CLB-203-11ANN-B-A/20 Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CLB-203-11ANN-B-A/20 is a thermal circuit breaker manufactured by Carling Technologies, rated for 20A 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 design flexibility is required within equivalent electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer	Carling Technologies
Part Number	CLB-203-11ANN-B-A/20
Series	CLB
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
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the CLB-203-11ANN-B-A/20 are qualified based on the following critical parameters that must align with the main part specification:

Mandatory Matching Parameters:

Current Rating: 20A
Voltage Rating (AC): 250V
Mounting Type: Panel Mount
Breaker Type: Thermal
Actuator Type: Push to Reset
Number of Poles: 1
Illumination: None

Allowable Variation:

Voltage Rating (DC): The main part specifies 32V DC. Substitute parts rated at 50V DC are acceptable as this represents a higher voltage capability and maintains backward compatibility in applications requiring 32V DC operation.

All identified substitute parts are manufactured by OptiFuse and belong to the CBW57 series. Each substitute maintains identical electrical performance characteristics for the specified 20A, 250V AC application while offering alternative connector or terminal configurations denoted by the suffix designations (EJ, EL4, ES, HS, PB, PF, PL).

Parameter Comparison

Parameter	CLB-203-11ANN-B-A/20	CBW57-EJ-20A	CBW57-EL4-20A	CBW57-ES-20A	CBW57-ES-20A-5H	CBW57-ES-20A-5X	CBW57-HS-20A-5X	CBW57-HS-20A-C	CBW57-PB-20A-WX	CBW57-PF-20A-5X	CBW57-PL-20A-5X
Manufacturer	Carling Technologies	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse	OptiFuse
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal
Current Rating (Amps)	20A	20A	20A	20A	20A	20A	20A	20A	20A	20A	20A
Voltage Rating (AC)	250V	250V	250V	250V	250V	250V	250V	250V	250V	250V	250V
Voltage Rating (DC)	32V	50V	50V	50V	50V	50V	50V	50V	50V	50V	50V
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	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	Push to Reset	Push to Reset	Push to Reset	Push to Reset
Number of Poles	1	1	1	1	1	1	1	1	1	1	1
Illumination	None	None	None	None	None	None	None	None	None	None	None
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	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 comply with ROHS3 environmental standards. The OptiFuse CBW57 series alternatives carry regulatory approvals including cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, which align with the primary part's compliance framework.

The primary distinction among substitute options relates to terminal and connector configurations, indicated by the suffix designations. Selection between CBW57-EJ-20A, CBW57-EL4-20A, CBW57-ES-20A variants, CBW57-HS-20A options, CBW57-PB-20A-WX, CBW57-PF-20A-5X, and CBW57-PL-20A-5X should be determined by the specific panel mounting interface and terminal connection requirements of the application.

All substitute parts are rated at 50V DC, which exceeds the 32V DC specification of the main part. This higher DC voltage rating does not restrict application in circuits operating at or below 32V DC and provides additional design margin for DC applications.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series circuit breakers directly replace the CLB-203-11ANN-B-A/20 in existing installations?

A: Direct mechanical and electrical replacement is possible when the terminal configuration of the selected CBW57 variant matches the panel mounting interface. The identical 20A, 250V AC rating and push-to-reset actuation ensure functional equivalence. Physical mounting dimensions and connector type must be verified against the specific application requirements.

Q: What is the significance of the 50V DC rating on substitute parts compared to the 32V DC rating of the main part?

A: The 50V DC rating on OptiFuse CBW57 substitutes represents a higher voltage capability. These parts are fully compatible with applications requiring 32V DC operation, as the higher rating provides additional voltage margin without affecting performance at lower voltages.

Q: Are all CBW57 variants listed suitable for the same applications?

A: All listed CBW57 variants share identical electrical specifications (20A, 250V AC, 50V DC, thermal operation, push-to-reset). Differences exist only in terminal and connector configurations, denoted by suffix designations. Selection depends on the specific panel mounting interface and terminal connection type required by the application.

Q: What regulatory certifications apply to the substitute parts?

A: OptiFuse CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 approvals. These certifications align with the primary part's compliance profile and support use in regulated industrial and commercial applications.

Q: Is inventory availability a factor in selecting between substitute parts?

A: Inventory levels vary among the CBW57 variants, ranging from 862 to 2458 pieces in stock. Availability should be considered as a practical factor when selecting among electrically equivalent options, particularly for time-sensitive procurement requirements.

Q: Do all substitute parts maintain ROHS3 compliance?

A: Yes, all identified OptiFuse CBW57 circuit breaker variants are ROHS3 compliant, matching the environmental compliance status of the primary CLB-203-11ANN-B-A/20 part.

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