Equivalent & Substitute Parts for MDQ-1-1/2 Glass Cartridge Fuse

Part Overview

The MDQ-1-1/2 is a 1.5 A, 250 V AC/DC slow blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 3AB and 3AG holders with dimensions of 1/4" diameter by 1-1/4" length (6.35mm x 31.75mm). The part is currently active in production with 1146 pieces in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative compliance certifications are required, or when design specifications allow for functionally compatible alternatives from different manufacturers. The substitute parts listed maintain identical electrical ratings and mechanical compatibility while offering variations in breaking capacity, resistance characteristics, and regulatory compliance.

Substiute Parts

MDQ-1-1/2

Eaton - Electronics DivisionIn Stock: 1243MDQ-1-1/2 Datasheet

Current PartRFQ

BK/MDL-1-1/2-R

Eaton - Electronics DivisionIn Stock: 1927BK/MDL-1-1/2-R Datasheet

Parametric EquivalentRFQ

BK/MDQ-1-1/2

Eaton - Electronics DivisionIn Stock: 762BK/MDQ-1-1/2 Datasheet

Parametric EquivalentRFQ

0034.5228

SCHURTER Inc.In Stock: 9500034.5228 Datasheet

Parametric EquivalentRFQ

031301.5HXP

Littelfuse Inc.In Stock: 1038031301.5HXP Datasheet

Parametric EquivalentRFQ

031301.5VXP

Littelfuse Inc.In Stock: 1150031301.5VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDQ-1-1/2 is determined by strict adherence to the following parameters:

Critical Parameters (Must Match Exactly):

• Current Rating: 1.5 A
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Slow Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Mounting Type: Requires Holder

Variable Parameters (May Differ Between Substitutes):

• Breaking Capacity @ Rated Voltage
• DC Cold Resistance
• Melting I²t
• Approval Agency certifications
• RoHS compliance status
• Operating Temperature range
• Manufacturer identity

All five substitute parts meet the critical parameter requirements and are therefore electrically and mechanically compatible with the MDQ-1-1/2 in applications where the holder accepts 3AB/3AG cartridge fuses.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status, Eaton Manufacturer):

BK/MDL-1-1/2-R and BK/MDQ-1-1/2 are both active Eaton products with identical electrical and mechanical specifications to the MDQ-1-1/2. BK/MDL-1-1/2-R offers enhanced breaking capacity (100 A versus 35 A) and includes CE certification in addition to CSA and UL approvals. BK/MDQ-1-1/2 maintains the same series designation as the primary part with identical resistance characteristics.

Secondary Substitutes (Active Status, Multi-Manufacturer Compliance):

031301.5HXP and 031301.5VXP are Littelfuse 313 series fuses with active product status and the broadest approval agency coverage (CE, CSA, PSE, UL). Both parts feature identical electrical ratings and melting I²t values (38). These parts are ROHS3 compliant and suitable for applications requiring international regulatory certifications.

Obsolete Alternative:

0034.5228 (SCHURTER Inc., FST 6.3x32 series) is marked as obsolete. While it meets all critical electrical and mechanical parameters, its obsolete status indicates limited future availability. This part should be selected only when inventory constraints prevent use of active alternatives.

Compliance Considerations:

Applications requiring CE certification should specify 031301.5HXP, 031301.5VXP, or BK/MDL-1-1/2-R. Applications requiring RoHS3 compliance should specify 031301.5HXP or 031301.5VXP. Applications with no specific international certification requirements may use any listed substitute.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-1-1/2-R be used as a direct replacement for MDQ-1-1/2?

A: Yes. BK/MDL-1-1/2-R meets all critical electrical parameters (1.5 A, 250 V AC, slow blow response) and mechanical specifications (3AB/3AG holder compatibility, 1/4" x 1-1/4" dimensions). The higher breaking capacity (100 A versus 35 A) provides enhanced protection capability without affecting circuit operation.

Q: What is the difference between 031301.5HXP and 031301.5VXP?

A: Both parts are Littelfuse 313 series fuses with identical electrical ratings, resistance values (0.191 Ohms), melting I²t (38), and approval certifications. The parts are functionally equivalent for all applications.

Q: Why is 0034.5228 marked as obsolete?

A: The SCHURTER 0034.5228 is listed as obsolete by the manufacturer. While it remains electrically and mechanically compatible with the MDQ-1-1/2, its obsolete status indicates that future availability cannot be guaranteed. Active alternatives should be prioritized for new designs and restocking.

Q: Are all substitute parts compatible with 3AB and 3AG holders?

A: Yes. All listed substitute parts are specified for 3AB and 3AG holder compatibility with identical 1/4" x 1-1/4" (6.35mm x 31.75mm) dimensions. Physical installation in existing holders is interchangeable.

Q: Which substitute offers the best compliance coverage?

A: 031301.5HXP and 031301.5VXP offer the broadest approval agency coverage (CE, CSA, PSE, UL) and are ROHS3 compliant. These parts are suitable for applications requiring international market certifications.

Q: Does DC cold resistance variation affect circuit performance?

A: DC cold resistance values range from 0.156 Ohms (BK/MDL-1-1/2-R) to 0.27 Ohms (MDQ-1-1/2 and BK/MDQ-1-1/2). These variations are within normal manufacturing tolerances for glass cartridge fuses and do not affect circuit protection characteristics or device operation in standard applications.

Q: Can I use a substitute with higher breaking capacity in a circuit designed for the MDQ-1-1/2?

A: Yes. Higher breaking capacity (100 A versus 35 A) indicates enhanced ability to safely interrupt fault currents. This does not affect normal circuit operation and provides equivalent or improved protection.