Equivalent & Substitute Parts for MDQ-4/10

Part Overview

The MDQ-4/10 is a 400 mA, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for 3AB and 3AG holder applications with dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm). The part is currently active in production with 782 pieces in stock.

Equivalent and substitute parts are necessary when the primary MDQ-4/10 becomes unavailable, when alternative manufacturers are required for supply chain continuity, or when design flexibility permits selection from multiple qualified sources meeting identical electrical and mechanical specifications.

Substiute Parts

MDQ-4/10

Eaton - Electronics DivisionIn Stock: 885MDQ-4/10 Datasheet

Current PartRFQ

BK/MDL-4/10-R

Eaton - Electronics DivisionIn Stock: 1160BK/MDL-4/10-R Datasheet

Parametric EquivalentRFQ

0034.3413

SCHURTER Inc.In Stock: 11420034.3413 Datasheet

Parametric EquivalentRFQ

0034.5218

SCHURTER Inc.In Stock: 12300034.5218 Datasheet

Parametric EquivalentRFQ

0313.400MXP

Littelfuse Inc.In Stock: 24190313.400MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MDQ-4/10 is determined by strict equivalence across the following parameters:

• Current Rating: 400 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Physical Dimensions: 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 without exception. Substitutes are grouped by manufacturer and product status to facilitate selection based on availability and supply chain requirements.

Parameter Comparison

Engineering Selection Recommendations

Active Status Parts:

The MDQ-4/10 (Eaton - Electronics Division) and 0313.400MXP (Littelfuse Inc.) are both active products with current manufacturing status. The BK/MDL-4/10-R (Eaton - Electronics Division) is also active. These parts are preferred for new designs and ongoing production requirements due to assured supply availability.

Obsolete Status Parts:

The 0034.3413 and 0034.5218 (both SCHURTER Inc.) are obsolete products. These parts are suitable only for replacement or repair of existing equipment where supply from remaining inventory is available. New designs should not incorporate obsolete parts.

Compliance and Certifications:

The MDQ-4/10 carries CSA and UL approvals. The 0313.400MXP carries CE, CSA, and UL approvals, providing the broadest regulatory coverage. The BK/MDL-4/10-R does not specify approval agencies. The SCHURTER parts (0034.3413 and 0034.5218) carry CE approval only.

Supply Availability:

Current inventory levels are: MDQ-4/10 (782 pcs), BK/MDL-4/10-R (1128 pcs), 0034.3413 (1096 pcs), 0034.5218 (1177 pcs), and 0313.400MXP (2314 pcs).

Frequently Asked Questions (FAQ)

Q: Can the BK/MDL-4/10-R be used as a direct replacement for the MDQ-4/10?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and meet identical electrical specifications: 400 mA, 250 V AC, slow-blow response, and 3AB/3AG package dimensions. Both are active products. The BK/MDL-4/10-R has higher current inventory availability.

Q: Are the SCHURTER parts (0034.3413 and 0034.5218) suitable for new equipment designs?

A: No. Both SCHURTER parts are marked as obsolete. They are suitable only for replacement of existing equipment where supply from remaining inventory is available. New designs must use active products: MDQ-4/10, BK/MDL-4/10-R, or 0313.400MXP.

Q: What is the difference between the Littelfuse 0313.400MXP and the Eaton MDQ-4/10?

A: Both parts are electrically and mechanically identical: 400 mA, 250 V AC, slow-blow, 3AB/3AG package, and 35A breaking capacity. The primary differences are manufacturer and regulatory approvals. The 0313.400MXP carries CE, CSA, and UL approvals, while the MDQ-4/10 carries CSA and UL approvals. Both are active products.

Q: Will these substitute parts fit in existing 3AB and 3AG fuse holders?

A: Yes. All substitute parts are specified for 3AB and 3AG holder applications with identical physical dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm). They are mechanically interchangeable.

Q: What is the significance of the slow-blow response time?

A: Slow-blow response time is a critical parameter that determines the fuse's ability to tolerate temporary inrush currents without nuisance operation. All listed parts share this characteristic and are therefore functionally equivalent in this regard.

Q: Can I substitute a different current rating or voltage rating?

A: No. Current rating and voltage rating are non-interchangeable parameters. The MDQ-4/10 is specifically rated for 400 mA at 250 V AC. Substitution with different ratings will result in improper circuit protection and potential safety hazards.