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

Part Overview

The MDQ-1/4 is a 250 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton Electronics Division. This component requires a 3AB or 3AG fuse holder and is designed for circuit protection applications requiring slow-blow response characteristics. The part is currently active in production with 1105 units in stock. Equivalent and substitute parts are necessary to ensure supply chain continuity, accommodate design revisions, or meet specific compliance requirements across different manufacturers.

Key Parameters

Parameter	Value
Current Rating	250 mA
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	35A
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution of the MDQ-1/4 fuse is determined by strict equivalence across the following parameters:

Critical Matching Parameters:

Current Rating: 250 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Size / Dimension: 0.250" Dia x 1.250" L (exact match required)
Breaking Capacity @ Rated Voltage: 35A (exact match required)

All substitute parts listed below meet these critical parameters. Variations in secondary parameters such as DC cold resistance, melting I²t, approval agencies, and RoHS compliance status do not affect functional substitutability but may influence selection based on specific application requirements or regulatory mandates.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (Amps)	Voltage Rating (AC)	Response Time	Package / Case	Size / Dimension	Breaking Capacity @ Rated Voltage	DC Cold Resistance (Ohms)	Melting I²t	Product Status	Approval Agency	RoHS Status
MDQ-1/4	Eaton - Electronics Division	250 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	35A	5.775	Not Specified	Active	CSA, UL	Not Specified
BK/MDL-1/4-R	Eaton - Electronics Division	250 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	35A	3.208	0.447	Active	CE, CSA, UL	ROHS3 Compliant
BK/MDQ-1/4	Eaton - Electronics Division	250 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	35A	5.775	Not Specified	Active	CSA, UL	RoHS non-compliant
0034.3411	SCHURTER Inc.	250 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	35A	Not Specified	0.4	Obsolete	CE	ROHS3 Compliant
0313.250HXP	Littelfuse Inc.	250 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	35A	4.27	0.385	Active	CE, CSA, UL	ROHS3 Compliant
0313.250MXP	Littelfuse Inc.	250 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	35A	4.27	0.385	Active	CE, CSA, UL	ROHS3 Compliant
0313.250VXP	Littelfuse Inc.	250 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	35A	4.27	0.385	Active	CE, CSA, UL	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection (Active Status, Full Compliance):

The BK/MDL-1/4-R, 0313.250HXP, 0313.250MXP, and 0313.250VXP are all active production parts with full compliance certifications (CE, CSA, UL) and ROHS3 compliance. These parts are suitable for new designs and applications requiring regulatory compliance across North American and European markets.

Secondary Selection (Active Status, Limited Compliance):

The BK/MDQ-1/4 is an active production part from Eaton with CSA and UL certifications but is RoHS non-compliant. This part is suitable for applications where RoHS compliance is not required.

Restricted Selection (Obsolete Status):

The 0034.3411 from SCHURTER Inc. is obsolete and should be used only when existing inventory must be maintained or when legacy system compatibility is required. This part carries CE certification and ROHS3 compliance but is no longer in active production.

Frequently Asked Questions (FAQ)

Q: Can I substitute MDQ-1/4 with any of the listed parts?

A: Yes. All listed parts meet the critical electrical and mechanical parameters: 250 mA current rating, 250 V AC voltage rating, slow-blow response, 3AB/3AG package, and 0.250" Dia x 1.250" L dimensions. Physical and electrical compatibility is assured.

Q: What is the difference between the Eaton MDQ-1/4 and BK/MDL-1/4-R?

A: Both are manufactured by Eaton and are functionally equivalent. The BK/MDL-1/4-R has lower DC cold resistance (3.208 Ohms vs. 5.775 Ohms), includes CE certification in addition to CSA and UL, and is ROHS3 compliant. The MDQ-1/4 does not specify RoHS compliance status.

Q: Are the Littelfuse 0313 series parts (0313.250HXP, 0313.250MXP, 0313.250VXP) interchangeable?

A: Yes. All three Littelfuse parts share identical electrical specifications: 250 mA, 250 V, slow-blow response, 0.250" Dia x 1.250" L dimensions, 4.27 Ohms DC cold resistance, and 0.385 melting I²t. They are functionally interchangeable.

Q: Should I use the obsolete 0034.3411 from SCHURTER?

A: The 0034.3411 is obsolete and should not be selected for new designs. Use this part only if maintaining existing inventory or supporting legacy systems where this specific part number is required.

Q: What compliance certifications should I verify for my application?

A: Verify that the selected substitute part carries the required certifications for your market. CSA and UL certifications are required for North American applications. CE certification is required for European markets. ROHS3 compliance is mandatory for many consumer and industrial applications in regulated markets.

Q: Does the fuse holder type affect substitution?

A: No. All substitute parts require the same 3AB or 3AG fuse holder. The holder type does not change across any of the listed equivalents.

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