Equivalent & Substitute Parts for Eaton BK/MDQ-3/10 Glass Cartridge Fuse

Part Overview

The Eaton BK/MDQ-3/10 is a 300 mA, 250 V AC/DC slow-blow glass cartridge fuse designed for 3AB and 3AG holder applications. This fuse is classified as Active product status with 745 units currently in stock. Substitute parts are necessary to address inventory availability, compliance requirements, or specific application performance characteristics while maintaining electrical and mechanical compatibility within the 3AB/3AG form factor.

Key Parameters

Parameter	Value
Current Rating	300 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDQ-3/10 is determined by strict equivalence across the following parameters:

Critical Parameters (Must Match Exactly):

Current Rating: 300 mA
Voltage Rating (AC): 250 V
Response Time: Slow Blow
Fuse Type: Cartridge, Glass
Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage: 35A

All substitute parts listed meet these requirements. Secondary parameters such as DC cold resistance, melting I²t, RoHS compliance, and approval agencies vary among substitutes but do not affect mechanical or primary electrical compatibility within the specified holder system.

Parameter Comparison

Parameter	BK/MDQ-3/10 (Eaton)	BK/MDL-3/10-R (Eaton)	0034.5215 (SCHURTER)	0313.300HXP (Littelfuse)
Manufacturer	Eaton - Electronics Division	Eaton - Electronics Division	SCHURTER Inc.	Littelfuse Inc.
Current Rating (Amps)	300 mA	300 mA	300 mA	300 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	35A	35A	35A	35A
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Active	Active	Obsolete	Active
DC Cold Resistance (Ohms)	4.2	2.046	Not Specified	3.135
Melting I²t	Not Specified	0.412	1.27	0.73
Approval Agency	CSA, UL	CE, CSA, UL	CSA, UL	CE, CSA, UL
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature Range	Not Specified	Not Specified	-55°C ~ 125°C	-55°C ~ 125°C
Inventory (Pcs)	745	1334	1283	957

Engineering Selection Recommendations

BK/MDL-3/10-R (Eaton - Electronics Division): This substitute maintains Eaton manufacturer continuity while offering improved compliance status (ROHS3 Compliant vs. RoHS non-compliant). It carries CE, CSA, and UL approvals and has the highest inventory availability at 1334 units. DC cold resistance is lower at 2.046 Ohms compared to the main part's 4.2 Ohms.

0313.300HXP (Littelfuse Inc.): This substitute is Active status with CE, CSA, and UL approvals and ROHS3 compliance. It provides specified operating temperature range (-55°C ~ 125°C) and melting I²t of 0.73. DC cold resistance is 3.135 Ohms, positioned between the main part and the Eaton MDL variant.

0034.5215 (SCHURTER Inc.): This substitute carries Obsolete product status and should be selected only when inventory of Active alternatives is unavailable. It maintains CSA and UL approvals with ROHS3 compliance and provides the highest melting I²t value at 1.27. Operating temperature range is specified at -55°C ~ 125°C.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-3/10-R be used as a direct replacement for BK/MDQ-3/10?

A: Yes. Both parts share identical electrical ratings (300 mA, 250 V AC), response time (Slow Blow), fuse type (Cartridge, Glass), and mechanical package (3AB, 3AG, 1/4" x 1-1/4"). Both are designed for the same holder system and have equivalent breaking capacity of 35A.

Q: What is the difference between the Eaton MDQ and MDL series?

A: The MDQ and MDL series are both Eaton slow-blow glass cartridge fuses with identical electrical and mechanical specifications for this 300 mA, 250 V rating. The primary differences are DC cold resistance (MDQ: 4.2 Ohms vs. MDL: 2.046 Ohms) and compliance status (MDQ: RoHS non-compliant vs. MDL: ROHS3 Compliant).

Q: Why is the SCHURTER 0034.5215 marked as Obsolete?

A: Product status reflects manufacturer classification. Obsolete designation indicates the part is no longer in active production. However, 1283 units remain in inventory. Selection should prioritize Active status alternatives (BK/MDL-3/10-R or 0313.300HXP) when available.

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

A: Yes. All substitute parts maintain the identical 1/4" x 1-1/4" (6.35mm x 31.75mm) physical dimensions and are specified for 3AB and 3AG holder compatibility.

Q: What is the significance of melting I²t values in the parameter comparison?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Variations among substitutes (BK/MDL-3/10-R: 0.412, 0313.300HXP: 0.73, 0034.5215: 1.27) reflect different internal element designs while maintaining the same 300 mA current rating and slow-blow response characteristic.

Q: Which substitute offers the best compliance profile?

A: BK/MDL-3/10-R and 0313.300HXP both offer ROHS3 compliance and CE certification in addition to CSA and UL approvals. The main part BK/MDQ-3/10 is RoHS non-compliant, making these substitutes preferable for applications with regulatory compliance requirements.

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