Equivalent & Substitute Parts for MDQ-3/10

Part Overview

The MDQ-3/10 is a 300 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for applications requiring overcurrent protection in 3AB and 3AG holder configurations with a 1/4" x 1-1/4" form factor. The part is currently active in production with 736 pieces in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance characteristics to ensure direct interchangeability in circuit protection applications.

Substiute Parts

MDQ-3/10

Eaton - Electronics DivisionIn Stock: 748MDQ-3/10 Datasheet

Current PartRFQ

BK/MDL-3/10-R

Eaton - Electronics DivisionIn Stock: 1402BK/MDL-3/10-R Datasheet

Parametric EquivalentRFQ

0034.5215

SCHURTER Inc.In Stock: 13780034.5215 Datasheet

Parametric EquivalentRFQ

0313.300HXP

Littelfuse Inc.In Stock: 9950313.300HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MDQ-3/10 are qualified based on the following critical parameters that determine functional interchangeability:

Electrical Parameters:

• Current Rating: 300 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 35A (exact match required)

Mechanical Parameters:

• 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)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Requires Holder (exact match required)

Compliance Parameters:

• Approval Agency: CSA and/or UL certification required

All substitute parts listed meet these criteria and are therefore electrically and mechanically interchangeable with the MDQ-3/10 in applications requiring 3AB/3AG holder compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: BK/MDL-3/10-R (Eaton - Electronics Division)

The BK/MDL-3/10-R is the preferred substitute for the MDQ-3/10. Both parts are manufactured by Eaton - Electronics Division and share identical electrical and mechanical specifications. The BK/MDL-3/10-R carries additional CE certification alongside CSA and UL approvals, and is ROHS3 compliant. This part is currently active in production with higher inventory availability (1334 pieces) compared to the MDQ-3/10.

Secondary Selection: 0313.300HXP (Littelfuse Inc.)

The 0313.300HXP manufactured by Littelfuse Inc. is an active product that meets all electrical and mechanical requirements for direct substitution. This part carries CE, CSA, and UL certifications and is ROHS3 compliant. It provides an alternative source from a different manufacturer with adequate inventory (957 pieces).

Alternative Selection: 0034.5215 (SCHURTER Inc.)

The 0034.5215 manufactured by SCHURTER Inc. meets all electrical and mechanical substitution criteria. However, this part is listed as obsolete and should be selected only when primary and secondary options are unavailable. It carries CSA and UL certifications and is ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can the BK/MDL-3/10-R be used as a direct replacement for the MDQ-3/10?

A: Yes. The BK/MDL-3/10-R is electrically and mechanically identical to the MDQ-3/10. Both parts have 300 mA current rating, 250 V AC voltage rating, slow-blow response time, and fit 3AB/3AG holders with identical 1/4" x 1-1/4" dimensions. Both are manufactured by Eaton - Electronics Division and carry CSA and UL certifications.

Q: What is the difference between the MDQ-3/10 and the 0313.300HXP?

A: The primary difference is the manufacturer. The MDQ-3/10 is manufactured by Eaton - Electronics Division, while the 0313.300HXP is manufactured by Littelfuse Inc. All electrical ratings (300 mA, 250 V AC, slow-blow, 35A breaking capacity) and mechanical specifications (3AB/3AG package, 1/4" x 1-1/4" dimensions) are identical. Both parts carry CSA and UL certifications.

Q: Why is the 0034.5215 listed as obsolete?

A: The 0034.5215 is marked as obsolete in the product status field. While it remains functionally equivalent to the MDQ-3/10 and meets all electrical and mechanical requirements, it is no longer in active production. The BK/MDL-3/10-R and 0313.300HXP are recommended as active alternatives.

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

A: Yes. All substitute parts listed are designed for 3AB and 3AG holder configurations with identical 1/4" x 1-1/4" (6.35mm x 31.75mm) dimensions. They are mechanically interchangeable in any application using these holder types.

Q: What certifications do the substitute parts carry?

A: The BK/MDL-3/10-R carries CE, CSA, and UL certifications. The 0313.300HXP carries CE, CSA, and UL certifications. The 0034.5215 carries CSA and UL certifications. All parts meet the minimum CSA and UL requirements of the original MDQ-3/10.

Q: Can I mix different manufacturers' fuses in the same application?

A: Yes. All substitute parts meet identical electrical ratings, mechanical dimensions, and approval standards. They are functionally equivalent and can be used interchangeably in applications requiring 300 mA, 250 V AC slow-blow cartridge fuses in 3AB/3AG holders.