CLB-203-12CNN-R-A Equivalent & Substitute Parts

Part Overview

The CLB-203-12CNN-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 is designed for overcurrent protection in industrial and commercial applications. 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 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-R-A are qualified based on matching the following critical parameters: 20A current rating, 250V AC voltage rating, push-to-reset actuation, single-pole configuration, panel-mount installation, and thermal breaker type. All substitute parts are manufactured by OptiFuse under the CBW57 series designation.

The substitute parts listed maintain electrical compatibility through identical current and AC voltage ratings. The DC voltage rating for substitute parts is specified at 50V, which exceeds the 32V DC specification of the main part, providing enhanced capability in DC applications. All substitute parts retain the same mounting configuration, actuator mechanism, and pole count as the primary part.

Substitution is determined by the following key parameters:

Current Rating (Amps): 20A
Voltage Rating - AC: 250V
Voltage Rating - DC: 50V (exceeds primary specification)
Breaker Type: Thermal
Mounting Type: Panel Mount
Actuator Type: Push to Reset
Number of Poles: 1
RoHS Status: ROHS3 Compliant

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (Amps)	Voltage Rating - AC	Voltage Rating - DC	Breaker Type	Mounting Type	Actuator Type	Number of Poles	RoHS Status	Inventory (Pcs)
CLB-203-12CNN-R-A	Carling Technologies	20A	250V	32V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	621
CBW57-EJ-20A	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	1978
CBW57-EL4-20A	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	850
CBW57-ES-20A	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	1833
CBW57-ES-20A-5H	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	2458
CBW57-ES-20A-5X	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	1097
CBW57-HS-20A-5X	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	1804
CBW57-HS-20A-C	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	1724
CBW57-PB-20A-WX	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	1176
CBW57-PF-20A-5X	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	994
CBW57-PL-20A-5X	OptiFuse	20A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	862

Engineering Selection Recommendations

All listed substitute parts maintain active product status and comply with ROHS3 requirements. The OptiFuse CBW57 series parts carry regulatory approvals including cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, which align with the primary part's compliance framework.

The substitute parts are electrically compatible with the CLB-203-12CNN-R-A for applications requiring 20A thermal protection at 250V AC. The elevated DC voltage rating of 50V in substitute parts provides operational margin beyond the primary part's 32V DC specification, making these parts suitable for direct substitution in existing circuit designs.

Selection among substitute parts should be based on availability, inventory levels, and specific connector or terminal configurations required by the application. All substitute parts share identical electrical performance characteristics and mounting requirements with the primary part.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series parts directly replace the Carling Technologies CLB-203-12CNN-R-A?

A: Yes. All listed OptiFuse CBW57 series parts are parametric equivalents with matching 20A current rating, 250V AC voltage rating, push-to-reset actuation, single-pole configuration, and panel-mount installation. The 50V DC rating of substitute parts exceeds the primary part's 32V DC specification.

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) indicate variations in connector type, terminal configuration, or housing material. These designations do not affect the core electrical parameters of current rating, voltage rating, or breaker type. Selection should be based on the specific connector or terminal requirements of the application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the environmental compliance status of the primary part.

Q: What regulatory approvals do the substitute parts carry?

A: OptiFuse CBW57 series parts are certified to cURus, IP 40, SAE J1171, UL 1077, and UL 1500 standards. These certifications provide equivalent regulatory coverage for industrial and commercial circuit protection applications.

Q: Is the higher DC voltage rating of substitute parts a concern for applications designed for 32V DC?

A: No. A higher DC voltage rating indicates enhanced capability and does not create compatibility issues in applications specified for lower voltages. The 50V DC rating of substitute parts provides operational margin and is suitable for direct substitution.

Q: What inventory levels are available for substitute parts?

A: Inventory availability varies across the CBW57 series. CBW57-ES-20A-5H offers the highest inventory at 2458 units, while CBW57-PL-20A-5X offers 862 units. Specific availability should be confirmed based on current sourcing requirements.

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