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

Part Overview

The BK/MDQ-1 is a 1 A, 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 part is currently active in production with 925 pieces in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when supply chain optimization is required, or when design flexibility allows for alternative manufacturers meeting identical electrical and mechanical specifications. All substitute parts listed maintain the same current rating, voltage rating, response time, package configuration, and breaking capacity as the main part.

Key Parameters

Parameter	Value
Current Rating	1 A
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	35 A
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDQ-1 is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Current Rating: 1 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Breaking Capacity @ Rated Voltage: 35 A (exact match required)
Response Time: Slow Blow (exact match required)

Mechanical Parameters:

Fuse Type: Cartridge, Glass (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 / 6.35mm x 31.75mm (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed below meet these criteria and are therefore electrically and mechanically interchangeable with the BK/MDQ-1 in applications requiring a 1 A, 250 V AC/DC slow-blow glass cartridge fuse in a 3AB/3AG holder configuration.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Breaking Capacity (A)	DC Cold Resistance (Ohms)	RoHS Status	Approval Agency	Inventory (Pcs)
BK/MDQ-1	Eaton - Electronics Division	1	250	Slow Blow	35	0.374	RoHS non-compliant	CSA, UL	925
BK/MDL-1-R	Eaton - Electronics Division	1	250	Slow Blow	35	0.273	ROHS3 Compliant	CE, CSA, UL	2701
MDL-1-R	Eaton - Electronics Division	1	250	Slow Blow	35	0.273	ROHS3 Compliant	CE, CSA, UL	1015
0313001.HXIDP	Littelfuse Inc.	1	250	Slow Blow	35	0.375	ROHS3 Compliant	CE, CSA, PSE, UL	1144
0313001.HXP	Littelfuse Inc.	1	250	Slow Blow	35	0.375	ROHS3 Compliant	CE, CSA, PSE, UL	12346
0313001.MXP	Littelfuse Inc.	1	250	Slow Blow	35	0.375	ROHS3 Compliant	CE, CSA, PSE, UL	3200
0313001.VXP	Littelfuse Inc.	1	250	Slow Blow	35	0.375	ROHS3 Compliant	CE, CSA, PSE, UL	948

Engineering Selection Recommendations

Eaton - Electronics Division Substitutes (BK/MDL-1-R, MDL-1-R):

The BK/MDL-1-R and MDL-1-R are direct substitutes from the same manufacturer. Both parts are ROHS3 compliant, whereas the BK/MDQ-1 is RoHS non-compliant. Both substitute parts carry CE certification in addition to CSA and UL approvals. The BK/MDL-1-R offers the highest inventory availability at 2701 pieces. These parts are suitable for applications where RoHS3 compliance is required or preferred.

Littelfuse Inc. Substitutes (0313001.HXIDP, 0313001.HXP, 0313001.MXP, 0313001.VXP):

All four Littelfuse parts are ROHS3 compliant and carry CE, CSA, PSE, and UL certifications. The 0313001.HXP variant has the highest inventory level at 12346 pieces, providing superior supply chain availability. All Littelfuse substitutes are rated for operating temperatures from -55°C to 125°C. These parts are suitable for applications requiring multi-agency certification or extended temperature range operation.

Compliance Considerations:

Applications subject to RoHS3 regulations should utilize BK/MDL-1-R, MDL-1-R, or any Littelfuse variant. Applications requiring PSE certification should use Littelfuse parts. All substitute parts maintain identical electrical and mechanical specifications with the BK/MDQ-1.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-1-R be used as a direct replacement for BK/MDQ-1?

A: Yes. Both parts share identical electrical ratings (1 A, 250 V AC/DC), response time (slow blow), breaking capacity (35 A), and mechanical package (3AB/3AG, 1/4" x 1-1/4"). The primary difference is RoHS3 compliance status and additional CE certification on the BK/MDL-1-R.

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

A: Both manufacturers provide electrically and mechanically equivalent parts. Littelfuse variants include PSE certification and specify an operating temperature range of -55°C to 125°C. Eaton variants do not specify operating temperature. Littelfuse parts offer higher inventory availability, particularly the 0313001.HXP variant.

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

A: Yes. All substitute parts are specified for 3AB and 3AG holders with identical dimensions of 0.250" diameter x 1.250" length (6.35mm x 31.75mm). Physical and electrical compatibility is guaranteed.

Q: Does DC cold resistance variation affect substitution eligibility?

A: DC cold resistance values vary slightly among substitutes (0.273 to 0.375 Ohms) but remain within acceptable ranges for this fuse category. All parts maintain the same current rating, voltage rating, and breaking capacity. Substitution is valid from an electrical performance standpoint.

Q: Which substitute part offers the best supply availability?

A: The 0313001.HXP (Littelfuse) offers the highest inventory at 12346 pieces, followed by BK/MDL-1-R (Eaton) at 2701 pieces.

Q: Are substitute parts suitable for new designs?

A: Yes. All substitute parts are active products with current manufacturing status. Selection should be based on compliance requirements (RoHS3, CE, PSE), certification needs, and supply chain considerations.

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