MDL-3/8-R Equivalent & Substitute Parts Reference

Part Overview

The MDL-3/8-R is a 375 mA, 250 V AC/DC slow-blow glass fuse cartridge manufactured by Eaton - Electronics Division. This component is classified as Active product status and is designed for use in 3AB and 3AG fuse holders with 1/4" x 1-1/4" dimensions. The part requires a compatible fuse holder for installation and operation. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval certifications to ensure direct functional equivalence in circuit protection applications.

Substiute Parts

MDL-3/8-R

Eaton - Electronics DivisionIn Stock: 945MDL-3/8-R Datasheet

Current PartRFQ

BK/MDL-3/8-R

Eaton - Electronics DivisionIn Stock: 1206BK/MDL-3/8-R Datasheet

DirectRFQ

0034.5217

SCHURTER Inc.In Stock: 9910034.5217 Datasheet

Parametric EquivalentRFQ

0313.375HXP

Littelfuse Inc.In Stock: 10580313.375HXP Datasheet

Parametric EquivalentRFQ

0313.375MXP

LittelfuseIn Stock: 37180313.375MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MDL-3/8-R are qualified based on the following criteria:

Electrical Parameters (Critical):

• Current Rating: 375 mA
• Voltage Rating (AC): 250 V
• Response Time: Slow Blow
• Breaking Capacity @ Rated Voltage: 35A

Mechanical Parameters (Critical):

• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Mounting Type: Requires Holder

Compliance Parameters:

• Approval Agency: CE, CSA, UL certifications
• RoHS Status: RoHS Compliant or ROHS3 Compliant

All identified substitute parts match these critical parameters and are therefore electrically and mechanically interchangeable with the MDL-3/8-R in applications requiring 375 mA, 250 V AC/DC slow-blow fuse cartridges in 3AB/3AG holders.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (Active Status): BK/MDL-3/8-R, 0313.375HXP, and 0313.375MXP are all Active product status components with full CE, CSA, and UL approval certifications. These parts provide current availability and manufacturer support. BK/MDL-3/8-R maintains the same manufacturer lineage as the original MDL-3/8-R with ROHS3 compliance. The Littelfuse parts (0313.375HXP and 0313.375MXP) offer equivalent electrical and mechanical specifications with ROHS3 compliance and full certification coverage.

Secondary Selection (Obsolete Status): 0034.5217 (SCHURTER Inc.) is classified as Obsolete product status. While it meets all electrical, mechanical, and dimensional requirements with CSA and UL certifications, its obsolete classification indicates limited future availability and potential discontinuation of manufacturer support.

Compliance Considerations: All substitute parts carry RoHS3 compliance or RoHS Compliant status, meeting environmental regulatory requirements. All parts maintain CE, CSA, and/or UL approval certifications required for circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-3/8-R be used as a direct replacement for MDL-3/8-R?

A: Yes. BK/MDL-3/8-R is manufactured by the same company (Eaton - Electronics Division) and matches all critical electrical parameters (375 mA, 250 V AC, slow-blow response), mechanical dimensions (0.250" Dia x 1.250" L), and package specifications (3AB, 3AG holders). Both parts carry identical approval certifications (CE, CSA, UL).

Q: What is the difference between 0313.375HXP and 0313.375MXP?

A: Both parts are manufactured by Littelfuse and share identical electrical ratings (375 mA, 250 V AC, slow-blow), mechanical dimensions, and approval certifications. The primary difference is inventory availability: 0313.375MXP has significantly higher stock (3666 Pcs) compared to 0313.375HXP (991 Pcs).

Q: Why is 0034.5217 listed as Obsolete?

A: 0034.5217 is classified as Obsolete product status by SCHURTER Inc. While it meets all electrical and mechanical specifications for substitution, obsolete status indicates the manufacturer no longer actively produces or supports this part. Future availability cannot be guaranteed.

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

A: Yes. All substitute parts are specified for 3AB and 3AG fuse holders with identical mechanical dimensions (0.250" Dia x 1.250" L / 6.35mm x 31.75mm). Physical installation compatibility is confirmed across all listed parts.

Q: Do all substitute parts carry the same approval certifications?

A: All substitute parts carry CSA and UL certifications. CE certification is present on MDL-3/8-R, BK/MDL-3/8-R, 0313.375HXP, and 0313.375MXP. 0034.5217 carries CSA and UL certifications only. For applications requiring CE certification, select from the four parts that include this approval.

Q: What is the significance of the Melting I²t values shown in the detailed specifications?

A: Melting I²t values indicate thermal energy absorption characteristics. While provided in the detailed specifications, all parts meet the 35A breaking capacity requirement at rated voltage. Melting I²t variations (0.982 to 1.38) reflect manufacturer-specific design differences but do not affect substitution eligibility for applications specified at 375 mA, 250 V AC/DC.