CMB-033-12H3N-B-A Equivalent & Substitute Parts

Part Overview

The CMB-033-12H3N-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 part is ROHS3 compliant and REACH unaffected. Substitute parts are identified when equivalent electrical and mechanical parameters are required for component selection, inventory management, or design flexibility across manufacturing sources.

Substiute Parts

CMB-033-12H3N-B-A

Carling TechnologiesIn Stock: 1111CMB-033-12H3N-B-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-033-12H3N-B-A are qualified based on the following critical parameters that must align with the main part:

Mandatory Matching Parameters:

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

Allowable Variation:

• Voltage Rating (DC): The main part specifies 32V DC. Substitute parts rated at 50V DC are acceptable as this represents a higher voltage capability and maintains backward compatibility in applications requiring 32V DC operation.

All identified substitute parts are manufactured by OptiFuse under the CBW57 series and meet these substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

All five OptiFuse CBW57 series substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the CMB-033-12H3N-B-A. The substitute parts carry approval certifications including cURus, IP 40, SAE J1171, UL 1077, and UL 1500, which provide equivalent or complementary regulatory coverage to the original part's CE, cUL, TUV, UL1077, and UL1500 approvals.

The primary electrical distinction is the DC voltage rating: the original part is rated 32V DC, while all substitutes are rated 50V DC. This higher DC rating in substitute parts does not restrict their use in 32V DC applications and provides additional design margin. Both the original and substitute parts share identical AC voltage ratings (250V), current ratings (3A), mounting configuration (panel mount), and actuation mechanism (push to reset).

All substitute parts are available in bulk packaging with inventory levels ranging from 869 to 1358 pieces. The original CMB-033-12H3N-B-A maintains 1087 pieces in stock. Selection among substitute parts should be based on specific application requirements, lead time considerations, and supply chain preferences.

Frequently Asked Questions (FAQ)

Q: Can OptiFuse CBW57 series parts directly replace the Carling CMB-033-12H3N-B-A?

A: Yes. All five OptiFuse CBW57 variants (CBW57-EJ-3A, CBW57-EL4-3A, CBW57-ES-3A, CBW57-PF-3A-5X, and CBW57-PS-3A-1X) are parametric equivalents. They share identical current ratings (3A), AC voltage ratings (250V), mounting type (panel mount), actuator type (push to reset), pole configuration (1 pole), and RoHS compliance status. The 50V DC rating on substitute parts exceeds the 32V DC requirement of the original part.

Q: What is the significance of the DC voltage rating difference?

A: The original CMB-033-12H3N-B-A is rated 32V DC. The substitute parts are rated 50V DC. A higher DC voltage rating indicates the component can safely operate at higher DC voltages without degradation. In applications using 32V DC, the 50V DC-rated substitutes operate within their design envelope with additional safety margin.

Q: Are there differences in approval certifications between the original and substitute parts?

A: The original part carries CE, cUL, TUV, UL1077, and UL1500 certifications. The substitute parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both sets include UL 1077 and UL 1500 approvals. The substitute parts include SAE J1171 certification, which is relevant for automotive and similar applications. Specific application requirements should determine if certification differences impact suitability.

Q: Do all substitute parts have the same inventory availability?

A: No. Inventory levels vary: CBW57-EJ-3A (1203 pcs), CBW57-EL4-3A (1358 pcs), CBW57-ES-3A (1289 pcs), CBW57-PF-3A-5X (869 pcs), and CBW57-PS-3A-1X (1120 pcs). The original CMB-033-12H3N-B-A has 1087 pieces in stock. All parts are listed as Active with new original stock status.

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

A: All OptiFuse CBW57 substitute parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Are substitute parts available in different packaging formats?

A: All substitute parts are supplied in bulk packaging. The original CMB-033-12H3N-B-A packaging format is not specified in the provided data.

Q: Can I use these parts interchangeably in existing designs?

A: Yes, for applications designed for the CMB-033-12H3N-B-A. The substitute parts maintain identical electrical performance at the specified operating parameters (3A, 250V AC, 32V DC operation). Physical panel-mount compatibility should be verified against specific mounting hole patterns and dimensions in your application design.