Equivalent & Substitute Parts for MDQ-6 Fuse Cartridge

Part Overview

The MDQ-6 is a 6 A, 250 V AC/DC slow-blow glass fuse cartridge 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 and is stocked with 1,009 units available. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained, allowing for component interchangeability in applications where the original part number becomes unavailable or when alternative sourcing is required.

Key Parameters

Parameter	Value
Current Rating	6 A
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	200 A
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Approval Agency	CSA, UL

Substitute Part Grouping Explanation

Substitute parts for the MDQ-6 are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Mandatory Matching Parameters:

Current Rating: 6 A
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: 200 A
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 secondary characteristics such as DC Cold Resistance, compliance certifications, and RoHS status do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Parameter	MDQ-6	BK/MDL-6-R	BK/MDQ-6
Manufacturer	Eaton - Electronics Division	Eaton - Electronics Division	Eaton - Electronics Division
Series	MDQ	MDL	MDQ
Current Rating (Amps)	6 A	6 A	6 A
Voltage Rating - AC	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	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"
Breaking Capacity @ Rated Voltage	200 A	200 A	200 A
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)
DC Cold Resistance	0.01715 Ohms	0.022 Ohms	0.01715 Ohms
Mounting Type	Requires Holder	Requires Holder	Requires Holder
Product Status	Active	Active	Active
Approval Agency	CSA, UL	CE, CSA, UL	CSA, UL
Inventory (Pcs)	1,009	3,255	988

Engineering Selection Recommendations

MDQ-6 (Primary Part): The MDQ-6 maintains Active product status with CSA and UL approval certifications. This part is suitable for applications requiring standard North American compliance. Current inventory of 1,009 units supports immediate availability.

BK/MDL-6-R (Substitute - Extended Compliance): The BK/MDL-6-R is functionally equivalent to the MDQ-6 with identical electrical and mechanical specifications. This substitute provides expanded approval coverage with CE, CSA, and UL certifications, making it suitable for applications requiring European compliance in addition to North American standards. The higher inventory level of 3,255 units ensures sustained availability. RoHS3 compliance and REACH Unaffected status provide additional regulatory alignment for certain markets.

BK/MDQ-6 (Substitute - Same Series): The BK/MDQ-6 is a direct series equivalent within the MDQ family, maintaining identical electrical and mechanical parameters to the primary part. This substitute shares the same CSA and UL certifications as the MDQ-6. Inventory of 988 units provides comparable availability to the primary part.

All three parts are functionally interchangeable within applications designed for 6 A, 250 V AC/DC slow-blow fuse cartridges in 3AB/3AG holders.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-6-R be used as a direct replacement for MDQ-6?

A: Yes. The BK/MDL-6-R meets all mandatory electrical and mechanical parameters: 6 A current rating, 250 V AC voltage rating, slow-blow response time, cartridge glass fuse type, 3AB/3AG package compatibility, 200 A breaking capacity, and 0.250" Dia x 1.250" L dimensions. Physical installation in existing 3AB and 3AG fuse holders is identical.

Q: What is the difference between MDQ-6 and BK/MDQ-6?

A: Both parts are from the MDQ series with identical electrical specifications and mechanical dimensions. The primary difference is inventory availability and RoHS compliance status. BK/MDQ-6 is RoHS non-compliant, while MDQ-6 does not specify RoHS status. Both maintain CSA and UL certifications.

Q: Why does BK/MDL-6-R have different DC Cold Resistance?

A: DC Cold Resistance (0.022 Ohms for BK/MDL-6-R versus 0.01715 Ohms for MDQ-6) reflects manufacturing tolerances within the MDL series design. This parameter does not affect substitution eligibility, as both values remain within acceptable ranges for 6 A fuse cartridge operation at rated voltage and current.

Q: Is BK/MDL-6-R suitable for European applications?

A: Yes. BK/MDL-6-R includes CE certification in addition to CSA and UL approvals, making it suitable for applications requiring European compliance. It is also RoHS3 compliant and REACH Unaffected.

Q: Can these fuses be used without a holder?

A: No. All three parts require a 3AB or 3AG fuse holder for installation. The Mounting Type specification "Requires Holder" is mandatory for all equivalent and substitute parts.

Q: Are all three parts in active production?

A: Yes. MDQ-6, BK/MDL-6-R, and BK/MDQ-6 all maintain Active product status with current inventory levels supporting availability.

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