QMB-122-00ENN-3BA Equivalent & Substitute Parts

Part Overview

The QMB-122-00ENN-3BA is a thermal circuit breaker manufactured by Qualtek, rated for 12A at 250V AC / 32V DC with push-to-reset panel mount actuation. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing system maintenance and new designs. Substitute parts must maintain identical electrical ratings, mechanical mounting compatibility, and functional characteristics to ensure direct interchangeability without circuit redesign.

Key Parameters

Parameter	Value
Current Rating	12A
Voltage Rating - AC	250V
Voltage Rating - DC	32V
Breaker Type	Thermal
Mounting Type	Panel Mount
Actuator Type	Push to Reset
Number of Poles	1
Approval Agency	TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across all electrical and mechanical parameters. All substitute parts listed maintain the following critical specifications:

Current Rating: 12A (exact match required)
Voltage Rating: 250V AC / 32V DC (exact match required)
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)
RoHS Status: ROHS3 Compliant (exact match required)

Substitute parts are grouped into two categories: direct manufacturer equivalents from Qualtek and parametric equivalents from alternative manufacturers (Carling Technologies and TE Connectivity Potter & Brumfield Relays). All parts in both categories satisfy the electrical and mechanical requirements for direct substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (Amps)	Voltage Rating - AC	Voltage Rating - DC	Breaker Type	Mounting Type	Actuator Type	Poles	Product Status	Approval Agency	RoHS Status	Inventory (Pcs)
QMB-122-00ENN-3BA	Qualtek	QMB	12A	250V	32V	Thermal	Panel Mount	Push to Reset	1	Discontinued	TUV	ROHS3 Compliant	1042
QMB-123-00ENN-3BA	Qualtek	QMB	12A	250V	32V	Thermal	Panel Mount	Push to Reset	1	Active	TUV	ROHS3 Compliant	1389
QMB-123-11C3N-3BA	Qualtek	QMB	12A	250V	32V	Thermal	Panel Mount	Push to Reset	1	Active	TUV	ROHS3 Compliant	1400
CLB-123-11B3A-B-A	Carling Technologies	CLB	12A	250V	32V	Thermal	Panel Mount	Push to Reset	1	Active	CE, cUL, TUV, UL1077, UL1500	ROHS3 Compliant	749
CMB-123-11C3N-B-A	Carling Technologies	CMB	12A	250V	32V	Thermal	Panel Mount	Push to Reset	1	Active	CE, cUL, TUV, UL1077, UL1500	ROHS3 Compliant	810
W28-XQ1A-12	TE Connectivity Potter & Brumfield Relays	W28	12A	250V	32V	Thermal	Panel Mount	Push to Reset	1	Active	Not specified	ROHS3 Compliant	2608
W28-XT1A-12	TE Connectivity Potter & Brumfield Relays	W28	12A	250V	32V	Thermal	Panel Mount	Push to Reset	1	Active	Not specified	ROHS3 Compliant	1241

Engineering Selection Recommendations

Qualtek Direct Equivalents (QMB-123-00ENN-3BA, QMB-123-11C3N-3BA): These parts are the primary substitutes for the discontinued QMB-122-00ENN-3BA. Both maintain Qualtek manufacturer continuity, TUV approval, and active product status. QMB-123-00ENN-3BA offers the highest inventory availability (1389 pcs) and is the recommended first choice for direct replacement.

Carling Technologies Equivalents (CLB-123-11B3A-B-A, CMB-123-11C3N-B-A): These parts provide parametric equivalence with expanded approval certifications (CE, cUL, UL1077, UL1500 in addition to TUV). Both are active products with adequate inventory. Selection of Carling parts is appropriate when multi-standard compliance is required or when Qualtek parts are unavailable.

TE Connectivity Potter & Brumfield Relays Equivalents (W28-XQ1A-12, W28-XT1A-12): These parts satisfy all electrical and mechanical parameters. W28-XQ1A-12 offers the highest inventory level (2608 pcs) among all substitutes. These parts are suitable for applications where TE Connectivity supply chain integration is preferred.

Frequently Asked Questions (FAQ)

Q: Can QMB-122-00ENN-3BA be directly replaced with QMB-123-00ENN-3BA?

A: Yes. Both parts share identical electrical ratings (12A, 250V AC, 32V DC), thermal breaker type, panel mount configuration, push-to-reset actuation, and single-pole design. QMB-123-00ENN-3BA is the direct successor with active product status.

Q: Are Carling Technologies and TE Connectivity parts truly interchangeable with Qualtek?

A: Yes, within the scope of the specified parameters. All substitute parts maintain 12A current rating, 250V AC / 32V DC voltage ratings, thermal breaker type, panel mount configuration, push-to-reset actuation, and single-pole design. Carling parts provide additional certifications (CE, cUL, UL1077, UL1500). Physical form factor compatibility must be verified for panel cutout dimensions, though all parts are panel mount type.

Q: What is the difference between QMB-123-00ENN-3BA and QMB-123-11C3N-3BA?

A: Both parts are Qualtek QMB series thermal circuit breakers with identical electrical specifications (12A, 250V AC, 32V DC). The difference lies in internal design or configuration codes represented by the part number suffix. Both are active products suitable for substitution.

Q: Which substitute part has the best availability?

A: W28-XQ1A-12 (TE Connectivity) has the highest inventory at 2608 pcs. QMB-123-00ENN-3BA (Qualtek) has 1389 pcs available. Both provide immediate supply options.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 Compliant, matching the original QMB-122-00ENN-3BA specification.

Q: Are there packaging differences between substitutes?

A: All substitute parts are supplied in Bulk packaging. The original QMB-122-00ENN-3BA packaging type is not specified in the provided data.

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