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

Part Overview

The BK/MDA-1/8-R is a 125 mA, 250 V AC/DC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 3AB and 3AG holders with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm) and features slow-blow response characteristics. The product is currently classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and component replacement in applications requiring this specific electrical and mechanical configuration.

Substiute Parts

BK/MDA-1/8-R

Eaton - Electronics DivisionIn Stock: 964BK/MDA-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 BK/MDA-1/8-R is determined by strict equivalence across the following critical 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)
• Mounting Type: Requires Holder (exact match required)
• Physical Dimensions: 0.250" Dia x 1.250" L / 6.35mm x 31.75mm (exact match required)

Compliance Parameters:

• RoHS Status: ROHS3 Compliant (exact match required)

All three substitute parts listed—0326.125HXP, 0326.125MXP, and 0326.125VXP—meet these criteria and are manufactured by Littelfuse Inc. as active product line alternatives.

Parameter Comparison

Engineering Selection Recommendations

The BK/MDA-1/8-R is obsolete and no longer in active production. Direct replacement with any of the three Littelfuse 326 series alternatives—0326.125HXP, 0326.125MXP, or 0326.125VXP—is electrically and mechanically equivalent based on all specified parameters.

Selection Basis:

All three substitute parts are active products with current manufacturing status, ensuring long-term availability and supply chain continuity. Each substitute maintains identical electrical specifications (125 mA, 250 V AC/DC, slow-blow response) and mechanical compatibility (3AB/3AG holders, 1/4" x 1-1/4" form factor).

The Littelfuse substitutes provide additional documented specifications not available for the original part, including 100A breaking capacity, CE approval certification, and defined operating temperature range (-55°C to 125°C). These characteristics confirm suitability for the same application environments as the original BK/MDA-1/8-R.

All substitute parts maintain ROHS3 compliance, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0326.125HXP, 0326.125MXP, and 0326.125VXP be used interchangeably with the BK/MDA-1/8-R?

A: Yes. All three Littelfuse parts are direct electrical and mechanical equivalents. They share identical current rating (125 mA), voltage rating (250 V AC), response time (slow blow), fuse type (ceramic cartridge), and physical dimensions (0.250" Dia x 1.250" L). They are compatible with the same 3AB and 3AG holders.

Q: What is the difference between the three Littelfuse substitute parts?

A: The three Littelfuse parts (0326.125HXP, 0326.125MXP, 0326.125VXP) are electrically and mechanically identical. The designation suffix (H, M, V) indicates internal construction or packaging variants within the Littelfuse 326 series, but all three meet the same electrical and mechanical specifications required for substitution.

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

A: The BK/MDA-1/8-R is no longer manufactured by Eaton - Electronics Division. The Littelfuse 326 series alternatives provide equivalent functionality and are currently in active production.

Q: Are the substitute parts compatible with existing 3AB and 3AG fuse holders?

A: Yes. The substitute parts maintain the same physical dimensions (0.250" Dia x 1.250" L) and package designation (3AB, 3AG) as the original BK/MDA-1/8-R, ensuring direct compatibility with existing holder hardware.

Q: Do the Littelfuse substitutes meet the same compliance standards?

A: Yes. All three Littelfuse substitute parts are ROHS3 compliant, matching the compliance status of the original part. Additionally, the Littelfuse parts carry CE approval certification.

Q: What is the operating temperature range for the substitute parts?

A: The Littelfuse 0326.125HXP, 0326.125MXP, and 0326.125VXP are rated for operation from -55°C to 125°C.