CLB-303-11ANN-B-F Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CLB-303-11ANN-B-F is a thermal circuit breaker manufactured by Carling Technologies, rated for 30A at 250V AC and 32V DC with push-to-reset panel mount actuation. This single-pole breaker is designed for overcurrent protection in industrial and commercial applications and maintains Active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards.

Substitute parts become necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility permits selection from alternative manufacturers meeting identical electrical and mechanical specifications. The CLB-303-11ANN-B-F has five parametric equivalents available from OptiFuse within the CBW57 series, all maintaining the same current rating, voltage specifications, and mounting configuration.

Key Parameters

Parameter	CLB-303-11ANN-B-F Specification
Manufacturer	Carling Technologies
Series	CLB
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
Illumination	None
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

All five substitute parts from OptiFuse meet the critical electrical parameters that define functional equivalence to the CLB-303-11ANN-B-F:

Matching Parameters (Substitution Basis):

Current Rating: 30A
Voltage Rating - AC: 250V
Breaker Type: Thermal
Mounting Type: Panel Mount
Actuator Type: Push to Reset
Number of Poles: 1
Illumination: None
RoHS Compliance: ROHS3 Compliant

Parameter Variance: The substitute parts operate at 50V DC maximum rating compared to the 32V DC rating of the primary part. This represents an increased DC voltage capability and does not restrict substitution in applications requiring 32V DC operation or lower. All substitute parts carry equivalent regulatory approvals including UL 1077 and UL 1500 certification.

Parameter Comparison

Parameter	CLB-303-11ANN-B-F	CBW57-EJ-30A	CBW57-EL4-30A	CBW57-ES-30A	CBW57-PB-30A-WX	CBW57-PS-30A	CBW57-PS-30A-5X
Manufacturer	Carling Technologies	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	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
Illumination	None	None	None	None	None	None	None
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All five OptiFuse CBW57 series substitute parts maintain Active product status and carry regulatory certifications including UL 1077 and UL 1500, which align with the primary part's approval agencies. The CBW57 series parts hold additional certifications including cURus, IP 40, and SAE J1171, providing equivalent or enhanced compliance coverage.

Inventory Availability:

CBW57-PS-30A: 1650 Pcs
CBW57-EJ-30A: 2083 Pcs
CBW57-EL4-30A: 1437 Pcs
CBW57-ES-30A: 1369 Pcs
CBW57-PB-30A-WX: 1049 Pcs
CBW57-PS-30A-5X: 1416 Pcs

All substitute parts are suitable for direct replacement in applications operating at 32V DC or lower, as the 50V DC rating of the OptiFuse parts provides additional margin. Selection among the five equivalents should be based on availability, delivery timeline, and any specific connector or terminal configuration requirements defined by the application design.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CLB-303-11ANN-B-F in all applications?

A: Yes, for applications operating at 32V DC or lower. The CBW57 parts are rated to 50V DC, which exceeds the CLB-303-11ANN-B-F specification of 32V DC. All other electrical parameters including 30A current rating, 250V AC rating, thermal breaker type, and push-to-reset actuation are identical.

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

A: The suffixes indicate variations in connector type, terminal configuration, or internal design features. All variants maintain identical electrical ratings and functional specifications for overcurrent protection. Selection should be based on the specific connector or terminal requirements of the application circuit.

Q: Are there any compliance or certification differences between the CLB-303-11ANN-B-F and the CBW57 substitutes?

A: Both the primary part and all substitutes are ROHS3 compliant. The CBW57 series carries UL 1077 and UL 1500 certifications matching the primary part, with additional certifications including cURus, IP 40, and SAE J1171. No compliance gaps exist for standard industrial applications.

Q: What is the Moisture Sensitivity Level (MSL) of the substitute parts?

A: All CBW57 series parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can I use a CBW57 part rated for 50V DC in a 32V DC application?

A: Yes. The higher DC voltage rating of the CBW57 parts provides additional safety margin in 32V DC applications. The thermal trip characteristics and current ratings remain identical to the CLB-303-11ANN-B-F.

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