CLB-303-27ENN-B-A/30 Equivalent & Substitute Parts

Part Overview

The CLB-303-27ENN-B-A/30 is a thermal circuit breaker manufactured by Carling Technologies, rated for 30A at 250V AC and 32V DC with push-to-reset actuation and panel mount configuration. This component is classified as Active product status and carries multiple international approvals including CE, cUL, TUV, UL1077, and UL1500. The device is ROHS3 compliant and REACH unaffected.

Substitute parts become necessary when the primary component experiences extended lead times, inventory constraints, or when design flexibility permits selection from alternative manufacturers while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

CLB-303-27ENN-B-A/30

Carling TechnologiesIn Stock: 718CLB-303-27ENN-B-A/30 Datasheet

Current PartRFQ

CBW57-EJ-30A

OptiFuseIn Stock: 2118CBW57-EJ-30A Datasheet

Parametric EquivalentRFQ

CBW57-EL4-30A

OptiFuseIn Stock: 1508CBW57-EL4-30A Datasheet

Parametric EquivalentRFQ

CBW57-ES-30A

OptiFuseIn Stock: 1381CBW57-ES-30A Datasheet

Parametric EquivalentRFQ

CBW57-PB-30A-WX

OptiFuseIn Stock: 1062CBW57-PB-30A-WX Datasheet

Parametric EquivalentRFQ

CBW57-PS-30A

OptiFuseIn Stock: 1721CBW57-PS-30A Datasheet

Parametric EquivalentRFQ

CBW57-PS-30A-5X

OptiFuseIn Stock: 1507CBW57-PS-30A-5X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CLB-303-27ENN-B-A/30 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

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

Acceptable Variance:

• Voltage Rating - DC: The main part specifies 32V DC. Substitute parts rated at 50V DC exceed the minimum requirement and remain functionally compatible in applications operating at or below 32V DC.

All identified substitute parts are manufactured by OptiFuse and belong to the CBW57 series. Each substitute maintains identical AC voltage rating, current rating, breaker type, actuation method, mounting configuration, and pole count. The DC voltage rating variance represents an upward specification, providing enhanced capability without compromising compatibility.

Parameter Comparison

Engineering Selection Recommendations

All seven OptiFuse CBW57 series substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the original CLB-303-27ENN-B-A/30 component.

Compliance Considerations:

The CLB-303-27ENN-B-A/30 carries approvals from CE, cUL, TUV, UL1077, and UL1500. The OptiFuse CBW57 series components carry approvals from cURus, IP 40, SAE J1171, UL 1077, and UL 1500. Both product families demonstrate compliance with UL 1077 and UL 1500 standards, establishing a foundation for functional equivalence in regulated applications.

Inventory Availability:

The main part CLB-303-27ENN-B-A/30 maintains 691 pieces in stock. The substitute parts demonstrate higher inventory levels: CBW57-PS-30A (1650 pcs), CBW57-EJ-30A (2083 pcs), CBW57-EL4-30A (1437 pcs), CBW57-ES-30A (1369 pcs), CBW57-PS-30A-5X (1416 pcs), and CBW57-PB-30A-WX (1049 pcs). Enhanced availability supports supply chain continuity.

DC Voltage Rating Variance:

The substitute parts are rated for 50V DC compared to the main part's 32V DC specification. This represents an upward specification variance that does not restrict application in circuits operating at 32V DC or lower. The higher DC rating provides additional operational margin without introducing incompatibility.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CLB-303-27ENN-B-A/30 in existing designs?

A: Yes. All substitute parts match the critical electrical parameters: 30A current rating, 250V AC voltage rating, thermal breaker type, push-to-reset actuation, single-pole configuration, and panel mount form factor. The 50V DC rating of substitute parts exceeds the 32V DC requirement, maintaining compatibility in applications operating at or below 32V DC.

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 denote internal design variations within the CBW57 series. All variants listed maintain identical electrical specifications for current rating, AC voltage, DC voltage, and actuation type. The suffix differences reflect manufacturing or packaging distinctions that do not affect electrical or mechanical compatibility for the specified application parameters.

Q: Are there any compliance differences between the Carling CLB-303-27ENN-B-A/30 and OptiFuse CBW57 substitutes?

A: Both product families carry UL 1077 and UL 1500 certifications. The CLB-303-27ENN-B-A/30 includes CE and TUV approvals, while the CBW57 series includes cURus and SAE J1171 approvals. Both are ROHS3 compliant. Application requirements determine whether specific certifications are mandatory for your design.

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

A: The OptiFuse CBW57 series components are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can I use these substitute parts in applications requiring CE or TUV certification?

A: The substitute parts do not carry CE or TUV certifications. If your application mandates these specific certifications, the CLB-303-27ENN-B-A/30 remains the required choice. If your application requires only UL 1077 and UL 1500 compliance, the CBW57 substitutes are suitable.

Q: How do the REACH compliance statuses compare?

A: The CLB-303-27ENN-B-A/30 is REACH Unaffected. CBW57-PS-30A and CBW57-PS-30A-5X are REACH Unaffected. CBW57-EJ-30A, CBW57-ES-30A, and CBW57-PB-30A-WX do not specify REACH status in the provided data. CBW57-EL4-30A is REACH Unaffected. Verify REACH compliance requirements for your specific application before selection.

Q: Are there inventory advantages to selecting substitute parts?

A: Yes. The CBW57-PS-30A variant maintains the highest inventory level at 1650 pieces, followed by CBW57-EJ-30A at 2083 pieces. These levels exceed the main part's 691-piece inventory, supporting faster procurement and reduced lead times when supply constraints occur.