CLB-033-27ENN-B-A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CLB-033-27ENN-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 3A at 250V AC and 32V DC. This single-pole, panel-mount device features push-to-reset actuation and holds active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards. The device is RoHS3 compliant and REACH unaffected.

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.

Key Parameters

Parameter	Value
Breaker Type	Thermal
Current Rating	3A
Voltage Rating - AC	250V
Voltage Rating - DC	32V
Mounting Type	Panel Mount
Number of Poles	1
Actuator Type	Push to Reset
Illumination	None
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

All substitute parts listed are parametric equivalents manufactured by OptiFuse under the CBW57 series. Substitution is valid based on the following matching criteria:

Matching Parameters:

Current Rating: 3A (identical)
Voltage Rating - AC: 250V (identical)
Mounting Type: Panel Mount (identical)
Number of Poles: 1 (identical)
Actuator Type: Push to Reset (identical)
Breaker Type: Thermal (identical)
Illumination: None (identical)
RoHS Status: ROHS3 Compliant (identical)
REACH Status: REACH Unaffected (identical)

Variance Parameter:

Voltage Rating - DC: 50V (substitute) versus 32V (main part). The substitute parts operate at a higher DC voltage rating, which provides expanded operational capability within DC applications.

All substitute parts maintain active product status and hold equivalent regulatory approvals including UL 1077 and UL 1500 certifications.

Parameter Comparison

Parameter	CLB-033-27ENN-B-A (Carling)	CBW57-EJ-3A (OptiFuse)	CBW57-EL4-3A (OptiFuse)	CBW57-ES-3A (OptiFuse)	CBW57-PF-3A-5X (OptiFuse)	CBW57-PS-3A-1X (OptiFuse)
Breaker Type	Thermal	Thermal	Thermal	Thermal	Thermal	Thermal
Current Rating (Amps)	3A	3A	3A	3A	3A	3A
Voltage Rating - AC	250V	250V	250V	250V	250V	250V
Voltage Rating - DC	32V	50V	50V	50V	50V	50V
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount
Number of Poles	1	1	1	1	1	1
Actuator Type	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset	Push to Reset
Illumination	None	None	None	None	None	None
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All five OptiFuse CBW57 series substitute parts are functionally equivalent to the CLB-033-27ENN-B-A for applications operating at or below 32V DC. The substitute parts carry higher DC voltage ratings (50V), which provides additional design margin in DC applications without compromising performance in lower-voltage circuits.

All substitute parts maintain active product status and hold regulatory certifications including UL 1077 and UL 1500. The CBW57 series includes cURus and SAE J1171 approvals in addition to the UL certifications present on the main part.

Selection among the five substitute options may be based on inventory availability and specific connector or terminal configurations designated by the part number suffixes (EJ, EL4, ES, PF-5X, PS-1X). All variants share identical electrical ratings and compliance profiles.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CLB-033-27ENN-B-A?

A: Yes. All five CBW57 variants meet the electrical specifications of the CLB-033-27ENN-B-A. The 50V DC rating on substitute parts exceeds the 32V DC requirement, providing compatibility for all applications within the original specification range.

Q: What is the significance of the different CBW57 part number suffixes?

A: The suffixes (EJ, EL4, ES, PF-5X, PS-1X) designate different connector or terminal configurations within the CBW57 base series. All variants maintain identical electrical and thermal characteristics at 3A, 250V AC, and 50V DC.

Q: Are there compliance differences between the main part and substitutes?

A: Both the main part and all substitutes are RoHS3 compliant and REACH unaffected. The substitute parts include additional certifications (cURus, IP 40, SAE J1171) beyond the main part's CE, cUL, TUV, UL1077, and UL1500 approvals. Both maintain UL 1077 and UL 1500 certifications.

Q: Does the higher DC voltage rating on substitute parts affect circuit operation?

A: No. A higher voltage rating indicates the component can safely operate at higher voltages without degradation. Applications operating at 32V DC or lower experience no functional change when using the 50V-rated substitute parts.

Q: What inventory considerations apply to these substitutes?

A: Current inventory levels vary among the five substitute options, ranging from 869 to 1358 pieces. The main part CLB-033-27ENN-B-A maintains 1053 pieces in stock. Selection may consider availability requirements for procurement timelines.

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