MDL-25 Equivalent & Substitute Parts

Part Overview

The MDL-25 is a 25 A, 32 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton Electronics Division. This component is designed for use in 3AB and 3AG fuse holders with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The part maintains active product status and is currently in stock with 807 pieces available. Alternative equivalent and substitute parts are necessary to support supply chain flexibility, accommodate regional availability, and provide options across different manufacturer certifications and compliance standards.

Substiute Parts

MDL-25

Eaton - Electronics DivisionIn Stock: 862MDL-25 Datasheet

Current PartRFQ

BK/MDL-25

Eaton - Electronics DivisionIn Stock: 1104BK/MDL-25 Datasheet

Parametric EquivalentRFQ

0313025.MXP

Littelfuse Inc.In Stock: 18890313025.MXP Datasheet

SimilarRFQ

0313025.HXP

Littelfuse Inc.In Stock: 11680313025.HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDL-25 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 25 A
• Voltage Rating (AC): 32 V
• Fuse Type: Cartridge, Glass
• Response Time: Slow Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Mounting Type: Requires Holder
• Physical Dimensions: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)

All substitute parts listed meet these mandatory parameters. Variations in breaking capacity, DC cold resistance, melting I²t, RoHS compliance status, and operating temperature range do not disqualify substitution eligibility but are documented for engineering reference.

Parameter Comparison

Engineering Selection Recommendations

BK/MDL-25 (Eaton - Electronics Division): This part is a parametric equivalent to the MDL-25, manufactured by the same supplier. It maintains identical electrical and mechanical specifications, including current rating, voltage rating, fuse type, response time, and physical dimensions. Both parts carry CSA and UL approval. The BK/MDL-25 variant offers higher inventory availability (1,044 pieces) compared to the standard MDL-25 (807 pieces). Both parts share RoHS non-compliant status.

0313025.MXP (Littelfuse Inc.): This part meets all mandatory substitution parameters and is manufactured by Littelfuse Inc., a recognized fuse manufacturer. It carries UL approval and is ROHS3 compliant, providing an alternative for applications requiring RoHS compliance. The part specifies an operating temperature range of -55°C to 125°C and has the highest inventory availability (1,826 pieces). Breaking capacity is rated at 300 A, lower than the Eaton variants.

0313025.HXP (Littelfuse Inc.): This part is a parametric equivalent to the 0313025.MXP and shares identical electrical specifications, RoHS3 compliance status, UL approval, and operating temperature range. It provides an alternative sourcing option within the Littelfuse 313 series with 1,110 pieces in inventory.

Selection between these parts depends on supply chain requirements, compliance mandates, and manufacturer preference. All four parts are electrically and mechanically interchangeable within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can the BK/MDL-25 be used as a direct replacement for the MDL-25?

A: Yes. The BK/MDL-25 is a parametric equivalent manufactured by Eaton Electronics Division with identical current rating (25 A), voltage rating (32 V), fuse type (cartridge, glass), response time (slow blow), package designation (3AB, 3AG), and physical dimensions (0.250" Dia x 1.250" L). Both parts carry CSA and UL approval and are compatible with the same fuse holders.

Q: What is the difference between the Eaton MDL-25 variants and the Littelfuse 0313025 series?

A: All parts share identical mandatory electrical and mechanical parameters: 25 A current rating, 32 V AC voltage rating, slow-blow response, cartridge glass fuse type, and 3AB/3AG package compatibility. Key differences include manufacturer (Eaton vs. Littelfuse), breaking capacity (1 kA for Eaton; 300 A for Littelfuse), RoHS compliance status (non-compliant for Eaton; ROHS3 compliant for Littelfuse), and specified operating temperature range (-55°C to 125°C for Littelfuse; not specified for Eaton).

Q: Are the Littelfuse 0313025.MXP and 0313025.HXP interchangeable?

A: Yes. Both parts are parametric equivalents within the Littelfuse 313 series with identical electrical specifications, physical dimensions, RoHS3 compliance, UL approval, and operating temperature range. They differ only in part number designation and inventory availability.

Q: What does the 3AB, 3AG package designation mean?

A: The 3AB and 3AG designations refer to standardized fuse holder types compatible with this cartridge fuse. The physical dimensions of 1/4" diameter by 1-1/4" length (6.35mm x 31.75mm) are standardized for these holder types. All substitute parts conform to these same dimensional and holder compatibility specifications.

Q: Should RoHS compliance status influence part selection?

A: RoHS compliance status is determined by application requirements and regulatory mandates. The MDL-25 and BK/MDL-25 are RoHS non-compliant, while the Littelfuse 0313025.MXP and 0313025.HXP are ROHS3 compliant. Selection depends on whether the end application or market requires RoHS compliance.

Q: What is the significance of breaking capacity differences?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. The Eaton variants (MDL-25, BK/MDL-25) are rated at 1 kA, while the Littelfuse variants (0313025.MXP, 0313025.HXP) are rated at 300 A. Both ratings are provided by the manufacturers and reflect their respective design specifications. Selection depends on the circuit's maximum available fault current.

Q: Can these fuses be used in DC applications?

A: The specifications indicate these are 25 A, 32 V AC/DC fuses. DC cold resistance values are provided for all parts, confirming DC application capability. However, the voltage rating of 32 V applies to both AC and DC circuits.