CLB-303-12CNN-W-F Equivalent & Substitute Parts

Part Overview

The CLB-303-12CNN-W-F is a thermal circuit breaker manufactured by Carling Technologies, rated for 30A 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 constraints require component alternatives that maintain equivalent electrical and mechanical specifications.

Key Parameters

Parameter	Value
Breaker Type	Thermal
Current Rating	30A
Voltage Rating - AC	250V
Voltage Rating - DC	32V
Mounting Type	Panel Mount
Actuator Type	Push to Reset
Number of Poles	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CLB-303-12CNN-W-F are qualified based on strict electrical and mechanical parameter alignment. All identified substitutes maintain the following critical specifications: 30A current rating, 250V AC voltage rating, single-pole configuration, thermal breaker type, push-to-reset actuation, and panel-mount installation method. All substitute parts are manufactured by OptiFuse under the CBW57 series and carry ROHS3 compliance status.

The DC voltage rating for substitute parts is specified at 50V, which exceeds the 32V DC requirement of the primary part. This higher DC rating does not compromise compatibility and provides additional operational margin in DC applications. All substitutes carry equivalent regulatory approvals including cURus, UL 1077, and UL 1500 certifications, ensuring functional and safety equivalence across the product group.

Parameter Comparison

Parameter	CLB-303-12CNN-W-F (Carling)	CBW57-EJ-30A (OptiFuse)	CBW57-EL4-30A (OptiFuse)	CBW57-ES-30A (OptiFuse)	CBW57-PB-30A-WX (OptiFuse)	CBW57-PS-30A (OptiFuse)	CBW57-PS-30A-5X (OptiFuse)
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal
Current Rating (Amps)	30A	30A	30A	30A	30A	30A	30A
Voltage Rating - AC	250V	250V	250V	250V	250V	250V	250V
Voltage Rating - DC	32V	50V	50V	50V	50V	50V	50V
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount
Actuator Type	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All seven substitute parts listed maintain active product status and full regulatory compliance. The CBW57 series from OptiFuse provides direct functional equivalence to the CLB-303-12CNN-W-F across all critical electrical parameters. Selection among the substitute options may be based on inventory availability and specific connector or terminal configurations denoted by the part number suffixes (EJ, EL4, ES, PB-WX, PS, PS-5X).

The higher DC voltage rating (50V) specified for all OptiFuse substitutes does not introduce compatibility issues and represents a conservative design margin. All parts carry equivalent UL and cUL certifications, confirming suitability for the same application environments and regulatory jurisdictions as the primary Carling Technologies part.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CLB-303-12CNN-W-F in existing installations?

A: Yes. All CBW57 substitute parts maintain identical electrical ratings (30A, 250V AC), mounting configuration (panel mount), actuation method (push to reset), and pole count (single pole). The 50V DC rating of substitutes exceeds the 32V DC specification of the primary part, providing operational compatibility in all DC applications within the primary part's rating.

Q: What is the significance of the different suffixes in the CBW57 part numbers?

A: The suffixes (EJ, EL4, ES, PB-WX, PS, PS-5X) denote variations in connector type, terminal configuration, or packaging format. All variants maintain identical electrical specifications and thermal breaker characteristics. Selection should be based on mechanical interface requirements and connector compatibility with the target application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance status, matching the environmental compliance profile of the CLB-303-12CNN-W-F.

Q: Do the substitute parts carry the same regulatory certifications?

A: The substitute parts carry cURus, UL 1077, and UL 1500 certifications. The primary part carries CE, cUL, TUV, UL1077, and UL1500 certifications. Both groups meet UL 1077 and UL 1500 standards. Application-specific certification requirements should be verified against the target regulatory jurisdiction.

Q: What inventory levels are available for substitute parts?

A: Inventory availability for substitute parts ranges from 1,049 to 2,083 pieces in new original condition. CBW57-EJ-30A maintains the highest inventory level at 2,083 pieces.

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