Equivalent & Substitute Parts for MDA-1/8-R Ceramic Cartridge Fuse

Part Overview

The Eaton MDA-1/8-R is a 125 mA, 250 V AC/DC ceramic cartridge fuse with slow-blow response characteristics, designed for 3AB and 3AG holder compatibility. This fuse is classified as obsolete product status. Identification of active equivalent components is necessary to ensure continued availability and supply chain continuity for applications requiring this electrical protection specification.

Substiute Parts

MDA-1/8-R

Eaton - Electronics DivisionIn Stock: 979MDA-1/8-R Datasheet

Current PartRFQ

0326.125HXP

Littelfuse Inc.In Stock: 6940326.125HXP Datasheet

DirectRFQ

0326.125MXP

Littelfuse Inc.In Stock: 9370326.125MXP Datasheet

DirectRFQ

0326.125VXP

Littelfuse Inc.In Stock: 9960326.125VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MDA-1/8-R is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Parameters:

• Current Rating: 125 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)

Mechanical Parameters:

• Fuse Type: Cartridge, Ceramic (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Size / Dimension: 0.250" Dia x 1.250" L (exact match required)
• Mounting Type: Requires Holder (exact match required)

Compliance Parameters:

• RoHS Status: ROHS3 Compliant (exact match required)

All three substitute parts from Littelfuse Inc. (0326.125HXP, 0326.125MXP, 0326.125VXP) meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

The three Littelfuse 326 series ceramic cartridge fuses (0326.125HXP, 0326.125MXP, 0326.125VXP) are direct functional equivalents to the obsolete Eaton MDA-1/8-R. All substitute parts are classified as active products with current manufacturing availability.

Compliance Advantages of Substitute Parts:

• All substitute parts carry CE approval certification, providing additional regulatory compliance documentation
• All substitute parts maintain ROHS3 compliance status equivalent to the original part
• All substitute parts include specified operating temperature range (-55°C ~ 125°C) and DC cold resistance (22.45 Ohms), providing enhanced technical documentation for design verification

The transition from the obsolete MDA-1/8-R to any of the three active Littelfuse equivalents presents no electrical or mechanical incompatibility. Selection among the three substitute part numbers may be determined by packaging preferences, inventory availability, or supply chain logistics, as all three are electrically and mechanically identical.

Frequently Asked Questions (FAQ)

Q: Are the Littelfuse 0326.125HXP, 0326.125MXP, and 0326.125VXP fuses direct replacements for the Eaton MDA-1/8-R?

A: Yes. All three Littelfuse parts are direct functional equivalents. They share identical electrical ratings (125 mA, 250 V AC), fuse type (ceramic cartridge), response time (slow blow), mechanical dimensions (0.250" Dia x 1.250" L), and holder compatibility (3AB, 3AG).

Q: What is the difference between the three Littelfuse substitute part numbers?

A: The three part numbers (0326.125HXP, 0326.125MXP, 0326.125VXP) are electrically and mechanically identical. Differences are limited to packaging configuration or internal manufacturing variants within the Littelfuse 326 series. All three are classified as active products.

Q: Will the substitute fuses work in existing 3AB and 3AG holders designed for the MDA-1/8-R?

A: Yes. The substitute fuses maintain the identical package specification (3AB, 3AG, 1/4" x 1-1/4") and physical dimensions (0.250" Dia x 1.250" L), ensuring full mechanical compatibility with existing holder assemblies.

Q: What certifications do the substitute parts carry?

A: The Littelfuse 326 series fuses carry CE approval certification. All parts maintain ROHS3 compliance status. The substitute parts also include REACH Unaffected status documentation.

Q: Is there any performance difference between the MDA-1/8-R and the Littelfuse substitutes?

A: The electrical and mechanical performance specifications are equivalent. The Littelfuse substitutes provide additional technical documentation including breaking capacity (100A), melting I²t (0.1), operating temperature range (-55°C ~ 125°C), and DC cold resistance (22.45 Ohms), which were not specified for the original part.

Q: Why is the MDA-1/8-R classified as obsolete?

A: The MDA-1/8-R is no longer in active production by Eaton. The three Littelfuse 326 series equivalents are currently manufactured and available, providing continued supply for applications requiring this fuse specification.