Equivalent & Substitute Parts for BK/MDL-2 Glass Cartridge Fuse

Part Overview

The BK/MDL-2 is a 2 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton Electronics Division. This component is classified as obsolete product status. The fuse requires a 3AB or 3AG holder and is designed for applications requiring 1/4" x 1-1/4" form factor protection. Due to its obsolete classification, equivalent and substitute parts from active product lines are necessary for ongoing system maintenance and new design implementations.

Substiute Parts

BK/MDL-2

Eaton - Electronics DivisionIn Stock: 886BK/MDL-2 Datasheet

Current PartRFQ

BK/MDL-2-R

Eaton - Electronics DivisionIn Stock: 1904BK/MDL-2-R Datasheet

DirectRFQ

MDL-2-R

Eaton - Electronics DivisionIn Stock: 819MDL-2-R Datasheet

DirectRFQ

BK/MDQ-2

Eaton - Electronics DivisionIn Stock: 1129BK/MDQ-2 Datasheet

Parametric EquivalentRFQ

MDQ-2

Eaton - Electronics DivisionIn Stock: 759MDQ-2 Datasheet

Parametric EquivalentRFQ

0034.5231

SCHURTER Inc.In Stock: 15430034.5231 Datasheet

DirectRFQ

0313002.HXIDP

Littelfuse Inc.In Stock: 11580313002.HXIDP Datasheet

Parametric EquivalentRFQ

0313002.HXP

Littelfuse Inc.In Stock: 16140313002.HXP Datasheet

Parametric EquivalentRFQ

0313002.MXP

Littelfuse Inc.In Stock: 17850313002.MXP Datasheet

Parametric EquivalentRFQ

0313002.VXIDP

Littelfuse Inc.In Stock: 9250313002.VXIDP Datasheet

Parametric EquivalentRFQ

0313002.VXP

LittelfuseIn Stock: 8100313002.VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the BK/MDL-2 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Size / Dimension: 0.250" Dia x 1.250" L (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Eaton Electronics Division): Parts BK/MDL-2-R and MDL-2-R are active-status variants of the original BK/MDL-2 design, maintaining identical electrical and mechanical specifications with improved RoHS3 compliance.

Parametric Equivalents (Alternative Manufacturers): Parts from Eaton (BK/MDQ-2, MDQ-2), SCHURTER (0034.5231), and Littelfuse (0313002.HXIDP, 0313002.HXP, 0313002.MXP, 0313002.VXIDP, 0313002.VXP) meet all critical substitution parameters and are functionally interchangeable within the 3AB/3AG holder system.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - Direct Manufacturer Replacement:

BK/MDL-2-R or MDL-2-R (Eaton Electronics Division) are the preferred substitutes for BK/MDL-2. Both parts maintain identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. These parts carry CE, CSA, and UL certifications, providing enhanced regulatory coverage compared to the original obsolete part.

Secondary Recommendation - Eaton Alternative Series:

BK/MDQ-2 (Eaton Electronics Division) provides functional equivalence with active product status. This part maintains 100A breaking capacity and CSA/UL certifications. Selection of this part is appropriate when BK/MDL-2-R or MDL-2-R are unavailable.

Alternative Manufacturer Options:

Littelfuse 313 series parts (0313002.HXIDP, 0313002.HXP, 0313002.MXP, 0313002.VXIDP, 0313002.VXP) are active-status alternatives with ROHS3 compliance and expanded certification coverage including PSE. These parts are suitable for applications requiring enhanced regulatory compliance or when Eaton parts are unavailable.

Not Recommended:

MDQ-2 (Eaton) exhibits reduced breaking capacity (35A versus 100A) and is not suitable as a direct substitute for applications requiring 100A breaking capacity.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-2-R be used as a direct replacement for BK/MDL-2?

A: Yes. BK/MDL-2-R maintains identical current rating (2 A), voltage rating (250 V AC), response time (Slow Blow), package format (3AB, 3AG, 1/4" x 1-1/4"), and breaking capacity (100A). The part is compatible with existing 3AB and 3AG holder systems.

Q: What is the difference between BK/MDL-2-R and MDL-2-R?

A: Both parts are manufactured by Eaton Electronics Division and share identical electrical and mechanical specifications. The primary difference is packaging designation. Both are active-status products with ROHS3 compliance and CE/CSA/UL certifications.

Q: Are Littelfuse 313 series fuses compatible with 3AB and 3AG holders?

A: Yes. Littelfuse 0313002.HXIDP, 0313002.HXP, 0313002.MXP, 0313002.VXIDP, and 0313002.VXP all conform to the 3AB, 3AG, 1/4" x 1-1/4" package specification and are mechanically compatible with standard holders designed for this form factor.

Q: Why is MDQ-2 not recommended as a substitute?

A: MDQ-2 has a breaking capacity of 35A, compared to 100A for BK/MDL-2. Applications requiring 100A breaking capacity cannot use this part.

Q: What compliance advantages do active-status substitutes offer?

A: Active-status parts such as BK/MDL-2-R, MDL-2-R, and Littelfuse 313 series components carry ROHS3 compliance and current regulatory certifications (CE, CSA, UL, PSE). Obsolete parts like BK/MDL-2 do not meet current environmental and safety standards.

Q: Can I use 0034.5231 (SCHURTER) as a substitute?

A: 0034.5231 meets all critical electrical and mechanical parameters and carries CSA/UL certifications with ROHS3 compliance. However, this part is classified as obsolete. Active-status alternatives are preferred for new designs and ongoing maintenance.

Q: Are there any DC voltage considerations for these fuses?

A: All substitute parts are rated for 250 V AC/DC operation. The 250 V AC rating applies to AC circuits; DC applications operate within the same voltage envelope.