Equivalent & Substitute Parts for MDQ-7 Glass Cartridge Fuse

Part Overview

The MDQ-7 is a 7 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as Active product status and requires a 3AB or 3AG fuse holder for installation. The MDQ-7 is designed for circuit protection applications requiring slow-blow response characteristics with a 200 A breaking capacity at rated voltage.

Substitute parts are identified based on electrical equivalence across current rating, voltage rating, response time, package configuration, and mechanical dimensions. Alternative sources may be required due to supply chain considerations, inventory availability, or specific compliance requirements.

Key Parameters

Parameter	Value
Current Rating	7 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
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	200 A
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the MDQ-7 is determined by strict equivalence across the following parameters:

Mandatory Equivalence Criteria:

Current Rating: 7 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
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)
Breaking Capacity @ Rated Voltage: 200 A (exact match required)

All substitute parts listed below meet these mandatory criteria. Variations in secondary parameters such as DC Cold Resistance, Melting I²t, RoHS compliance status, and approval agency certifications do not disqualify substitution but may influence selection based on application-specific requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Size (Dia x L)	Breaking Capacity (A)	DC Cold Resistance (Ohms)	Product Status	Approval Agency
MDQ-7	Eaton - Electronics Division	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	200	0.01375	Active	CSA, UL
BK/MDQ-7	Eaton - Electronics Division	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	200	0.01375	Active	CSA, UL
MDL-7-R	Eaton - Electronics Division	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	200	0.018	Active	CE, CSA, UL
0034.5243	SCHURTER Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	200	Not Specified	Obsolete	CSA, UL
0313007.HXIDP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	200	0.0128	Active	CE, CSA, K-MARK, PSE, UL
0313007.HXP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	200	0.0128	Active	CE, CSA, K-MARK, PSE, UL
0313007.MXP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	200	0.0128	Active	CE, CSA, K-MARK, PSE, UL
0313007.VXP	Littelfuse Inc.	7	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	0.250" x 1.250" (6.35mm x 31.75mm)	200	0.0128	Active	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

Primary Selection (Active Status, Eaton Manufacturer): BK/MDQ-7 is electrically and mechanically identical to the MDQ-7 and maintains the same manufacturer source. This part is recommended as the first substitute option when MDQ-7 inventory is unavailable.

Secondary Selection (Active Status, Eaton Manufacturer, Extended Compliance): MDL-7-R is manufactured by Eaton - Electronics Division and carries Active product status. This part includes CE certification in addition to CSA and UL approvals, providing broader international compliance coverage. DC Cold Resistance is 0.018 Ohms compared to 0.01375 Ohms for the MDQ-7; this variation remains within acceptable substitution parameters.

Tertiary Selection (Active Status, Littelfuse Manufacturer): The Littelfuse 313 series parts (0313007.HXIDP, 0313007.HXP, 0313007.MXP, 0313007.VXP) are all Active status and provide the broadest approval agency coverage, including CE, CSA, K-MARK, PSE, and UL certifications. These parts feature DC Cold Resistance of 0.0128 Ohms and Melting I²t of 347. All four variants are electrically equivalent and differ only in packaging or internal construction designations.

Not Recommended for New Designs: 0034.5243 (SCHURTER Inc.) carries Obsolete product status and should not be selected for new circuit designs or long-term applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute MDQ-7 with BK/MDQ-7? A: Yes. BK/MDQ-7 is electrically and mechanically identical to MDQ-7 across all mandatory equivalence parameters: 7 A current rating, 250 V AC voltage rating, slow-blow response, 3AB/3AG package, and 0.250" x 1.250" dimensions. Both are manufactured by Eaton - Electronics Division and carry Active product status.

Q: What is the difference between MDL-7-R and MDQ-7? A: MDL-7-R meets all mandatory electrical and mechanical equivalence criteria. The primary differences are: (1) MDL-7-R includes CE certification in addition to CSA and UL; (2) DC Cold Resistance is 0.018 Ohms versus 0.01375 Ohms for MDQ-7. Both are Eaton products with Active status and 200 A breaking capacity.

Q: Are Littelfuse 313 series parts (0313007.HXIDP, 0313007.HXP, 0313007.MXP, 0313007.VXP) interchangeable with MDQ-7? A: Yes. All four Littelfuse variants meet mandatory equivalence criteria: 7 A, 250 V AC, slow-blow response, 3AB/3AG package, and 0.250" x 1.250" dimensions. All carry Active product status and 200 A breaking capacity. The variants differ in internal construction or packaging designation but are electrically equivalent for circuit protection applications.

Q: Why is 0034.5243 listed if it is Obsolete? A: 0034.5243 is included in the substitute list because it meets all mandatory electrical and mechanical equivalence parameters. However, Obsolete product status indicates this part is no longer in active production. Selection of this part should be limited to replacement applications in existing equipment where supply chain continuity is critical.

Q: Do all substitute parts fit in a 3AB or 3AG fuse holder? A: Yes. All substitute parts are specified with 3AB, 3AG, 1/4" x 1-1/4" package configuration and 0.250" Dia x 1.250" L dimensions. They are mechanically compatible with standard 3AB and 3AG fuse holders.

Q: What is the significance of DC Cold Resistance variation among substitute parts? A: DC Cold Resistance values range from 0.0128 Ohms (Littelfuse parts) to 0.018 Ohms (MDL-7-R) to 0.01375 Ohms (MDQ-7 and BK/MDQ-7). These variations reflect different internal conductor materials or construction methods but do not affect substitution eligibility. All values remain within acceptable parameters for 7 A slow-blow cartridge fuses.

Q: Which substitute part has the broadest international approval coverage? A: The Littelfuse 313 series parts (0313007.HXIDP, 0313007.HXP, 0313007.MXP, 0313007.VXP) carry the most comprehensive approval agency certifications: CE, CSA, K-MARK, PSE, and UL. This makes them suitable for applications requiring multi-regional compliance.

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