Equivalent & Substitute Parts for MDA-12-R Ceramic Fuse

Part Overview

The MDA-12-R is a 12 A, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for applications requiring 3AB and 3AG holder compatibility with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The part is active in production status with 924 pieces currently in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, application-specific voltage ratings, or regional compliance certifications.

Substiute Parts

MDA-12-R

Eaton - Electronics DivisionIn Stock: 958MDA-12-R Datasheet

Current PartRFQ

BK/MDA-12-R

Eaton - Electronics DivisionIn Stock: 5121BK/MDA-12-R Datasheet

Parametric EquivalentRFQ

0326012.HXP

Littelfuse Inc.In Stock: 17380326012.HXP Datasheet

Parametric EquivalentRFQ

0326012.MXDP

Littelfuse Inc.In Stock: 23350326012.MXDP Datasheet

Parametric EquivalentRFQ

0326012.MXP

Littelfuse Inc.In Stock: 240040326012.MXP Datasheet

Parametric EquivalentRFQ

0326012.VXP

Littelfuse Inc.In Stock: 9320326012.VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MDA-12-R are classified based on strict electrical and mechanical compatibility criteria. All substitute parts maintain the following core parameters identical to the main part:

• Current Rating: 12 A
• Voltage Rating - AC: 250 V
• Fuse Type: Cartridge, Ceramic
• Response Time: Slow Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Mounting Type: Requires Holder
• RoHS Status: ROHS3 Compliant

Substitutes are differentiated by DC voltage rating capability, DC cold resistance, melting I²t characteristics, and regional approval certifications. The Eaton BK/MDA-12-R variant maintains identical AC specifications with enhanced inventory availability. Littelfuse 326 series parts (0326012.HXP, 0326012.MXDP, 0326012.MXP, 0326012.VXP) provide extended DC voltage ratings and broader international certifications while maintaining AC parameter equivalence.

Parameter Comparison

Engineering Selection Recommendations

Eaton BK/MDA-12-R: Direct equivalent from the same manufacturer with identical AC electrical characteristics and mechanical form factor. Offers superior inventory availability (5039 units) compared to the primary MDA-12-R part. Includes CE certification in addition to CSA and UL approvals. DC cold resistance is marginally lower (0.00725 Ohms vs. 0.00755 Ohms), indicating minimal thermal performance variation. Recommended for applications requiring Eaton brand continuity and enhanced stock availability.

Littelfuse 0326012.HXP and 0326012.MXP: Functionally equivalent for AC applications with identical 12 A, 250 V AC ratings and 3AB/3AG package compatibility. Both parts extend DC voltage capability to 60 V and provide broader international certifications (K-MARK, PSE). The 0326012.MXP variant offers the highest inventory level (23902 units) among all substitutes. DC cold resistance (0.0067 Ohms) is lower than the primary part. Recommended for applications requiring extended DC voltage ratings or international compliance certifications.

Littelfuse 0326012.MXDP: Maintains AC equivalence with elevated melting I²t (445 vs. 125.18) and significantly reduced DC cold resistance (0.0011 Ohms). Suitable for applications requiring enhanced thermal characteristics and low-resistance performance. Limited inventory (2300 units). Certifications include CE, CSA, and UL.

Littelfuse 0326012.VXP: Provides the highest DC voltage rating (125 V) among all substitutes while maintaining 12 A, 250 V AC equivalence. Includes KC certification for Korean market compliance. Lowest inventory availability (901 units). Recommended for applications requiring maximum DC voltage capability and international market support.

Frequently Asked Questions (FAQ)

Q: Can BK/MDA-12-R be used as a direct replacement for MDA-12-R?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical specifications for AC applications (12 A, 250 V AC), response time (Slow Blow), and mechanical package (3AB, 3AG, 1/4" x 1-1/4"). The BK/MDA-12-R includes additional CE certification and offers higher inventory availability.

Q: What is the difference between Littelfuse 0326012.HXP and 0326012.MXP?

A: Both parts are electrically equivalent for AC applications (12 A, 250 V AC) and share identical package specifications. The primary difference is inventory availability: 0326012.MXP has 23902 units in stock compared to 1656 units for 0326012.HXP. Both provide 60 V DC capability and identical DC cold resistance (0.0067 Ohms).

Q: Are all substitute parts compatible with 3AB and 3AG holders?

A: Yes. All substitute parts listed maintain the identical package specification of 3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm) and require the same holder type as the primary MDA-12-R part.

Q: Which substitute part has the lowest DC cold resistance?

A: The Littelfuse 0326012.MXDP has the lowest DC cold resistance at 0.0011 Ohms, compared to 0.00755 Ohms for the primary MDA-12-R part. This characteristic may be relevant for applications sensitive to resistive heating.

Q: Can I use a substitute part with higher DC voltage rating in an AC-only application?

A: Yes. Parts with extended DC voltage ratings (60 V or 125 V) are fully compatible with AC-only applications. The AC electrical characteristics (12 A, 250 V AC, Slow Blow response) remain identical across all substitute parts.

Q: Which substitute offers the broadest international certifications?

A: The Littelfuse 0326012.HXP and 0326012.MXP both include CE, CSA, K-MARK, PSE, and UL certifications, providing the widest regional compliance coverage among all substitute options.

Q: What is the significance of melting I²t differences between parts?

A: Melting I²t is a thermal characteristic that affects fuse response behavior. The primary MDA-12-R has a melting I²t of 125.18, while Littelfuse substitutes range from 129 to 445. These variations indicate different thermal response profiles; however, all parts maintain identical Slow Blow response classification and 12 A current rating.