CLBA-303-NNFNN-B-A Circuit Breaker Thermal 30A 250V AC 32V DC

Part Overview

The CLBA-303-NNFNN-B-A is an active thermal circuit breaker manufactured by Carling Technologies, rated for 30 amperes at 250 volts AC and 32 volts DC. This single-pole, panel-mount device features push-to-reset actuation and is designed for overcurrent protection in electrical systems. The part is ROHS3 compliant and holds multiple regulatory approvals including CE, cUL, TUV, UL1077, and UL1500. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across alternative manufacturers, ensuring functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Manufacturer	Carling Technologies
Series	CLB
Breaker Type	Thermal
Current Rating	30A
Voltage Rating - AC	250 V
Voltage Rating - DC	32 V
Mounting Type	Panel Mount
Actuator Type	Push to Reset
Number of Poles	1
Illumination	None
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CLBA-303-NNFNN-B-A are identified based on strict electrical and mechanical parameter equivalence. The critical parameters determining substitution eligibility are:

Current Rating: 30A (exact match required)
Voltage Rating - AC: 250V (exact match required)
Mounting Type: Panel Mount (exact match required)
Breaker Type: Thermal (exact match required)
Actuator Type: Push to Reset (exact match required)
Number of Poles: 1 (exact match required)

All identified substitute parts are manufactured by OptiFuse under the CBW57 series. These parts maintain identical current ratings, AC voltage ratings, mounting configurations, and actuation mechanisms. The DC voltage rating for substitute parts is 50V, which exceeds the 32V DC specification of the main part, providing enhanced capability in DC applications. All substitute parts maintain active product status and ROHS3 compliance.

Parameter Comparison

Parameter	CLBA-303-NNFNN-B-A (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	250 V	250 V	250 V	250 V	250 V	250 V	250 V
Voltage Rating - DC	32 V	50 V	50 V	50 V	50 V	50 V	50 V
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
Illumination	None	None	None	None	None	None	None
Product Status	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance, ensuring regulatory alignment with the original CLBA-303-NNFNN-B-A specification. The OptiFuse CBW57 series parts hold regulatory approvals including cURus, UL 1077, and UL 1500, which overlap with the original part's certification portfolio.

The substitute parts are functionally equivalent across all critical electrical parameters: 30-ampere current rating, 250-volt AC rating, single-pole configuration, thermal operation, and push-to-reset actuation. The enhanced DC voltage rating of 50V in substitute parts provides additional operational margin in DC applications compared to the original 32V specification.

All substitute parts are available in bulk packaging with active inventory status. Selection among the seven identified substitute part numbers should be based on specific application requirements, connector interface specifications, and internal design variations denoted by the part number suffixes (EJ, EL4, ES, PB-WX, PS, PS-5X).

Frequently Asked Questions (FAQ)

Q: What makes these OptiFuse CBW57 parts equivalent to the Carling CLBA-303-NNFNN-B-A?

A: Equivalence is established through matching of critical electrical and mechanical parameters: 30-ampere current rating, 250-volt AC rating, 32-volt DC minimum rating, single-pole thermal operation, push-to-reset actuation, and panel-mount configuration. All parts maintain identical functional characteristics for overcurrent protection applications.

Q: Why do the substitute parts have a higher DC voltage rating (50V vs. 32V)?

A: The 50-volt DC rating of OptiFuse CBW57 parts exceeds the original specification, providing enhanced capability in DC circuit applications. This higher rating does not affect compatibility in circuits designed for 32-volt DC operation.

Q: Are all seven OptiFuse part numbers interchangeable?

A: All seven OptiFuse CBW57 series parts meet the electrical and mechanical substitution criteria. Differences in part number suffixes (EJ, EL4, ES, PB-WX, PS, PS-5X) indicate variations in internal design or connector interface specifications. Selection should be based on specific application interface requirements.

Q: What regulatory approvals apply to the substitute parts?

A: OptiFuse CBW57 series parts hold approvals including cURus, IP 40, SAE J1171, UL 1077, and UL 1500. These certifications provide regulatory coverage for industrial and automotive circuit protection applications.

Q: Is inventory availability a factor in part selection?

A: Inventory levels vary across the substitute part numbers, ranging from 1,049 to 2,083 pieces in stock. Availability should be considered in procurement planning alongside application-specific requirements.

Q: Can these parts be used in both AC and DC circuits?

A: Yes. All parts are rated for both 250-volt AC and DC operation (32V for the original part, 50V for substitutes), enabling use in mixed-voltage system designs.

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