CLB-303-00DNN-B-A Equivalent & Substitute Parts

Part Overview

The CLB-303-00DNN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 30A at 250V AC and 32V DC. This single-pole, panel-mount breaker features push-to-reset actuation and is designed for overcurrent protection in industrial and commercial applications. The part maintains Active product status with 950 units in current inventory stock.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, enabling direct replacement in applications where the original part becomes unavailable or when alternative sourcing is required.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts are classified as parametric equivalents based on the following criteria:

Critical Matching Parameters:

Current Rating: 30A (exact match required)
Voltage Rating - AC: 250V (exact match required)
Breaker Type: Thermal (exact match required)
Mounting Type: Panel Mount (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, maintaining backward compatibility in DC applications.

All identified substitute parts are manufactured by OptiFuse and belong to the CBW57 series. Each substitute maintains identical AC voltage, current rating, breaker type, mounting configuration, and actuation method as the CLB-303-00DNN-B-A.

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	Product Status
CLB-303-00DNN-B-A	Carling Technologies	30A	250V	32V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-EJ-30A	OptiFuse	30A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-EL4-30A	OptiFuse	30A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-ES-30A	OptiFuse	30A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-PB-30A-WX	OptiFuse	30A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-PS-30A	OptiFuse	30A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-PS-30A-5X	OptiFuse	30A	250V	50V	Thermal	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original CLB-303-00DNN-B-A. The substitute parts carry regulatory approvals including cURus, UL 1077, and UL 1500 certifications, which overlap with the main part's approval agencies (CE, cUL, TUV, UL1077, UL1500).

The DC voltage rating increase from 32V to 50V in OptiFuse CBW57 series parts represents enhanced capability without reducing performance in the original 32V DC application space. All substitute parts are available in bulk packaging with inventory levels ranging from 1,049 to 2,083 units.

Selection among the five OptiFuse substitute models should be based on specific application requirements and internal part numbering conventions, as all five variants meet the electrical and mechanical equivalency criteria established for the CLB-303-00DNN-B-A.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CLB-303-00DNN-B-A in existing installations?

A: Yes. All identified CBW57 substitute parts match the critical electrical parameters (30A, 250V AC) and mechanical specifications (panel mount, push-to-reset, single-pole thermal breaker) of the CLB-303-00DNN-B-A. The higher DC voltage rating (50V versus 32V) does not prevent substitution in applications originally designed for 32V DC operation.

Q: What is the significance of the different CBW57 part number suffixes (EJ, EL4, ES, PB-WX, PS, PS-5X)?

A: The suffixes indicate internal design variations within the CBW57 series. All variants listed maintain identical electrical ratings and mechanical mounting characteristics. Suffix differences reflect manufacturing or packaging distinctions that do not affect electrical equivalency for substitution purposes.

Q: Are there compliance or certification differences between the main part and substitute parts?

A: Both the CLB-303-00DNN-B-A and all CBW57 substitutes are ROHS3 compliant. The main part carries CE, cUL, TUV, UL1077, and UL1500 approvals. The CBW57 substitutes carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 approvals. UL 1077 and UL 1500 certifications are common to both product lines.

Q: What inventory levels are available for substitute parts?

A: CBW57-EJ-30A: 2,083 units; CBW57-EL4-30A: 1,437 units; CBW57-ES-30A: 1,369 units; CBW57-PB-30A-WX: 1,049 units; CBW57-PS-30A: 1,650 units; CBW57-PS-30A-5X: 1,416 units. All substitute parts are available in bulk packaging.

Q: Is the CLB-303-00DNN-B-A still in active production?

A: Yes. The CLB-303-00DNN-B-A maintains Active product status with 950 units currently in stock inventory.

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