CLB-303-11ANN-W-F Circuit Breaker Equivalent & Substitute Parts

Part Overview

The CLB-303-11ANN-W-F is a thermal circuit breaker manufactured by Carling Technologies, rated for 30A at 250V AC and 32V DC. This single-pole, panel-mount breaker 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 classified as EAR99 for export control purposes.

Substitute parts become necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility permits selection from alternative manufacturers while maintaining electrical and mechanical compatibility. The substitute parts listed below satisfy the core electrical parameters and mechanical mounting requirements of the CLB-303-11ANN-W-F.

Substiute Parts

CLB-303-11ANN-W-F

Carling TechnologiesIn Stock: 1045CLB-303-11ANN-W-F 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

All substitute parts listed are classified as parametric equivalents to the CLB-303-11ANN-W-F. Substitution eligibility is determined by the following criteria:

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
• RoHS Status: ROHS3 Compliant

Allowable Variance:

• Voltage Rating - DC: The CLB-303-11ANN-W-F operates at 32V DC. All substitute parts operate at 50V DC, which represents a higher voltage capability and does not restrict operation within the original 32V DC specification.

All substitute parts are manufactured by OptiFuse under the CBW57 series and maintain Active product status with established inventory availability.

Parameter Comparison

Engineering Selection Recommendations

All seven substitute parts satisfy the electrical and mechanical requirements of the CLB-303-11ANN-W-F. Selection among the OptiFuse CBW57 series alternatives is based on the following factors:

Compliance and Certification: The CLB-303-11ANN-W-F carries approvals from CE, cUL, TUV, UL1077, and UL1500. The OptiFuse CBW57 series parts carry approvals from cURus, IP 40, SAE J1171, UL 1077, and UL 1500. Both product lines maintain UL 1077 and UL 1500 certification, establishing compatibility within regulated applications.

Product Status and Availability: All substitute parts maintain Active product status with established inventory levels ranging from 1,049 to 2,083 units. The CLB-303-11ANN-W-F has 1,026 units in stock.

Voltage Capability: The substitute parts operate at 50V DC, which exceeds the 32V DC specification of the original part. This higher voltage rating does not restrict operation in circuits designed for 32V DC and provides additional margin for voltage transients.

Moisture Sensitivity: All OptiFuse CBW57 parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage or handling.

REACH Compliance: The CLB-303-11ANN-W-F is REACH Unaffected. Among the substitute parts, CBW57-PS-30A, CBW57-PS-30A-5X, and CBW57-EL4-30A are explicitly marked as REACH Unaffected. The remaining parts do not specify REACH status in the provided data.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series breakers directly replace the Carling CLB-303-11ANN-W-F?

A: Yes. All listed OptiFuse CBW57 parts match the CLB-303-11ANN-W-F in current rating (30A), AC voltage (250V), actuator type (push to reset), mounting configuration (panel mount), pole count (1), and RoHS compliance. The 50V DC rating of the OptiFuse parts exceeds the 32V DC specification and does not restrict operation in 32V DC circuits.

Q: What is the significance of the higher 50V DC rating on the substitute parts?

A: The 50V DC rating on OptiFuse CBW57 parts represents a higher voltage capability than the 32V DC specification of the CLB-303-11ANN-W-F. This does not create incompatibility; rather, it indicates the substitute parts can operate safely at voltages up to 50V DC. Operation at 32V DC remains within the rated specification of the substitute parts.

Q: Are there differences among the five OptiFuse CBW57 substitute part numbers?

A: The five OptiFuse CBW57 part numbers (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 numbers reflect internal OptiFuse design variations, connector configurations, or manufacturing designations. All are electrically and mechanically equivalent for the specified application.

Q: Do all substitute parts carry the same regulatory approvals as the original CLB-303-11ANN-W-F?

A: Both the CLB-303-11ANN-W-F and all OptiFuse CBW57 substitutes carry UL 1077 and UL 1500 certification. The original part includes CE, cUL, and TUV approvals. The OptiFuse parts carry cURus, IP 40, and SAE J1171 approvals. The overlap in UL certifications establishes compatibility in applications requiring these standards.

Q: What is the inventory status of the substitute parts?

A: All substitute parts maintain Active product status with current inventory availability: CBW57-EJ-30A (2,083 units), CBW57-EL4-30A (1,437 units), CBW57-ES-30A (1,369 units), CBW57-PB-30A-WX (1,049 units), CBW57-PS-30A (1,650 units), and CBW57-PS-30A-5X (1,416 units).

Q: Are the substitute parts RoHS3 compliant?

A: Yes. All OptiFuse CBW57 substitute parts are ROHS3 compliant, matching the environmental compliance status of the CLB-303-11ANN-W-F.

Q: What is the REACH status of the substitute parts?

A: Three substitute parts explicitly carry REACH Unaffected status: CBW57-PS-30A, CBW57-PS-30A-5X, and CBW57-EL4-30A. The remaining parts do not specify REACH status in the provided technical data.

Q: Can these breakers be used interchangeably in existing panel designs?

A: Yes. All substitute parts share identical panel-mount configurations, push-to-reset actuation, and single-pole design. Physical and electrical interchangeability is established by matching mounting type, actuator mechanism, and pole count.