CMB-123-11C3N-B-A Equivalent & Substitute Parts

Part Overview

The CMB-123-11C3N-B-A is a thermal circuit breaker manufactured by Carling Technologies, rated for 12A at 250V AC and 32V DC. This single-pole, panel-mount breaker features push-to-reset actuation and is designed for overcurrent protection in industrial and commercial applications. The part maintains active product status with 810 units in current inventory. Equivalent substitute parts are available from Qualtek and TE Connectivity Potter & Brumfield Relays, providing alternative sourcing options for procurement flexibility and supply chain continuity.

Substiute Parts

CMB-123-11C3N-B-A

Carling TechnologiesIn Stock: 862CMB-123-11C3N-B-A Datasheet

Current PartRFQ

QMB-123-00ENN-3BA

QualtekIn Stock: 1399QMB-123-00ENN-3BA Datasheet

Parametric EquivalentRFQ

QMB-123-11C3N-3BA

QualtekIn Stock: 1448QMB-123-11C3N-3BA Datasheet

Parametric EquivalentRFQ

W28-XQ1A-12

TE Connectivity Potter & Brumfield RelaysIn Stock: 2652W28-XQ1A-12 Datasheet

Parametric EquivalentRFQ

W28-XT1A-12

TE Connectivity Potter & Brumfield RelaysIn Stock: 1290W28-XT1A-12 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMB-123-11C3N-B-A is determined by strict equivalence across the following parameters:

• Current Rating: 12A (exact match required)
• Voltage Rating - AC: 250V (exact match required)
• Voltage Rating - DC: 32V (exact match required)
• Breaker Type: Thermal (exact match required)
• Number of Poles: 1 (exact match required)
• Mounting Type: Panel Mount (exact match required)
• Actuator Type: Push to Reset (exact match required)

All four substitute parts listed below meet these criteria and are therefore parametrically equivalent to the main part number.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts are parametrically equivalent and maintain active product status. Selection should be based on the following factors:

Carling Technologies CMB-123-11C3N-B-A carries CE, cUL, TUV, UL1077, and UL1500 certifications with REACH Unaffected status. This part is suitable for applications requiring comprehensive international approvals.

Qualtek QMB-123-00ENN-3BA and QMB-123-11C3N-3BA both carry TUV certification with REACH Affected status. These parts provide higher current inventory levels (1389 and 1400 units respectively) for applications where TUV compliance is sufficient.

TE Connectivity Potter & Brumfield Relays W28-XQ1A-12 and W28-XT1A-12 offer the highest inventory availability (2608 and 1241 units respectively) with REACH Unaffected status. These parts are suitable for high-volume procurement scenarios.

Frequently Asked Questions (FAQ)

Q: Can I substitute the CMB-123-11C3N-B-A with any of the listed parts?

A: Yes. All four substitute parts are parametrically equivalent, matching the 12A current rating, 250V AC / 32V DC voltage ratings, single-pole configuration, panel-mount design, and push-to-reset actuation. Substitution is valid from an electrical and mechanical standpoint.

Q: What are the key differences between the substitute parts?

A: The primary differences are manufacturer identity, series designation, certification scope, and inventory availability. The Carling Technologies part offers the broadest certification coverage (CE, cUL, TUV, UL1077, UL1500). Qualtek parts carry TUV certification. TE Connectivity parts provide the highest inventory levels. All parts are ROHS3 compliant.

Q: Are there any compliance considerations when substituting?

A: Yes. The CMB-123-11C3N-B-A carries multiple certifications including UL1077 and UL1500. If your application requires these specific UL certifications, verify that the substitute part carries equivalent approvals. The Qualtek and TE Connectivity parts carry different certification profiles and should be evaluated against your application requirements.

Q: What is the difference between REACH Affected and REACH Unaffected status?

A: REACH Unaffected parts (CMB-123-11C3N-B-A and W28 series) are not subject to REACH substance restrictions. REACH Affected parts (QMB series) are subject to REACH regulations and require compliance documentation. Selection depends on your regulatory jurisdiction and supply chain requirements.

Q: Which substitute offers the best inventory availability?

A: The TE Connectivity W28-XQ1A-12 offers the highest inventory with 2608 units in stock, followed by the Qualtek QMB-123-11C3N-3BA with 1400 units. The original CMB-123-11C3N-B-A has 810 units available.