Equivalent & Substitute Parts for MDQ-15 Glass Cartridge Fuse

Part Overview

The MDQ-15 is a 15 A, 32 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" x 1-1/4" (6.35mm x 31.75mm). The part is currently active in production with 991 pieces in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical form factors, and approval certifications to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	15 A
Voltage Rating (AC)	32 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
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	1 kA (Eaton); 300 A (Littelfuse)
Mounting Type	Requires Holder
Approval Agency	CSA, UL

Substitute Part Grouping Explanation

Substitution eligibility for the MDQ-15 is determined by the following criteria:

Mandatory Matching Parameters:

Current Rating: 15 A
Voltage Rating (AC): 32 V
Response Time: Slow Blow
Fuse Type: Cartridge, Glass
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

All identified substitute parts meet these mandatory parameters. Variations in breaking capacity, DC cold resistance, melting I²t, RoHS compliance status, and operating temperature ranges do not prevent substitution when the core electrical and mechanical specifications are identical.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (AC)	Response Time	Package / Case	Size (Dia x L)	Breaking Capacity @ Rated Voltage	DC Cold Resistance (Ohms)	Approval Agency	Product Status	Inventory (Pcs)
MDQ-15	Eaton - Electronics Division	MDQ	15	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	1 kA	0.0041	CSA, UL	Active	991
BK/MDL-15-R	Eaton - Electronics Division	MDL	15	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	1 kA	0.005	CE, CSA, UL	Active	1213
BK/MDQ-15	Eaton - Electronics Division	MDQ	15	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	1 kA	0.0041	CSA, UL	Active	697
MDL-15-R	Eaton - Electronics Division	MDL	15	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	1 kA	0.005	CE, CSA, UL	Active	795
0313015.HXP	Littelfuse Inc.	313	15	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	300 A	0.005	UL	Active	1639
0313015.MXP	Littelfuse Inc.	313	15	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	300 A	0.005	UL	Active	1840
0313015.VXP	Littelfuse Inc.	313	15	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	300 A	0.005	UL	Active	690

Engineering Selection Recommendations

All substitute parts listed are active products with current manufacturing status. Selection among equivalent parts should be based on the following factors:

Eaton MDQ Series (MDQ-15, BK/MDQ-15): These parts maintain identical electrical characteristics and DC cold resistance to the reference part. Both carry CSA and UL approvals. The BK/MDQ-15 variant is available with higher inventory (697 pcs).

Eaton MDL Series (MDL-15-R, BK/MDL-15-R): These parts provide CE certification in addition to CSA and UL approvals, making them suitable for applications requiring European compliance. The MDL series carries a melting I²t rating of 354. The BK/MDL-15-R variant offers the highest inventory availability (1213 pcs) among Eaton options.

Littelfuse 313 Series (0313015.HXP, 0313015.MXP, 0313015.VXP): These parts are manufactured by Littelfuse Inc. and carry UL approval. All three variants feature a lower breaking capacity of 300 A at rated voltage compared to Eaton parts (1 kA), a melting I²t rating of 1870, and an operating temperature range of -55°C to 125°C. The 0313015.MXP variant has the highest inventory (1840 pcs).

All parts are RoHS3 compliant or unaffected by RoHS regulations. Selection should prioritize availability, required certifications, and thermal operating range requirements for the specific application.

Frequently Asked Questions (FAQ)

Q: Can MDQ-15 be directly replaced with MDL-15-R?

A: Yes. Both parts share identical current rating (15 A), voltage rating (32 V AC), response time (Slow Blow), fuse type (Cartridge, Glass), and mechanical package (3AB, 3AG, 1/4" x 1-1/4"). The MDL-15-R provides additional CE certification. Breaking capacity and DC cold resistance differences do not affect direct substitution.

Q: What is the difference between Eaton and Littelfuse equivalents?

A: All parts meet the core electrical and mechanical specifications. Littelfuse 313 series parts (0313015.HXP, 0313015.MXP, 0313015.VXP) feature a lower breaking capacity (300 A versus 1 kA for Eaton), higher melting I²t (1870 versus 354 for MDL series), and a specified operating temperature range (-55°C to 125°C). Eaton parts do not specify an operating temperature range. Littelfuse parts carry UL approval only, while Eaton MDL series carries CE, CSA, and UL approvals.

Q: Are BK-prefixed variants interchangeable with non-prefixed variants?

A: Yes. BK/MDQ-15 and MDQ-15 are electrically and mechanically identical. BK/MDL-15-R and MDL-15-R are electrically and mechanically identical. The BK prefix does not indicate a functional difference in fuse performance.

Q: Which substitute part has the highest inventory availability?

A: The 0313015.MXP (Littelfuse 313 series) has the highest inventory with 1840 pieces in stock, followed by 0313015.HXP with 1639 pieces.

Q: Can these fuses be used in applications requiring -55°C to 125°C operating temperature?

A: Only Littelfuse 313 series parts (0313015.HXP, 0313015.MXP, 0313015.VXP) specify an operating temperature range of -55°C to 125°C. Eaton MDQ and MDL series parts do not specify an operating temperature range in the provided data.

Q: What is the difference between 0313015.HXP, 0313015.MXP, and 0313015.VXP?

A: All three Littelfuse parts are electrically and mechanically identical with matching current rating, voltage rating, response time, package, breaking capacity, melting I²t, and operating temperature range. The suffix designations (HXP, MXP, VXP) do not indicate functional differences in fuse performance based on the provided specifications.

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