CLB-203-11ANN-W-F Equivalent & Substitute Parts

Part Overview

The CLB-203-11ANN-W-F is a thermal circuit breaker manufactured by Carling Technologies, designed for panel mount applications. This single-pole breaker operates at 20A with 250V AC and 32V DC ratings, featuring a push-to-reset actuator mechanism. The product maintains active 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 qualified alternatives that meet identical electrical and mechanical specifications.

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

Substitution eligibility for thermal circuit breakers is determined by strict equivalence across electrical and mechanical parameters. The CLB-203-11ANN-W-F establishes the baseline specification set: 20A current rating, 250V AC voltage rating, 32V DC voltage rating, single-pole configuration, push-to-reset actuation, and panel mount form factor.

All substitute parts listed maintain these core parameters. OptiFuse CBW57 series alternatives satisfy substitution criteria through identical current ratings, AC voltage ratings, actuator types, pole counts, and mounting configurations. The DC voltage rating differential (50V DC on substitutes versus 32V DC on the primary part) represents an uprated specification that does not restrict substitution, as higher voltage ratings provide equivalent or superior performance in lower-voltage applications.

Substitution logic is based exclusively on:

Current Rating (Amps): 20A
Voltage Rating - AC: 250V
Mounting Type: Panel Mount
Actuator Type: Push to Reset
Number of Poles: 1
Breaker Type: Thermal

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (Amps)	Voltage Rating - AC	Voltage Rating - DC	Mounting Type	Actuator Type	Poles	RoHS Status	Product Status
CLB-203-11ANN-W-F	Carling Technologies	20A	250V	32V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-EJ-20A	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-EL4-20A	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-ES-20A	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-ES-20A-5H	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-ES-20A-5X	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-HS-20A-5X	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-HS-20A-C	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-PB-20A-WX	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-PF-20A-5X	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active
CBW57-PL-20A-5X	OptiFuse	20A	250V	50V	Panel Mount	Push to Reset	1	ROHS3 Compliant	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, establishing functional equivalence with the CLB-203-11ANN-W-F. The OptiFuse CBW57 series alternatives carry regulatory approvals including cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, providing cross-certification coverage with the primary part's CE, cUL, TUV, UL1077, and UL1500 approvals.

The DC voltage rating differential (50V DC on substitutes versus 32V DC on the primary part) does not restrict substitution. Higher voltage ratings accommodate the same operating conditions and represent an uprated specification. All alternatives are manufactured to ROHS3 standards with REACH unaffected status where specified.

Selection among substitute parts should be based on inventory availability, delivery lead times, and specific connector or terminal configurations required by the application. The CBW57-ES-20A-5H variant offers the highest current inventory level at 2,458 units. All alternatives are electrically and mechanically interchangeable within the specified parameter set.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series breakers replace the Carling Technologies CLB-203-11ANN-W-F?

A: Yes. All listed OptiFuse CBW57 variants meet the electrical and mechanical substitution criteria: 20A current rating, 250V AC voltage rating, single-pole configuration, push-to-reset actuation, and panel mount form factor. The 50V DC rating on OptiFuse parts represents an uprated specification suitable for 32V DC applications.

Q: What is the significance of the higher DC voltage rating on substitute parts?

A: The CBW57 series carries a 50V DC rating compared to the CLB-203-11ANN-W-F's 32V DC rating. Higher voltage ratings do not restrict substitution in lower-voltage applications. The substitute parts operate safely and effectively at or below the primary part's voltage specifications.

Q: Are all CBW57 variants electrically identical?

A: All listed CBW57 variants share identical electrical specifications: 20A current rating, 250V AC, 50V DC, single-pole thermal operation, and push-to-reset actuation. Differences in part number suffixes (such as -EJ, -ES, -HS, -PB, -PF, -PL) indicate variations in connector types, terminal configurations, or packaging options rather than electrical performance.

Q: What regulatory certifications apply to substitute parts?

A: OptiFuse CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. These certifications provide regulatory coverage equivalent to the primary part's CE, cUL, TUV, UL1077, and UL1500 approvals for thermal circuit breaker applications.

Q: Which substitute part has the best availability?

A: CBW57-ES-20A-5H maintains the highest inventory level at 2,458 units in stock. CBW57-ES-20A-5X and CBW57-HS-20A-5X also offer strong availability at 1,097 and 1,804 units respectively.

Q: Are substitute parts RoHS compliant?

A: Yes. All listed OptiFuse CBW57 variants are ROHS3 compliant, matching the primary part's environmental compliance status. REACH unaffected status is confirmed for most variants where specified in product documentation.

Q: Can I use these substitutes in existing panel designs without modification?

A: Panel mount compatibility is confirmed across all alternatives. However, connector and terminal configurations may differ between specific CBW57 variants. Verify that the selected substitute part's terminal type matches the application's wiring requirements before installation.

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