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

Part Overview

The MDQ-2/10 is a 200 mA, 250 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 product maintains active status and is suitable for circuit protection applications requiring slow-blow response characteristics. Equivalent substitute parts are identified based on matching electrical ratings, mechanical compatibility, and functional performance parameters.

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"
Breaking Capacity @ Rated Voltage	35 A
Mounting Type	Requires Holder
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)

Substitute Part Grouping Explanation

Substitute parts for the MDQ-2/10 are qualified based on the following criteria:

Electrical Parameters: Current rating of 200 mA, voltage rating of 250 V AC, and slow-blow response time must be identical across all substitutes.

Mechanical Parameters: All substitute parts must accommodate 3AB and 3AG holder types with identical physical dimensions of 0.250" diameter by 1.250" length.

Functional Parameters: Breaking capacity at rated voltage of 35 A must be maintained.

Holder Compatibility: All parts require external holder mounting with no variation in holder type or installation method.

The following parts meet these substitution criteria: BK/MDL-2/10-R (Eaton - Electronics Division), 0313.200MXP (Littelfuse Inc.), and 0313.200VXP (Littelfuse Inc.).

Parameter Comparison

Parameter	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	35 A	35 A	35 A	35 A
DC Cold Resistance (Ohms)	8.65	5.234	6.59	6.59
Product Status	Active	Active	Active	Active
Approval Agency	CSA, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL

Engineering Selection Recommendations

All three substitute parts—BK/MDL-2/10-R, 0313.200MXP, and 0313.200VXP—are functionally equivalent to the MDQ-2/10 based on matching electrical and mechanical parameters. Selection among these alternatives may be based on the following factors:

Approval Certifications: The MDQ-2/10 carries CSA and UL approvals. The substitute parts BK/MDL-2/10-R, 0313.200MXP, and 0313.200VXP all carry CE, CSA, and UL approvals, providing expanded regulatory compliance coverage.

Product Status: All parts maintain active product status, ensuring continued availability and support.

Inventory Availability: BK/MDL-2/10-R (980 pcs), 0313.200MXP (1396 pcs), and 0313.200VXP (771 pcs) are available in stock quantities suitable for production and replacement applications.

Resistance Characteristics: DC cold resistance values vary among the parts (MDQ-2/10: 8.65 Ohms; BK/MDL-2/10-R: 5.234 Ohms; 0313.200MXP and 0313.200VXP: 6.59 Ohms each). These variations remain within acceptable ranges for slow-blow cartridge fuse applications.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-2/10-R be used as a direct replacement for MDQ-2/10?

A: Yes. Both parts share identical current rating (200 mA), voltage rating (250 V AC), response time (slow-blow), and mechanical dimensions (0.250" Dia x 1.250" L). Both are compatible with 3AB and 3AG holders and maintain 35 A breaking capacity at rated voltage.

Q: What is the difference between the Littelfuse 0313.200MXP and 0313.200VXP?

A: Both Littelfuse parts are electrically and mechanically identical. They share the same current rating, voltage rating, response time, dimensions, and breaking capacity. Both are compatible with 3AB and 3AG holders. Selection between these two models may be based on inventory availability or specific supply chain requirements.

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

A: Yes. All substitute parts maintain the identical physical dimensions of 0.250" diameter by 1.250" length and are designed for use in 3AB and 3AG holder types. No holder modifications or replacements are required.

Q: Does DC cold resistance variation affect substitution compatibility?

A: DC cold resistance values differ among the parts but remain within acceptable operating ranges for slow-blow glass cartridge fuses. All parts maintain identical electrical performance characteristics for circuit protection applications.

Q: What regulatory approvals do the substitute parts carry?

A: BK/MDL-2/10-R carries CE, CSA, and UL approvals. Both 0313.200MXP and 0313.200VXP carry CE, CSA, and UL approvals. The original MDQ-2/10 carries CSA and UL approvals. All parts meet required safety standards for their respective markets.

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