CLB-203-12CNN-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CLB-203-12CNN-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 product maintains active 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 suppliers.

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-203-12CNN-B-A are qualified based on the following critical parameters that determine functional equivalence:

Mandatory 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

Allowable Variation:

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 identified substitute parts are manufactured by OptiFuse under the CBW57 series and meet these equivalence criteria. Each substitute maintains ROHS3 compliance and active product status.

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-203-12CNN-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 ROHS3 compliance equivalent to the CLB-203-12CNN-B-A. The OptiFuse CBW57 series alternatives carry regulatory approvals including cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, which align with the approval framework of the primary part.

The primary distinction among substitute options relates to connector and terminal configurations, indicated by the suffix designations (EJ, EL4, ES, HS, PB, PF, PL). These designations define mechanical interface characteristics and packaging configurations. Selection among the CBW57 variants should be based on specific panel mounting requirements and connector compatibility within the target application.

All substitute parts are rated at 50V DC, which exceeds the 32V DC specification of the main part. This higher DC voltage rating provides enhanced capability for applications operating at or below 32V DC without functional compromise.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series breakers directly replace the CLB-203-12CNN-B-A?

A: Yes. All CBW57 variants listed maintain identical current rating (20A), AC voltage rating (250V), mounting configuration (panel mount), breaker type (thermal), actuation method (push to reset), and pole count (1). The 50V DC rating of CBW57 parts exceeds the 32V DC requirement of the CLB-203-12CNN-B-A, ensuring compatibility in applications operating at or below 32V DC.

Q: What do the suffix designations in CBW57 part numbers indicate?

A: Suffix designations (EJ, EL4, ES, HS, PB, PF, PL) and additional modifiers (5H, 5X, C, WX) specify connector type, terminal configuration, and packaging format. These designations do not affect the electrical performance parameters but determine physical interface compatibility with panel mounting hardware and wiring connections.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All CBW57 series substitute parts carry ROHS3 compliance certification, matching the environmental compliance status of the CLB-203-12CNN-B-A.

Q: What regulatory certifications apply to the substitute parts?

A: CBW57 series breakers carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. These certifications address thermal circuit breaker performance and safety requirements consistent with the approval framework of the primary part.

Q: How does the 50V DC rating of CBW57 parts relate to the 32V DC specification of the main part?

A: The higher DC voltage rating of substitute parts represents increased voltage capability. In applications requiring 32V DC operation, a component rated for 50V DC operates within its specified limits and maintains full performance characteristics. No derating or functional limitation occurs.

Q: Are inventory levels a consideration in part selection?

A: Inventory availability is provided for reference. CBW57-ES-20A-5H maintains the highest inventory level at 2,458 pieces, while CBW57-PL-20A-5X maintains 862 pieces. Selection should prioritize connector compatibility and mounting requirements as primary criteria.

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