MDQ-2-1/4 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The MDQ-2-1/4 is a 2.25 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as Active product status and requires a holder for installation (3AB, 3AG format). The fuse is designed for circuit protection applications requiring slow-blow response characteristics and is approved by CSA and UL agencies. Substitute parts are necessary when the primary MDQ-2-1/4 is unavailable due to inventory constraints, supply chain disruptions, or when alternative manufacturers' components meet identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	2.25 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)
Breaking Capacity @ Rated Voltage	100 A
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the MDQ-2-1/4 is determined by strict equivalence across the following parameters:

Current Rating: Must be 2.25 A
Voltage Rating (AC): Must be 250 V
Fuse Type: Must be Cartridge, Glass
Response Time: Must be Slow Blow
Package / Case: Must be 3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension: Must be 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Breaking Capacity @ Rated Voltage: Must be 100 A

All substitute parts listed below meet these criteria. Variations in secondary parameters such as DC Cold Resistance, Melting I²t, and approval agencies do not disqualify substitution when primary electrical and mechanical parameters are identical.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Fuse Type	Response Time	Package / Case	Size (Dia x L)	Breaking Capacity (A)	Product Status
MDQ-2-1/4	Eaton - Electronics Division	2.25	250	Cartridge, Glass	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	100	Active
BK/MDL-2-1/4-R	Eaton - Electronics Division	2.25	250	Cartridge, Glass	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	100	Active
0034.5232	SCHURTER Inc.	2.25	250	Cartridge, Glass	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	100	Obsolete
03132.25HXP	Littelfuse Inc.	2.25	250	Cartridge, Glass	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	100	Active
03132.25MXP	Littelfuse Inc.	2.25	250	Cartridge, Glass	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	100	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status)

BK/MDL-2-1/4-R, 03132.25HXP, and 03132.25MXP are recommended as primary substitutes. All three maintain Active product status and are manufactured by established component suppliers (Eaton and Littelfuse). BK/MDL-2-1/4-R is manufactured by the same supplier as the original MDQ-2-1/4 (Eaton - Electronics Division) and carries identical approval agencies (CSA, UL). The Littelfuse parts (03132.25HXP and 03132.25MXP) carry expanded approval certifications including CE, K-MARK, and PSE in addition to CSA and UL.

Secondary Substitute (Obsolete Status)

0034.5232 manufactured by SCHURTER Inc. meets all electrical and mechanical parameters but carries Obsolete product status. This part is suitable for substitution only when Active alternatives are unavailable. It maintains CSA and UL approvals and operates across the temperature range -55°C to 125°C.

All substitute parts are RoHS3 compliant and REACH unaffected where specified.

Frequently Asked Questions (FAQ)

Q: Can I use 03132.25HXP or 03132.25MXP interchangeably with MDQ-2-1/4?

A: Yes. Both Littelfuse parts are parametric equivalents meeting all critical specifications: 2.25 A current rating, 250 V AC voltage rating, slow-blow response, 3AB/3AG package format, and 0.250" x 1.250" dimensions. Both are Active status products with comprehensive approval certifications.

Q: What is the difference between 03132.25HXP and 03132.25MXP?

A: Both parts are manufactured by Littelfuse in the 313 series with identical electrical ratings, voltage, current, response time, and package specifications. The designations HXP and MXP indicate different internal construction or performance characteristics not specified in the provided parameters. Both are functionally equivalent for the MDQ-2-1/4 substitution.

Q: Why is 0034.5232 marked as Obsolete?

A: Product status reflects manufacturer availability and production status. The 0034.5232 (SCHURTER FST 6.3x32 series) is no longer in active production. However, it remains electrically and mechanically equivalent to MDQ-2-1/4 and may be available through inventory channels.

Q: Are there any differences in DC Cold Resistance between these parts?

A: Yes. DC Cold Resistance values vary slightly: MDQ-2-1/4 (0.1145 Ohms), BK/MDL-2-1/4-R (0.096 Ohms), and Littelfuse parts 03132.25HXP and 03132.25MXP (0.0968 Ohms). These variations do not affect substitution eligibility as they fall within acceptable tolerance ranges for slow-blow cartridge fuses and do not impact circuit protection performance at the specified 2.25 A rating.

Q: Do all substitute parts require the same holder?

A: Yes. All substitute parts use the 3AB, 3AG package format with 1/4" x 1-1/4" dimensions. They are directly compatible with any holder designed for the MDQ-2-1/4 cartridge fuse.

Q: Which substitute has the best availability?

A: According to inventory data, 03132.25HXP (Littelfuse) has the highest stock level at 7,649 pieces, followed by 0034.5232 (SCHURTER) at 1,087 pieces, MDQ-2-1/4 (Eaton) at 1,044 pieces, 03132.25MXP (Littelfuse) at 2,581 pieces, and BK/MDL-2-1/4-R (Eaton) at 906 pieces.

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