PB-25A-5X | CBW57-PS-25A | CBW57-PS-25A-5X | CBW57-PS-25A-5XD |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Carling Technologies | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse |
| Series | CLB | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 |
| 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 continued availability and environmental regulatory adherence. The CBW57 series from OptiFuse provides direct functional equivalence to the CLB-253-27ENN-B-A across all critical electrical parameters.
Compliance Considerations:
The main part CLB-253-27ENN-B-A carries approvals from CE, cUL, TUV, UL1077, and UL1500. Substitute parts from the CBW57 series carry approvals from cURus, IP 40, SAE J1171, UL 1077, and UL 1500. Both product families meet UL 1077 and UL 1500 standards for thermal circuit breakers. The substitute parts include additional certifications (cURus, SAE J1171) and IP 40 rating, indicating enhanced environmental protection classification.
DC Voltage Rating Enhancement:
The increase in DC voltage rating from 32V to 50V in all substitute parts represents a performance enhancement rather than a limitation. This higher rating ensures the breaker operates within safe margins in DC applications and does not restrict use in 32V DC circuits.
Inventory Availability:
All substitute parts are in active stock with quantities ranging from 764 to 1681 pieces, providing reliable supply chain access compared to the main part inventory of 989 pieces.
Frequently Asked Questions (FAQ)
Q: Can CBW57 series breakers directly replace CLB-253-27ENN-B-A in existing applications?
A: Yes. All CBW57 substitute parts match the critical electrical specifications: 25A current rating, 250V AC voltage rating, thermal breaker type, panel mount configuration, and push-to-reset actuation. The higher 50V DC rating in substitute parts does not prevent operation in 32V DC circuits.
Q: What is the significance of the different part number suffixes in the CBW57 series (EJ, ES, ES-5H, PB-5X, PS, PS-5X, PS-5XD)?
A: The suffixes indicate internal design variations or packaging configurations within the CBW57 series. All variants listed maintain identical electrical ratings and mechanical mounting specifications required for substitution.
Q: Are there any compliance differences between the main part and substitute parts?
A: Both the main part and substitute parts are ROHS3 compliant and carry relevant UL certifications. Substitute parts include additional certifications (cURus, SAE J1171, IP 40) that provide expanded approval scope. The main part carries CE and TUV approvals; substitute parts carry cURus approval. Applications requiring specific regional certifications should be verified against end-use requirements.
Q: Why do substitute parts have a higher DC voltage rating (50V vs. 32V)?
A: The 50V DC rating in substitute parts represents a design enhancement that provides additional operational margin. This higher rating is fully compatible with 32V DC applications and does not introduce any compatibility issues.
Q: What is the REACH status of all parts?
A: The main part CLB-253-27ENN-B-A is REACH Unaffected. Substitute parts CBW57-ES-25A-5H, CBW57-PS-25A, and CBW57-PS-25A-5X are also REACH Unaffected. The remaining substitute parts do not specify REACH status in the provided data.
Q: Are all substitute parts available in bulk packaging?
A: Yes. All substitute parts are supplied in bulk packaging, consistent with the main part packaging specification.
Q: Which substitute part has the highest inventory availability?
A: CBW57-PS-25A has the highest inventory with 1681 pieces in stock, followed by CBW57-ES-25A with 1612 pieces.
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