Equivalent & Substitute Parts for MDA-3/4-R Ceramic Fuse

Part Overview

The MDA-3/4-R is a 750 mA, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for applications requiring circuit protection in 3AB and 3AG holder configurations with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The part maintains Active product status and is ROHS3 compliant with CE, CSA, and UL approvals. Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, ensuring functional interchangeability within the same circuit protection application.

Substiute Parts

MDA-3/4-R

Eaton - Electronics DivisionIn Stock: 817MDA-3/4-R Datasheet

Current PartRFQ

BK/MDA-3/4-R

Eaton - Electronics DivisionIn Stock: 1093BK/MDA-3/4-R Datasheet

DirectRFQ

0326.750VXP

Littelfuse Inc.In Stock: 10450326.750VXP Datasheet

DirectRFQ

GSA 750-R

Bel Fuse Inc.In Stock: 1503GSA 750-R Datasheet

SimilarRFQ

0326.750HXP

Littelfuse Inc.In Stock: 9860326.750HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MDA-3/4-R are classified based on alignment with the following critical parameters:

Direct Manufacturer Equivalent: BK/MDA-3/4-R matches all electrical and mechanical specifications of the main part, including current rating (750 mA), AC voltage rating (250 V), response time (Slow Blow), package configuration (3AB, 3AG), physical dimensions (0.250" Dia x 1.250" L), and approval certifications (CE, CSA, UL). This part is manufactured by the same supplier (Eaton - Electronics Division) and is functionally identical.

Direct Manufacturer Substitute: 0326.750VXP is manufactured by Littelfuse Inc. and shares the core electrical parameters: 750 mA current rating, 250 V AC voltage rating, Slow Blow response time, and identical package/case configuration (3AB, 3AG, 1/4" x 1-1/4"). This part adds DC voltage capability (125 V DC) and operates across an extended temperature range (-55°C ~ 125°C), providing enhanced performance characteristics while maintaining compatibility with the same holder systems.

Similar Manufacturer Substitute: GSA 750-R is manufactured by Bel Fuse Inc. and provides equivalent electrical performance with 750 mA current rating, 250 V AC voltage rating, Slow Blow response time, and matching package configuration (3AB, 3AG, 1/4" x 1-1/4"). Physical dimensions are nominally equivalent (0.250" Dia x 1.252" L), and approvals include CE, CSA, and cULus certification.

Parametric Equivalent: 0326.750HXP is manufactured by Littelfuse Inc. and provides parametric equivalence with 750 mA current rating, 250 V AC voltage rating, Slow Blow response time, and identical package/case configuration (3AB, 3AG, 1/4" x 1-1/4"). This part includes 125 V DC voltage rating and extended operating temperature range (-55°C ~ 125°C).

Parameter Comparison

Engineering Selection Recommendations

BK/MDA-3/4-R is the direct equivalent from Eaton - Electronics Division and is the primary substitute when sourcing from the same manufacturer is required. All electrical parameters, mechanical dimensions, and certifications are identical to the MDA-3/4-R. This part is suitable for direct replacement in existing designs without modification.

0326.750VXP and 0326.750HXP (Littelfuse Inc.) are suitable substitutes for applications requiring extended DC voltage capability (125 V DC) and broader operating temperature range (-55°C ~ 125°C). These parts maintain the same AC voltage rating (250 V), current rating (750 mA), response time (Slow Blow), and holder compatibility (3AB, 3AG). The higher breaking capacity (100A AC, 10kA DC) provides enhanced protection characteristics. These parts are appropriate for designs where DC operation or temperature extremes are operational requirements.

GSA 750-R (Bel Fuse Inc.) provides equivalent AC circuit protection with matching current rating (750 mA), voltage rating (250 V), response time (Slow Blow), and holder configuration (3AB, 3AG). Physical dimensions are nominally equivalent with cULus certification in addition to CE and CSA approvals. This part is suitable for applications where multi-source qualification is required.

All substitute parts maintain ROHS3 compliance and are classified as Active products. Selection should be based on specific application requirements regarding DC voltage operation, temperature extremes, and breaking capacity specifications.

Frequently Asked Questions (FAQ)

Q: Can BK/MDA-3/4-R be used as a direct replacement for MDA-3/4-R?

A: Yes. BK/MDA-3/4-R is manufactured by Eaton - Electronics Division and is electrically and mechanically identical to MDA-3/4-R. All parameters including current rating (750 mA), AC voltage rating (250 V), response time (Slow Blow), package configuration (3AB, 3AG), physical dimensions (0.250" Dia x 1.250" L), and certifications (CE, CSA, UL) are equivalent. This part is a direct equivalent.

Q: What is the difference between 0326.750VXP and 0326.750HXP?

A: Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications: 750 mA current rating, 250 V AC voltage rating, 125 V DC voltage rating, Slow Blow response time, and package configuration (3AB, 3AG, 1/4" x 1-1/4"). The primary difference is the melting I²t value: 0326.750VXP has a melting I²t of 7, while 0326.750HXP also has a melting I²t of 7. Both parts are parametrically equivalent and suitable for the same applications.

Q: Are the Littelfuse parts (0326.750VXP and 0326.750HXP) compatible with 3AB and 3AG holders?

A: Yes. Both Littelfuse parts are specified for 3AB and 3AG holder configurations with physical dimensions of 0.250" Dia x 1.250" L (6.35mm x 31.75mm), matching the holder compatibility of the MDA-3/4-R.

Q: What is the advantage of using GSA 750-R over MDA-3/4-R?

A: GSA 750-R provides equivalent AC circuit protection with the same current rating (750 mA), voltage rating (250 V), response time (Slow Blow), and holder compatibility (3AB, 3AG). GSA 750-R includes an extended operating temperature range (-55°C ~ 125°C) and cULus certification. Selection depends on whether these additional certifications or temperature range are required for the application.

Q: Can I use 0326.750VXP or 0326.750HXP in applications where only AC voltage is present?

A: Yes. Both Littelfuse parts are rated for 250 V AC operation and are suitable for AC-only applications. The 125 V DC rating provides additional capability but does not restrict use in AC circuits. The Slow Blow response time and 750 mA current rating remain consistent with the original MDA-3/4-R specification.

Q: What certifications do all substitute parts carry?

A: All substitute parts carry CE, CSA, and UL certifications (GSA 750-R carries cULus in addition to CE and CSA). All parts are ROHS3 compliant. These certifications ensure compliance with international safety and environmental standards.

Q: Are there any dimensional differences between substitute parts?

A: GSA 750-R has a nominal length of 1.252" (31.80mm) compared to 1.250" (31.75mm) for other parts. This 0.002" difference is within typical manufacturing tolerances for 3AB and 3AG holder compatibility. All parts maintain the same 0.250" diameter (6.35mm).