CMB-033-11C3B-R-A Equivalent & Substitute Parts

Part Overview

The CMB-033-11C3B-R-A is a thermal circuit breaker manufactured by Carling Technologies, designed for panel mount applications. This single-pole breaker operates at 3A current rating with 250 V AC and 32 V DC voltage specifications, featuring push-to-reset actuation. The product maintains active status with full compliance to CE, cUL, TUV, UL1077, and UL1500 approval agencies. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design flexibility permits equivalent component selection.

Substiute Parts

CMB-033-11C3B-R-A

Carling TechnologiesIn Stock: 928CMB-033-11C3B-R-A Datasheet

Current PartRFQ

CBW57-EJ-3A

OptiFuseIn Stock: 1310CBW57-EJ-3A Datasheet

Parametric EquivalentRFQ

CBW57-EL4-3A

OptiFuseIn Stock: 1370CBW57-EL4-3A Datasheet

Parametric EquivalentRFQ

CBW57-ES-3A

OptiFuseIn Stock: 1344CBW57-ES-3A Datasheet

Parametric EquivalentRFQ

CBW57-PF-3A-5X

OptiFuseIn Stock: 938CBW57-PF-3A-5X Datasheet

Parametric EquivalentRFQ

CBW57-PS-3A-1X

OptiFuseIn Stock: 1225CBW57-PS-3A-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CMB-033-11C3B-R-A are qualified based on the following critical parameters that determine functional equivalence:

Matching Parameters:

• Current Rating: 3A
• Voltage Rating - AC: 250 V
• Mounting Type: Panel Mount
• Breaker Type: Thermal
• Actuator Type: Push to Reset
• Number of Poles: 1
• RoHS Compliance: ROHS3 Compliant

Parameter Variance:

• Voltage Rating - DC: Substitute parts are rated at 50 V DC, exceeding the 32 V DC specification of the main part. This represents an uprated capability suitable for applications requiring the main part's specifications.
• Manufacturer: OptiFuse (substitute series CBW57) versus Carling Technologies (main series CMB)
• Approval Agencies: Substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications, with UL 1077 and UL 1500 matching the main part's approvals

All identified substitutes maintain electrical and mechanical compatibility within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and environmental regulatory adherence. The CBW57 series from OptiFuse provides functional equivalence across the critical electrical parameters: 3A current rating, 250 V AC voltage, panel mount configuration, thermal breaker type, and push-to-reset actuation.

The DC voltage rating differential (50 V for substitutes versus 32 V for the main part) represents an uprated specification. Substitutes are suitable for applications operating within the main part's 32 V DC specification, as the higher rating provides additional margin.

Approval agency certifications differ between manufacturers. The main part carries CE, cUL, TUV, UL1077, and UL1500 approvals. Substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both product lines include UL 1077 and UL 1500 compliance, which are primary standards for thermal circuit breakers.

Component selection should be based on application voltage requirements, certification requirements specific to the end application, and availability constraints.

Frequently Asked Questions (FAQ)

Q: Can CBW57 series parts directly replace the CMB-033-11C3B-R-A?

A: Yes. The CBW57 series substitutes match all critical electrical and mechanical parameters: 3A current rating, 250 V AC voltage, 32 V DC operation (substitutes rated to 50 V DC), panel mount configuration, thermal breaker type, push-to-reset actuation, and single-pole design. Both product lines are ROHS3 compliant and carry UL 1077 and UL 1500 certifications.

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

A: The substitute parts are rated for higher DC voltage operation (50 V DC) compared to the main part (32 V DC). This uprated specification does not prevent substitution for applications operating at or below 32 V DC. The higher rating provides additional design margin for the substitute components.

Q: Are there differences in approval agencies between the main part and substitutes?

A: Yes. The main part carries CE, cUL, TUV, UL1077, and UL1500 approvals. Substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both product lines include UL 1077 and UL 1500 compliance. Application-specific certification requirements should be verified before final component selection.

Q: Do all five substitute part numbers have identical electrical specifications?

A: Yes. All five CBW57 series substitutes (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X) share identical electrical and mechanical parameters. Differences exist only in part number designations and packaging configurations.

Q: What is the inventory status of substitute parts?

A: All substitute parts maintain active inventory status. CBW57-EL4-3A has the highest inventory at 1358 pieces, followed by CBW57-ES-3A at 1289 pieces, CBW57-PS-3A-1X at 1120 pieces, CBW57-EJ-3A at 1203 pieces, and CBW57-PF-3A-5X at 869 pieces. The main part CMB-033-11C3B-R-A has 827 pieces in stock.

Q: Are substitute parts suitable for all applications using the CMB-033-11C3B-R-A?

A: Substitute parts are suitable for applications within the specified electrical parameters. Verification of approval agency requirements specific to the end application is necessary, as certification profiles differ between manufacturers. Mechanical fit and panel mount compatibility should be confirmed for the specific application.