Equivalent & Substitute Parts for MDQ-2 Glass Cartridge Fuse

Part Overview

The MDQ-2 is a 2 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 0.250" diameter by 1.250" length (6.35 mm × 31.75 mm). The MDQ-2 holds Active product status and is approved by CSA and UL agencies. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical package specifications, and functional performance characteristics to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" × 1-1/4"
Physical Dimensions	0.250" Dia × 1.250" L (6.35 mm × 31.75 mm)
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A (MDQ-2)

Substitute Part Grouping Explanation

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

Mandatory Matching Parameters:

Current Rating: 2 A
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Glass
Response Time: Slow Blow
Package / Case: 3AB, 3AG, 1/4" × 1-1/4"
Physical Dimensions: 0.250" Dia × 1.250" L (6.35 mm × 31.75 mm)
Mounting Type: Requires Holder

All identified substitute parts meet these mandatory electrical and mechanical parameters. Variations in breaking capacity, DC cold resistance, melting I²t, and compliance certifications are documented but do not prevent functional substitution within the specified electrical ratings.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage (A)	DC Cold Resistance (Ohms)	Product Status	Approval Agency
MDQ-2	Eaton - Electronics Division	2	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	35	0.1325	Active	CSA, UL
BK/MDL-2-R	Eaton - Electronics Division	2	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	0.116	Active	CE, CSA, UL
BK/MDQ-2	Eaton - Electronics Division	2	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	0.1325	Active	CSA, UL
0034.5231	SCHURTER Inc.	2	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	—	Obsolete	CSA, UL
0313002.HXP	Littelfuse Inc.	2	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	0.1169	Active	CE, CSA, PSE, UL
0313002.MXP	Littelfuse Inc.	2	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	0.1169	Active	CE, CSA, PSE, UL
0313002.VXP	Littelfuse	2	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	0.1169	Active	CE, CSA, PSE, UL

Engineering Selection Recommendations

Active Status Substitutes (Preferred): The following parts are recommended for direct substitution based on Active product status and current availability:

BK/MDL-2-R (Eaton - Electronics Division): Active status with CE, CSA, and UL approvals. Breaking capacity increased to 100 A. DC cold resistance 0.116 Ohms.
BK/MDQ-2 (Eaton - Electronics Division): Active status with CSA and UL approvals. Breaking capacity increased to 100 A. Identical DC cold resistance to original MDQ-2 at 0.1325 Ohms.
0313002.HXP (Littelfuse Inc.): Active status with CE, CSA, PSE, and UL approvals. Breaking capacity 100 A. DC cold resistance 0.1169 Ohms.
0313002.MXP (Littelfuse Inc.): Active status with CE, CSA, PSE, and UL approvals. Breaking capacity 100 A. DC cold resistance 0.1169 Ohms.
0313002.VXP (Littelfuse): Active status with CE, CSA, PSE, and UL approvals. Breaking capacity 100 A. DC cold resistance 0.1169 Ohms.

Obsolete Status (Not Recommended for New Designs):

0034.5231 (SCHURTER Inc.): Obsolete product status. Use only for legacy system maintenance where original part specifications are required.

All substitute parts maintain the mandatory electrical and mechanical parameters required for 3AB and 3AG holder compatibility and 2 A, 250 V AC/DC circuit protection.

Frequently Asked Questions (FAQ)

Q: Can BK/MDQ-2 be used as a direct replacement for MDQ-2? A: Yes. Both parts are manufactured by Eaton - Electronics Division, share identical current rating (2 A), voltage rating (250 V AC), response time (Slow Blow), package specification (3AB, 3AG, 1/4" × 1-1/4"), and DC cold resistance (0.1325 Ohms). The primary difference is increased breaking capacity (100 A vs. 35 A), which does not prevent substitution.

Q: What is the difference between the Littelfuse 0313002.HXP, 0313002.MXP, and 0313002.VXP variants? A: All three Littelfuse parts share identical electrical specifications: 2 A, 250 V AC, Slow Blow response, 3AB/3AG package, 100 A breaking capacity, and 0.1169 Ohms DC cold resistance. The part number suffix indicates different packaging or distribution variants. All are Active status and approved by CE, CSA, PSE, and UL.

Q: Is the MDQ-2 compatible with 3AB and 3AG holders? A: Yes. The MDQ-2 is designed for use in both 3AB and 3AG holders. The physical dimensions (0.250" diameter × 1.250" length) conform to both holder specifications. All substitute parts listed maintain this compatibility.

Q: Why does BK/MDL-2-R have a higher breaking capacity (100 A) than the original MDQ-2 (35 A)? A: Breaking capacity is the maximum current the fuse can safely interrupt at rated voltage. A higher breaking capacity indicates enhanced performance capability and does not affect the fuse's response at the rated 2 A current. The fuse will still operate identically at 2 A, 250 V AC/DC.

Q: Can I use 0034.5231 (SCHURTER) as a substitute? A: The 0034.5231 meets all mandatory electrical and mechanical parameters for substitution. However, it carries Obsolete product status. Use this part only for maintenance of existing systems where original specifications must be preserved. For new designs or ongoing production, select an Active status substitute.

Q: What is the significance of the DC cold resistance values? A: DC cold resistance is the resistance of the fuse element at room temperature before operation. Variations between 0.1169 Ohms and 0.1325 Ohms are within acceptable engineering tolerance for this fuse category and do not affect circuit protection performance at the 2 A rated current.

Q: Are all substitute parts RoHS compliant? A: RoHS compliance status varies. BK/MDL-2-R and all Littelfuse variants (0313002.HXP, 0313002.MXP, 0313002.VXP) are ROHS3 Compliant. BK/MDQ-2 is RoHS non-compliant. The original MDQ-2 does not specify RoHS status. Verify compliance requirements for your specific application before selection.

Q: Which substitute offers the broadest regulatory approval? A: The Littelfuse variants (0313002.HXP, 0313002.MXP, 0313002.VXP) carry the most comprehensive approvals: CE, CSA, PSE, and UL. These parts are suitable for applications requiring international regulatory compliance.

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