Equivalent & Substitute Parts for MDL-4/10-R Glass Cartridge Fuse

Part Overview

The MDL-4/10-R is a 400 mA, 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 1/4" x 1-1/4" (6.35mm x 31.75mm). The part is currently active in production with 1032 pieces in stock inventory.

Equivalent and substitute parts are necessary when the primary MDL-4/10-R becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from multiple qualified manufacturers. Substitute parts must maintain identical electrical ratings and mechanical compatibility to ensure proper circuit protection without modification to existing holder assemblies.

Substiute Parts

MDL-4/10-R

Eaton - Electronics DivisionIn Stock: 1084MDL-4/10-R 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 eligibility for the MDL-4/10-R is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Current Rating: 400 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (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)
• Mounting Type: Requires Holder (exact match required)

Compliance Parameters:

• Fuse Type: Cartridge, Glass (exact match required)
• RoHS Status: RoHS Compliant or ROHS3 Compliant (acceptable)

All substitute parts listed below meet these criteria and are therefore direct functional equivalents suitable for direct replacement in applications using the MDL-4/10-R.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (Active Status): The BK/MDL-4/10-R from Eaton - Electronics Division is the preferred substitute when MDL-4/10-R availability is constrained. Both parts are manufactured by the same supplier, share identical electrical and mechanical specifications, and maintain active production status. The BK/MDL-4/10-R carries ROHS3 Compliant certification with MSL rating of 1 (Unlimited), indicating superior moisture handling characteristics.

Secondary Selection (Active Status): The 0313.400MXP from Littelfuse Inc. is an active production alternative with the highest current inventory level (2314 pieces). This part meets all electrical and mechanical equivalence criteria and carries multiple approval certifications (CE, CSA, UL). The 0313.400MXP is suitable for applications requiring third-party manufacturer qualification or multi-source supply strategies.

Obsolete Status Consideration: The SCHURTER Inc. parts 0034.3413 and 0034.5218 are classified as obsolete. While they maintain full electrical and mechanical equivalence to the MDL-4/10-R, their obsolete status indicates discontinued production. These parts should be selected only when existing inventory must be consumed or when legacy system maintenance requires exact historical part matching.

Frequently Asked Questions (FAQ)

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

A: Yes. The BK/MDL-4/10-R is a direct functional equivalent. Both parts share identical current rating (400 mA), voltage rating (250 V AC), response time (Slow Blow), and mechanical package (3AB, 3AG, 1/4" x 1-1/4"). No circuit modifications or holder changes are required.

Q: What is the difference between MDL-4/10-R and BK/MDL-4/10-R?

A: Both parts are manufactured by Eaton - Electronics Division and are electrically and mechanically identical. The primary differences are RoHS certification level (RoHS Compliant versus ROHS3 Compliant) and MSL rating (Not Applicable versus 1 - Unlimited). The BK variant offers enhanced moisture sensitivity protection.

Q: Can Littelfuse 0313.400MXP replace the Eaton MDL-4/10-R?

A: Yes. The 0313.400MXP meets all electrical and mechanical equivalence requirements. It carries active production status and holds CE, CSA, and UL certifications. Selection of this part is appropriate for multi-source supply strategies or when Littelfuse qualification is required by design specifications.

Q: Why are SCHURTER parts listed as obsolete?

A: The 0034.3413 and 0034.5218 from SCHURTER Inc. are classified as obsolete, indicating discontinued production. These parts remain electrically and mechanically equivalent but should be selected only for legacy system maintenance or when consuming existing inventory.

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

A: Yes. All listed substitute parts maintain the identical mechanical package specification (3AB, 3AG, 1/4" x 1-1/4") and physical dimensions (0.250" Dia x 1.250" L / 6.35mm x 31.75mm). No holder modifications are required for any substitute part.

Q: What certifications apply to the substitute parts?

A: The BK/MDL-4/10-R carries ROHS3 Compliant certification. The 0313.400MXP from Littelfuse carries CE, CSA, and UL certifications. The SCHURTER parts (0034.3413 and 0034.5218) carry CE certification. All parts are REACH Unaffected and classified as EAR99 for export control purposes.