BK/MDQ-2/10 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The BK/MDQ-2/10 is a 200 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is designed for use in 3AB and 3AG fuse holders with 1/4" x 1-1/4" dimensions. The part maintains active product status with 788 units currently in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	200 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
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the BK/MDQ-2/10 are qualified based on strict electrical and mechanical parameter matching. All substitute components must satisfy the following criteria:

Mandatory Matching Parameters:

Current Rating: 200 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

All identified substitute parts meet these mandatory parameters. Variations in secondary parameters such as DC Cold Resistance, Melting I²t, and RoHS compliance status do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Parameter	BK/MDQ-2/10	BK/MDL-2/10-R	0313.200MXP	0313.200VXP
Manufacturer	Eaton - Electronics Division	Eaton - Electronics Division	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	200 mA	200 mA	200 mA	200 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
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"
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)
Breaking Capacity @ Rated Voltage	35A	35A	35A	35A
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
DC Cold Resistance	8.65 Ohms	5.234 Ohms	6.59 Ohms	6.59 Ohms
Approval Agency	CSA, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts listed—BK/MDQ-2/10, BK/MDL-2/10-R, 0313.200MXP, and 0313.200VXP—maintain active product status and are electrically and mechanically interchangeable for applications requiring a 200 mA, 250 V AC/DC slow-blow glass cartridge fuse in 3AB/3AG holders.

Compliance Considerations:

The BK/MDQ-2/10 carries CSA and UL approvals but is RoHS non-compliant. Applications subject to RoHS3 regulatory requirements should specify BK/MDL-2/10-R, 0313.200MXP, or 0313.200VXP, all of which are ROHS3 compliant and carry CE, CSA, and UL certifications.

The Littelfuse parts (0313.200MXP and 0313.200VXP) provide expanded operating temperature range (-55°C ~ 125°C) compared to the Eaton parts, which do not specify operating temperature limits. This parameter is relevant for applications operating outside standard environmental conditions.

Inventory Availability:

Current stock levels are: BK/MDQ-2/10 (788 units), BK/MDL-2/10-R (980 units), 0313.200MXP (1396 units), and 0313.200VXP (771 units).

Frequently Asked Questions (FAQ)

Q: Are all listed parts electrically interchangeable with the BK/MDQ-2/10?

A: Yes. All substitute parts match the mandatory electrical parameters: 200 mA current rating, 250 V AC voltage rating, slow-blow response time, and 35A breaking capacity at rated voltage. They are electrically interchangeable.

Q: Can these parts be used in the same 3AB/3AG fuse holder?

A: Yes. All parts share identical package specifications (3AB, 3AG, 1/4" x 1-1/4") and physical dimensions (0.250" Dia x 1.250" L). They are mechanically interchangeable in any holder designed for these specifications.

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

A: The primary differences are manufacturer, DC Cold Resistance values, and operating temperature range. Littelfuse parts specify -55°C ~ 125°C operating temperature, while Eaton parts do not specify this parameter. All parts meet identical electrical and mechanical requirements.

Q: Should I use BK/MDL-2/10-R instead of BK/MDQ-2/10?

A: If your application requires RoHS3 compliance, BK/MDL-2/10-R is required. Both are Eaton products with identical electrical and mechanical specifications. BK/MDL-2/10-R also carries CE certification in addition to CSA and UL.

Q: Are the Littelfuse parts (0313.200MXP and 0313.200VXP) equivalent to the Eaton parts?

A: Yes. Both 0313.200MXP and 0313.200VXP meet all mandatory electrical and mechanical parameters. They are parametric equivalents suitable for direct substitution. Both are ROHS3 compliant and carry CE, CSA, and UL approvals.

Q: What does "Requires Holder" mean?

A: These are cartridge fuses that must be installed in a compatible fuse holder. They are not standalone components and cannot function without a proper 3AB or 3AG fuse holder assembly.

Q: Can I use these parts in applications rated for higher voltages?

A: No. These fuses are rated for 250 V AC maximum. Use only in applications rated at or below 250 V AC.

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