CLB-203-27ENN-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CLB-203-27ENN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 20A at 250V AC and 32V DC. This single-pole, panel-mount breaker features push-to-reset actuation and is designed for overcurrent protection in electrical systems. The part maintains active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate alternative manufacturers.

Key Parameters

Parameter	Value
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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CLB-203-27ENN-B-A are qualified based on electrical and mechanical parameter equivalence. All identified substitutes share the following critical parameters with the main part:

Matching Parameters:

Current Rating: 20A
Voltage Rating - AC: 250V
Mounting Type: Panel Mount
Breaker Type: Thermal
Actuator Type: Push to Reset
Number of Poles: 1
Illumination: None
RoHS Status: ROHS3 Compliant

Parameter Variance:

Voltage Rating - DC: Substitute parts are rated for 50V DC, compared to the main part's 32V DC rating. This represents an increased DC voltage capability and does not restrict substitution in applications requiring 32V DC operation.

All substitute parts are manufactured by OptiFuse under the CBW57 series and maintain active product status with equivalent regulatory approvals (cURus, UL 1077, UL 1500).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Mounting Type	Breaker Type	Actuator Type	Poles	RoHS Status	Product Status
CLB-203-27ENN-B-A	Carling Technologies	20	250	32	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-EJ-20A	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-EL4-20A	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-ES-20A	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-ES-20A-5H	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-ES-20A-5X	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-HS-20A-5X	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-HS-20A-C	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-PB-20A-WX	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-PF-20A-5X	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active
CBW57-PL-20A-5X	OptiFuse	20	250	50	Panel Mount	Thermal	Push to Reset	1	ROHS3 Compliant	Active

Engineering Selection Recommendations

All identified substitute parts maintain active product status and comply with ROHS3 requirements. The CBW57 series from OptiFuse provides functional equivalence across thermal protection, current handling, AC voltage rating, and mechanical mounting characteristics.

The primary distinction between the main part and substitutes is the DC voltage rating differential. The CLB-203-27ENN-B-A operates at 32V DC maximum, while all CBW57 substitutes are rated for 50V DC. This increased DC rating in substitute parts does not restrict their application in circuits operating at or below 32V DC.

Regulatory compliance for substitute parts includes cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. These certifications align with the primary part's UL1077 and UL1500 approvals, establishing equivalence for safety-critical applications.

Inventory availability for substitute parts ranges from 850 to 2458 units, providing multiple sourcing options for production requirements.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series breakers directly replace the CLB-203-27ENN-B-A in existing applications?

A: Yes. All substitute parts share identical current rating (20A), AC voltage rating (250V), mounting configuration (panel mount), actuation method (push to reset), and pole count (1). The increased DC voltage rating (50V versus 32V) does not restrict operation in 32V DC circuits.

Q: What is the significance of the DC voltage rating difference?

A: The substitute parts are rated for 50V DC operation, exceeding the main part's 32V DC specification. This higher rating provides additional margin in DC applications but does not affect compatibility with systems designed for 32V DC operation.

Q: Are all substitute parts certified to the same standards?

A: Substitute parts carry UL 1077 and UL 1500 certifications, matching the main part's regulatory approvals. Additional certifications for substitutes include cURus, IP 40, and SAE J1171, providing equivalent or enhanced compliance coverage.

Q: Do the different part number suffixes indicate functional differences?

A: Part number suffixes in the CBW57 series denote packaging, connector, or terminal configuration variants. All listed substitutes maintain identical electrical specifications for current rating, voltage rating, and thermal protection characteristics.

Q: What is the Moisture Sensitivity Level (MSL) for substitute parts?

A: All CBW57 substitute parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Are substitute parts available in equivalent packaging quantities?

A: All substitute parts are supplied in bulk packaging, consistent with the main part's packaging specification.

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