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CLB-203-11B5B-R-A Equivalent & Substitute Parts
Part Overview
The CLB-203-11B5B-R-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 20A 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 AC and DC applications requiring thermal response characteristics. Equivalent substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits alternative qualified components within the same electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CLB-203-11B5B-R-A |
| Manufacturer | Carling Technologies |
| Series | CLB |
| Breaker Type | Thermal |
| Current Rating | 20A |
| 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 |
| Approval Agencies | CE, cUL, TUV, UL1077, UL1500 |
Substitute Part Grouping Explanation
Substitute parts for the CLB-203-11B5B-R-A are qualified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:
Critical Matching Parameters:
- Current Rating: 20A (exact match required)
- Voltage Rating - AC: 250V (exact match required)
- Mounting Type: Panel Mount (exact match required)
- Breaker Type: Thermal (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 maintains backward compatibility in applications requiring 32V DC operation.
All substitute parts listed are manufactured by OptiFuse under the CBW57 series and maintain Active product status with ROHS3 compliance and equivalent regulatory approvals (cURus, UL 1077, UL 1500).
Parameter Comparison
| Parameter | CLB-203-11B5B-R-A (Main) | CBW57-EJ-20A | CBW57-EL4-20A | CBW57-ES-20A | CBW57-ES-20A-5H | CBW57-ES-20A-5X | CBW57-HS-20A-5X | CBW57-HS-20A-C | CBW57-PB-20A-WX | CBW57-PF-20A-5X | CBW57-PL-20A-5X |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Carling Technologies | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse |
| Current Rating (Amps) | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A |
| 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 |
| Breaker Type | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal |
| 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 |
Engineering Selection Recommendations
All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original CLB-203-11B5B-R-A. The OptiFuse CBW57 series components carry equivalent safety certifications including cURus, UL 1077, and UL 1500 approvals, which overlap with the original part's CE, cUL, TUV, UL1077, and UL1500 certifications.
The primary electrical distinction is the DC voltage rating: substitute parts are rated for 50V DC compared to the original 32V DC specification. This higher rating provides enhanced capability for DC applications while maintaining full compatibility with 32V DC circuit requirements. All substitute parts share identical AC voltage ratings (250V), current ratings (20A), mounting configuration (panel mount), and actuation mechanism (push to reset).
Inventory availability varies across substitute options, with quantities ranging from 850 to 2458 pieces in stock. Selection among equivalent parts may be based on packaging requirements, specific connector configurations denoted by part number suffixes, or supply chain considerations.
Frequently Asked Questions (FAQ)
Q: Can CBW57 series parts directly replace the CLB-203-11B5B-R-A?
A: Yes. All listed CBW57 series parts meet the critical electrical and mechanical parameters: 20A current rating, 250V AC voltage rating, panel mount configuration, thermal breaker type, push-to-reset actuation, and single-pole design. The higher 50V DC rating of substitute parts is compatible with 32V DC applications.
Q: What is the significance of the different part number suffixes in the CBW57 series?
A: The suffixes (EJ, EL4, ES, HS, PB, PF, PL) denote variations in connector type, terminal configuration, or mechanical interface. All variants listed maintain identical electrical specifications and are functionally equivalent for the stated 20A, 250V AC, 32V DC application.
Q: Are there any compliance or certification differences between the main part and substitutes?
A: The original CLB-203-11B5B-R-A carries CE, cUL, TUV, UL1077, and UL1500 approvals. All substitute CBW57 parts carry cURus, UL 1077, and UL 1500 certifications. Both sets include UL 1077 and UL 1500 approvals, which are the primary safety standards for thermal circuit breakers. Both the main part and substitutes are ROHS3 compliant.
Q: Is the 50V DC rating of substitute parts a limitation or advantage?
A: The 50V DC rating represents an advantage. It provides higher voltage capability than the original 32V DC specification while maintaining full backward compatibility. Applications requiring 32V DC operation function identically with either the original or substitute parts.
Q: What packaging format is used for the substitute parts?
A: All listed substitute parts are supplied in Bulk packaging. The original part packaging format is not specified in the provided data.
Q: Can I mix CLB and CBW57 series breakers in the same panel?
A: Yes, provided all electrical and mechanical parameters match the circuit requirements. Both series are thermal, single-pole, 20A, 250V AC, push-to-reset panel-mount breakers with identical functional characteristics for the specified ratings.
Q: Which substitute part should I select if multiple options are available?
A: Selection depends on specific application requirements not covered by the core electrical parameters. Connector type, terminal configuration, and mechanical interface variations are denoted by part number suffixes. Consult application documentation or connector specifications to determine the appropriate suffix variant.
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