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CLB-033-11B2B-B-A Circuit Breaker Equivalent & Substitute Parts
Part Overview
The CLB-033-11B2B-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 3A at 250V AC and 32V DC with push-to-reset panel mount actuation. This single-pole breaker is designed for overcurrent protection in low-voltage AC and DC applications and maintains active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards.
Substitute parts become necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility permits selection from alternative manufacturers while maintaining equivalent electrical and mechanical performance. The CLB-033-11B2B-B-A has five parametric equivalents available from OptiFuse within the CBW57 series, all sharing identical current ratings, voltage specifications, and mounting configurations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Breaker Type | Thermal |
| Current Rating | 3A |
| Voltage Rating - AC | 250V |
| Voltage Rating - DC | 32V |
| Actuator Type | Push to Reset |
| Number of Poles | 1 |
| Mounting Type | Panel Mount |
| Illumination | None |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
All five substitute parts from OptiFuse (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X) are classified as parametric equivalents to the CLB-033-11B2B-B-A based on the following matching criteria:
Matching Electrical Parameters:
- Current Rating: 3A (identical)
- Voltage Rating - AC: 250V (identical)
- Actuator Type: Push to Reset (identical)
- Number of Poles: 1 (identical)
- Breaker Type: Thermal (identical)
Matching Mechanical Parameters:
- Mounting Type: Panel Mount (identical)
- Illumination: None (identical)
Compliance Alignment:
- All substitute parts are ROHS3 Compliant
- All substitute parts are REACH Unaffected
- All substitute parts carry UL 1077 and UL 1500 certifications, which overlap with the main part's approval agencies
DC Voltage Consideration: The substitute parts are rated for 50V DC, which exceeds the main part's 32V DC rating. This represents an upward compatibility margin and does not restrict substitution in applications requiring 32V DC operation.
Parameter Comparison
| Parameter | CLB-033-11B2B-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 |
| 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 |
| Mounting Type | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount |
| Illumination | None | None | None | None | None | None |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected | REACH Unaffected |
| Series | CLB | CBW57 | CBW57 | CBW57 | CBW57 | CBW57 |
Engineering Selection Recommendations
All five OptiFuse CBW57 series substitute parts satisfy the electrical and mechanical requirements for direct substitution with the CLB-033-11B2B-B-A. Selection among the five variants should be based on the following factors:
Certification Alignment: The CLB-033-11B2B-B-A carries CE, cUL, TUV, UL1077, and UL1500 approvals. All substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. The overlap in UL 1077 and UL 1500 certifications ensures compliance with the primary regulatory framework. Applications requiring CE or TUV certification should confirm that the substitute part's cURus and SAE J1171 certifications satisfy regional requirements.
Product Status: All substitute parts maintain active product status, ensuring continued availability and manufacturing support.
Inventory Availability: The substitute parts demonstrate strong inventory levels: CBW57-EJ-3A (1203 pcs), CBW57-EL4-3A (1358 pcs), CBW57-ES-3A (1289 pcs), CBW57-PF-3A-5X (869 pcs), and CBW57-PS-3A-1X (1120 pcs). These quantities exceed the main part inventory of 863 pcs.
DC Voltage Rating: The 50V DC rating of all substitute parts provides operational margin above the 32V DC requirement of the main part, supporting applications across the full 32V DC operating range without derating.
Moisture Sensitivity: All substitute parts carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity constraints during storage or handling.
Frequently Asked Questions (FAQ)
Q: Can CBW57 series breakers directly replace the CLB-033-11B2B-B-A in existing designs?
A: Yes. The CBW57 series substitute parts match all critical electrical parameters (3A current rating, 250V AC, push-to-reset actuation, single-pole configuration) and mechanical parameters (panel mount, no illumination). The identical breaker type (thermal) and actuator mechanism ensure functional equivalence in overcurrent protection applications.
Q: What is the significance of the higher 50V DC rating on the substitute parts?
A: The substitute parts are rated for 50V DC operation, compared to the main part's 32V DC rating. This represents an upward compatibility margin. Applications operating at 32V DC or lower will function within the substitute part's rated envelope without performance degradation or derating requirements.
Q: Are there any certification differences between the main part and substitutes?
A: The main part carries CE, cUL, TUV, UL1077, and UL1500 certifications. The substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both sets include UL 1077 and UL 1500 approvals. Applications requiring CE or TUV certification should verify that cURus and SAE J1171 certifications satisfy regional compliance requirements.
Q: Why are there five different part numbers within the CBW57 series?
A: The five part numbers (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, CBW57-PS-3A-1X) represent different connector or terminal configurations within the CBW57 base series. All five variants share identical electrical ratings and thermal protection characteristics. Selection among variants depends on the specific terminal or connector interface required by the application.
Q: What is the RoHS and REACH compliance status of the substitute parts?
A: All substitute parts are ROHS3 Compliant and REACH Unaffected, matching the compliance profile of the main part. This ensures compatibility with environmental regulations across EU and international markets.
Q: Are there inventory advantages to selecting a substitute part?
A: Yes. The substitute parts demonstrate higher inventory levels than the main part. CBW57-EL4-3A offers the highest availability at 1358 pcs, followed by CBW57-ES-3A at 1289 pcs. These quantities support applications with extended procurement windows or high-volume requirements.
Q: What is the MSL rating of the substitute parts?
A: All substitute parts carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity constraints. Components can be stored and handled without time-dependent moisture absorption limitations, simplifying supply chain management.
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