MDA-25A Equivalent & Substitute Parts Reference

Part Overview

The MDA-25A is a ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated for 25A at 250VAC and 125VDC with 3AB package configuration. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and component sourcing. The MDA-25A operates as a slow-blow AC/DC fuse designed for circuit protection applications requiring dual voltage operation capability.

Substiute Parts

MDA-25A

Eaton - Electronics DivisionIn Stock: 1039MDA-25A Datasheet

Current PartRFQ

MDA-25-R

Eaton - Electronics DivisionIn Stock: 838MDA-25-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MDA-25A is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Current Rating: 25 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Voltage Rating - DC: 125 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)

The MDA-25-R qualifies as a direct substitute for the MDA-25A because it maintains identical electrical ratings (25A, 250VAC, 125VDC), identical fuse construction (ceramic cartridge), identical response characteristic (slow blow), and identical physical package dimensions (3AB, 3AG, 1/4" x 1-1/4"). The primary distinction is product status: MDA-25-R is active production, whereas MDA-25A is obsolete.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: MDA-25-R

The MDA-25-R is the direct functional equivalent for the obsolete MDA-25A. Selection of MDA-25-R is based on:

1. Electrical Equivalence: Identical current rating (25A), AC voltage rating (250V), and DC voltage rating (125V) ensure direct circuit compatibility without modification.

2. Mechanical Compatibility: Identical package specification (3AB, 3AG, 1/4" x 1-1/4") confirms physical fit in existing fuse holders without adapter or modification.

3. Functional Equivalence: Identical fuse type (ceramic cartridge) and response characteristic (slow blow) ensure identical circuit protection behavior and response to overcurrent conditions.

4. Product Status: MDA-25-R is in active production, ensuring long-term availability and supply chain reliability compared to the obsolete MDA-25A.

5. Compliance Enhancement: MDA-25-R carries ROHS3 compliance and CE, CSA, UL approvals, providing superior regulatory alignment compared to the non-compliant MDA-25A.

For applications where RoHS compliance is not a requirement and existing inventory of MDA-25A is available, continued use of MDA-25A is electrically and mechanically valid. However, for new designs, system upgrades, or long-term maintenance planning, MDA-25-R is the recommended selection.

Frequently Asked Questions (FAQ)

Q: Can MDA-25-R be used as a direct replacement for MDA-25A without circuit modification?

A: Yes. MDA-25-R is electrically and mechanically equivalent to MDA-25A. Both components share identical current rating (25A), voltage ratings (250VAC, 125VDC), fuse type (ceramic cartridge), response time (slow blow), and package dimensions (3AB, 3AG, 1/4" x 1-1/4"). No circuit modification is required.

Q: What is the primary difference between MDA-25A and MDA-25-R?

A: The primary differences are product status and regulatory compliance. MDA-25A is obsolete and RoHS non-compliant. MDA-25-R is in active production and ROHS3 compliant with CE, CSA, and UL approvals.

Q: Will MDA-25-R fit in existing MDA-25A fuse holders?

A: Yes. Both components use identical package specification (3AB, 3AG, 1/4" x 1-1/4"), ensuring physical compatibility with the same fuse holder without modification or adapter.

Q: Are there any electrical performance differences between MDA-25A and MDA-25-R?

A: No electrical performance differences exist for the specified parameters. Both components are rated for 25A at 250VAC and 125VDC with slow-blow response. MDA-25-R provides additional specification data including breaking capacity (1.5kA AC, 10kA DC) and DC cold resistance (0.00305 Ohms), but these represent enhanced documentation rather than functional differences.

Q: Is MDA-25-R suitable for new equipment designs?

A: Yes. MDA-25-R is the appropriate selection for new designs. It is in active production, carries current regulatory certifications (ROHS3, CE, CSA, UL), and provides long-term supply chain availability.

Q: What mounting configuration does MDA-25-R require?

A: MDA-25-R is a cartridge fuse that requires a fuse holder. It is not a plug-in component. The holder must accommodate the 3AB, 3AG package specification with 1/4" diameter and 1-1/4" length dimensions.