CLB-303-12CNN-R-A Equivalent & Substitute Parts

Part Overview

The CLB-303-12CNN-R-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 30A 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 component is ROHS3 compliant and classified as REACH unaffected. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate component alternatives with equivalent electrical and mechanical specifications.

Substiute Parts

CLB-303-12CNN-R-A

Carling TechnologiesIn Stock: 1171CLB-303-12CNN-R-A 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

Substitute parts for the CLB-303-12CNN-R-A are qualified based on the following critical parameters that determine functional equivalence:

Electrical Equivalence Criteria:

• Current Rating: 30A (exact match required)
• Voltage Rating - AC: 250V (exact match required)
• Voltage Rating - DC: 50V (substitute parts rated at 50V DC exceed the 32V DC requirement and remain compatible)

Mechanical Equivalence Criteria:

• Breaker Type: Thermal (exact match required)
• Mounting Type: Panel Mount (exact match required)
• Actuator Type: Push to Reset (exact match required)
• Number of Poles: 1 (exact match required)

Compliance Criteria:

• RoHS3 Compliant (all substitute parts meet this requirement)
• Product Status: Active (all substitute parts maintain active status)

All identified substitute parts are manufactured by OptiFuse under the CBW57 series and satisfy these equivalence parameters. The higher DC voltage rating (50V versus 32V) on substitute parts provides enhanced capability without compromising compatibility in applications designed for the original 32V DC specification.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance, ensuring continued availability and regulatory conformance. The OptiFuse CBW57 series components carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, providing equivalent or enhanced approval coverage compared to the original CLB-303-12CNN-R-A.

The substitute parts are functionally equivalent across all critical electrical and mechanical parameters. The elevated DC voltage rating (50V versus 32V) on OptiFuse components represents a design enhancement that maintains backward compatibility with applications specified for 32V DC operation.

Inventory availability across the substitute parts ranges from 1,049 to 2,083 units, providing reliable sourcing alternatives. Selection among the six substitute options should be based on specific application requirements, lead time considerations, and internal procurement preferences, as all parts satisfy the established equivalence criteria.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CLB-303-12CNN-R-A in existing applications?

A: Yes. All six identified OptiFuse CBW57 series parts are parametric equivalents. They match the critical specifications: 30A current rating, 250V AC voltage rating, panel-mount configuration, push-to-reset actuation, and single-pole design. The higher 50V DC rating on substitute parts does not prevent their use in 32V DC applications.

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

A: The CBW57 series components are rated for 50V DC compared to the original 32V DC specification. This represents enhanced capability and ensures the substitute parts operate safely across a broader voltage range. Applications designed for 32V DC operation remain fully compatible.

Q: Are all six substitute parts interchangeable with each other?

A: Yes. All six OptiFuse CBW57 variants (CBW57-EJ-30A, CBW57-EL4-30A, CBW57-ES-30A, CBW57-PB-30A-WX, CBW57-PS-30A, and CBW57-PS-30A-5X) share identical electrical and mechanical specifications. Differences in part number suffixes reflect manufacturing or packaging variations that do not affect functional equivalence.

Q: What compliance standards apply to the substitute parts?

A: OptiFuse CBW57 series components carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. These certifications provide equivalent or enhanced regulatory coverage compared to the original part's CE, cUL, TUV, UL1077, and UL1500 approvals.

Q: Are the substitute parts ROHS3 compliant?

A: Yes. All six OptiFuse CBW57 series substitute parts are ROHS3 compliant, matching the environmental compliance status of the original CLB-303-12CNN-R-A.

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

A: OptiFuse CBW57 series components carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity constraints for storage or handling.

Q: How do I select among the six available substitute options?

A: All six parts are functionally equivalent. Selection should be based on inventory availability, lead time requirements, internal procurement specifications, or application-specific packaging preferences. Current inventory levels range from 1,049 to 2,083 units across the variants.