BK/MDL-3/10 Equivalent & Substitute Parts

Part Overview

The BK/MDL-3/10 is a 300 mA, 250 V AC/DC slow-blow glass cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4"). This component requires a compatible fuse holder for installation and is designed for circuit protection applications requiring delayed response characteristics. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and procurement.

Substiute Parts

BK/MDL-3/10

Eaton - Electronics DivisionIn Stock: 1054BK/MDL-3/10 Datasheet

Current PartRFQ

BK/MDL-3/10-R

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

DirectRFQ

MDL-3/10-R

Eaton - Electronics DivisionIn Stock: 733MDL-3/10-R Datasheet

DirectRFQ

BK/MDQ-3/10

Eaton - Electronics DivisionIn Stock: 788BK/MDQ-3/10 Datasheet

Parametric EquivalentRFQ

MDQ-3/10

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

0313.300MXP

Littelfuse Inc.In Stock: 12240313.300MXP Datasheet

Parametric EquivalentRFQ

0313.300VXP

LittelfuseIn Stock: 9510313.300VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDL-3/10 is determined by strict equivalence across the following parameters: current rating (300 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package format (3AB/3AG), physical dimensions (0.250" Dia x 1.250" L), and breaking capacity (35A). All identified substitute parts meet these core electrical and mechanical requirements. Substitutes are grouped into two categories: direct manufacturer alternatives from Eaton Electronics Division and parametric equivalents from alternative manufacturers (SCHURTER Inc. and Littelfuse Inc.). Product status, RoHS compliance, and regulatory certifications are secondary selection criteria that do not affect functional interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: BK/MDL-3/10-R or MDL-3/10-R

The BK/MDL-3/10-R and MDL-3/10-R are direct Eaton Electronics Division alternatives with active product status. Both maintain identical electrical and mechanical specifications to the obsolete BK/MDL-3/10. The BK/MDL-3/10-R carries ROHS3 compliance and CE certification in addition to CSA and UL approvals. The MDL-3/10-R is RoHS compliant with CE, CSA, and UL certifications. Both parts are available in bulk packaging with substantial inventory levels (1334 and 637 units respectively).

Secondary Recommendation: Littelfuse 0313.300HXP, 0313.300MXP, or 0313.300VXP

The Littelfuse 313 series parts (0313.300HXP, 0313.300MXP, 0313.300VXP) are parametric equivalents with active product status and ROHS3 compliance. All three carry CE, CSA, and UL certifications. These parts are suitable for applications where multi-source qualification is required or where Littelfuse supply chain integration is preferred.

Alternative Recommendation: Eaton BK/MDQ-3/10 or MDQ-3/10

The Eaton MDQ series (BK/MDQ-3/10 and MDQ-3/10) are active parametric equivalents from the same manufacturer. Both maintain identical electrical specifications and package format. These parts are suitable where MDQ series qualification exists within system documentation.

Obsolete Status Consideration: 0034.5215

The SCHURTER 0034.5215 is classified as obsolete and carries ROHS3 compliance. While electrically and mechanically equivalent, this part should be selected only when existing system qualification specifically requires SCHURTER components or when supply chain continuity from existing inventory is critical.

Frequently Asked Questions (FAQ)

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

A: Yes. The BK/MDL-3/10-R is a direct manufacturer equivalent with identical current rating (300 mA), voltage rating (250 V AC), response time (slow blow), package format (3AB/3AG), and physical dimensions (0.250" Dia x 1.250" L). The primary difference is active product status and improved RoHS compliance.

Q: What is the difference between BK/MDL-3/10-R and MDL-3/10-R?

A: Both are Eaton direct equivalents with identical electrical and mechanical specifications. The BK/MDL-3/10-R carries ROHS3 compliance and CE certification. The MDL-3/10-R is RoHS compliant. Selection between these variants depends on specific regulatory requirements and supply chain preferences.

Q: Are Littelfuse 313 series fuses compatible with Eaton MDL series holders?

A: Yes. The Littelfuse 0313.300HXP, 0313.300MXP, and 0313.300VXP maintain identical package format (3AB/3AG) and physical dimensions (0.250" Dia x 1.250" L), ensuring mechanical compatibility with standard 3AB/3AG fuse holders.

Q: What is the significance of the melting I²t value differences between substitute parts?

A: The melting I²t value is provided in the technical data but does not affect substitution eligibility. All parts meet the 35A breaking capacity requirement at rated voltage. The I²t variations reflect different thermal characteristics within the slow-blow response classification.

Q: Can I substitute the BK/MDQ-3/10 for the BK/MDL-3/10?

A: Yes. The BK/MDQ-3/10 is a parametric equivalent with identical current rating, voltage rating, response time, package format, and breaking capacity. The MDQ designation indicates a different internal design series, but electrical and mechanical interchangeability is maintained.

Q: Which substitute part offers the best RoHS compliance?

A: The BK/MDL-3/10-R, Littelfuse 0313.300HXP, 0313.300MXP, and 0313.300VXP all carry ROHS3 compliance. The MDL-3/10-R is RoHS compliant. Selection should be based on specific system regulatory requirements rather than compliance level alone.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are available in bulk packaging. The original BK/MDL-3/10 packaging format is not specified in the technical data. Packaging selection should be coordinated with procurement requirements and inventory management practices.

Q: What certifications are common across all substitute parts?

A: CSA and UL certifications are present across all substitute parts. CE certification is present on BK/MDL-3/10-R, MDL-3/10-R, and all Littelfuse 313 series parts. The Eaton MDQ series and SCHURTER 0034.5215 carry CSA and UL certifications only.