Equivalent & Substitute Parts for MDL-1/2-R Glass Cartridge Fuse

Part Overview

The MDL-1/2-R is a 500 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton Electronics Division. This component is designed for circuit protection in applications requiring a 3AB/3AG holder format with 1/4" x 1-1/4" dimensions. The part maintains Active product status with 1068 units in current inventory.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, enabling direct replacement in compatible holder assemblies without circuit redesign.

Substiute Parts

MDL-1/2-R

Eaton - Electronics DivisionIn Stock: 1121MDL-1/2-R Datasheet

Current PartRFQ

BK/MDL-1/2-R

Eaton - Electronics DivisionIn Stock: 1229BK/MDL-1/2-R Datasheet

DirectRFQ

BK/MDQ-1/2

Eaton - Electronics DivisionIn Stock: 869BK/MDQ-1/2 Datasheet

Parametric EquivalentRFQ

0313.500MXP

Littelfuse Inc.In Stock: 49370313.500MXP Datasheet

SimilarRFQ

0313.500HXIDP

Littelfuse Inc.In Stock: 8530313.500HXIDP Datasheet

Parametric EquivalentRFQ

0313.500HXP

Littelfuse Inc.In Stock: 23640313.500HXP Datasheet

Parametric EquivalentRFQ

0313.500VXP

Littelfuse Inc.In Stock: 10450313.500VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

• Current Rating: 500 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Breaking Capacity @ Rated Voltage: 35A (exact match required)

All identified substitute parts meet these criteria. Variations in secondary parameters such as DC Cold Resistance, Melting I²t, RoHS compliance status, and approval agency certifications do not disqualify substitution but are documented for engineering reference.

Parameter Comparison

Engineering Selection Recommendations

Direct Manufacturer Equivalent (Eaton Electronics Division)

BK/MDL-1/2-R is the direct equivalent to MDL-1/2-R, manufactured by the same supplier. Both parts share identical electrical parameters, breaking capacity, and DC cold resistance. BK/MDL-1/2-R carries ROHS3 compliance status and maintains CE, CSA, and UL certifications. Inventory availability is 1130 units.

Parametric Equivalent (Eaton Electronics Division)

BK/MDQ-1/2 meets all critical electrical and mechanical substitution criteria. This part is certified by CSA and UL. DC cold resistance is 1.4 Ohms compared to 0.943 Ohms in the main part. RoHS non-compliance status should be evaluated against application requirements. Inventory availability is 773 units.

Parametric Equivalents (Littelfuse Inc.)

The 0313 series fuses (0313.500MXP, 0313.500HXIDP, 0313.500HXP, 0313.500VXP) are manufactured by Littelfuse Inc. and meet all critical substitution parameters. All four variants carry ROHS3 compliance and CE, CSA, UL certifications. DC cold resistance is 1.26 Ohms across all variants. Melting I²t is 2.55 compared to 1.656 in the main part. Operating temperature range is specified as -55°C to 125°C. Combined inventory across these four variants exceeds 8900 units.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-1/2-R be used as a direct replacement for MDL-1/2-R?

A: Yes. BK/MDL-1/2-R is manufactured by Eaton Electronics Division and shares identical electrical specifications, breaking capacity, and physical dimensions with MDL-1/2-R. Both parts are certified by CE, CSA, and UL. The primary difference is RoHS compliance status (ROHS3 vs. RoHS Compliant).

Q: What is the difference between Eaton and Littelfuse substitute parts?

A: All substitute parts meet the critical electrical and mechanical parameters required for 3AB/3AG holder compatibility. Littelfuse variants (0313 series) have higher Melting I²t values (2.55 vs. 1.656) and specified operating temperature range (-55°C to 125°C). DC cold resistance differs across manufacturers: Eaton MDL-1/2-R is 0.943 Ohms, Eaton BK/MDQ-1/2 is 1.4 Ohms, and Littelfuse 0313 series is 1.26 Ohms.

Q: Are all substitute parts RoHS compliant?

A: No. BK/MDQ-1/2 is RoHS non-compliant. All other substitutes (BK/MDL-1/2-R and the 0313 series from Littelfuse) carry ROHS3 compliance status.

Q: Can these fuses be used in any 3AB/3AG holder?

A: Yes. All listed parts share identical package specifications (3AB, 3AG, 1/4" x 1-1/4") and are designed for holders requiring this format. Physical dimensions are 0.250" diameter x 1.250" length across all variants.

Q: What is the significance of DC Cold Resistance differences?

A: DC cold resistance values are provided for engineering reference. Variations (0.943 Ohms for MDL-1/2-R, 1.4 Ohms for BK/MDQ-1/2, and 1.26 Ohms for Littelfuse 0313 series) reflect manufacturing differences but do not affect substitution eligibility, as all parts meet the 35A breaking capacity requirement at rated voltage.

Q: Which substitute has the highest inventory availability?

A: Littelfuse 0313.500MXP has 4917 units in stock, the highest among all listed substitutes.