MDA-1-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The MDA-1-R is a 1 A, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for applications requiring overcurrent 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 with 1132 pieces in current inventory.

Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and holder compatibility are maintained across different manufacturers. Alternative sources provide design flexibility, supply chain redundancy, and extended availability options for production and maintenance applications.

Substiute Parts

MDA-1-R

Eaton - Electronics DivisionIn Stock: 1233MDA-1-R Datasheet

Current PartRFQ

BK/MDA-1-R

Eaton - Electronics DivisionIn Stock: 1727BK/MDA-1-R Datasheet

DirectRFQ

0001.2524

SCHURTER Inc.In Stock: 10980001.2524 Datasheet

DirectRFQ

0326001.HXP

Littelfuse Inc.In Stock: 10790326001.HXP Datasheet

DirectRFQ

0326001.MXP

Littelfuse Inc.In Stock: 12600326001.MXP Datasheet

DirectRFQ

0326001.VXP

Littelfuse Inc.In Stock: 10010326001.VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MDA-1-R are classified based on strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

• Current Rating: 1 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Physical Dimensions: 0.250" Dia x 1.250" L (exact match required)

Grouping Logic:

Group 1 - Direct Ceramic Equivalents (Eaton & Littelfuse): Parts BK/MDA-1-R, 0326001.HXP, 0326001.MXP, and 0326001.VXP maintain identical current, AC voltage, fuse type (ceramic), response time, and package specifications. These parts are interchangeable within the same holder configuration.

Group 2 - Glass Fuse Alternative (SCHURTER): Part 0001.2524 shares identical current rating, AC voltage, response time, and physical dimensions. This part differs in fuse material (glass vs. ceramic) and includes DC voltage rating specification (63 V DC). Glass fuse construction provides alternative material properties while maintaining mechanical and primary electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

BK/MDA-1-R (Eaton - Electronics Division): This part is the direct manufacturer equivalent to MDA-1-R, produced by the same manufacturer with identical electrical and mechanical specifications. Both parts maintain active product status and carry CE, CSA, and UL certifications. Selection of BK/MDA-1-R provides continuity with the original design while offering increased inventory availability (1709 pieces vs. 1132 pieces).

0326001.HXP, 0326001.MXP, 0326001.VXP (Littelfuse Inc. Series 326): These three Littelfuse ceramic cartridge fuses share identical current, AC voltage, fuse type, response time, and physical dimensions with the MDA-1-R. All three maintain active product status with CE, CSA, PSE, and UL certifications. The Littelfuse parts provide enhanced breaking capacity specifications (100 A AC vs. 35 A) and extended operating temperature range (-55°C to 125°C). These parts are suitable for applications requiring higher performance margins or broader temperature operation. The three variants differ only in packaging designation (HXP, MXP, VXP) and represent equivalent electrical performance.

0001.2524 (SCHURTER Inc. SPT 6.3x32): This glass cartridge fuse maintains identical current rating, AC voltage, response time, and physical dimensions. The part carries cURus certification and operates across -40°C to 85°C. This part is classified as obsolete and should be selected only when existing system designs specifically require glass fuse construction. The glass material provides different thermal and electrical characteristics compared to ceramic alternatives.

Compliance Considerations: All active substitute parts maintain ROHS3 compliance and REACH unaffected status. Littelfuse parts include PSE certification in addition to CE, CSA, and UL approvals, providing broader geographic compliance coverage.

Frequently Asked Questions (FAQ)

Q: Can BK/MDA-1-R be used as a direct replacement for MDA-1-R?

A: Yes. BK/MDA-1-R is produced by Eaton - Electronics Division with identical electrical ratings (1 A, 250 V AC), fuse type (ceramic), response time (slow blow), and physical dimensions (0.250" Dia x 1.250" L). Both parts are compatible with 3AB and 3AG holders and carry identical certifications (CE, CSA, UL).

Q: What are the differences between the Littelfuse 0326001 variants (HXP, MXP, VXP)?

A: The three Littelfuse parts (0326001.HXP, 0326001.MXP, 0326001.VXP) are electrically and mechanically identical. They differ only in packaging designation codes. All three share identical current rating (1 A), AC voltage (250 V), ceramic construction, slow-blow response, and physical dimensions. Selection among these three variants depends on packaging and procurement requirements rather than electrical performance.

Q: Can the SCHURTER 0001.2524 glass fuse replace the ceramic MDA-1-R?

A: The SCHURTER 0001.2524 maintains mechanical compatibility (same dimensions, same holder type) and identical current and AC voltage ratings. However, this part uses glass construction instead of ceramic and is classified as obsolete. Selection should be limited to applications where glass fuse material properties are specifically required or where existing designs mandate glass construction. The part carries cURus certification rather than the CE, CSA, UL combination of the MDA-1-R.

Q: What is the significance of the higher breaking capacity in Littelfuse parts?

A: Littelfuse 0326001 series parts specify 100 A AC breaking capacity compared to 35 A for the MDA-1-R. Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Higher breaking capacity provides greater safety margin in applications with higher available fault currents. This specification difference does not affect normal operation at the 1 A rated current but indicates enhanced performance capability under fault conditions.

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

A: Yes. All substitute parts listed maintain the 3AB and 3AG holder compatibility and identical physical dimensions (0.250" Dia x 1.250" L, with SCHURTER at 0.250" Dia x 1.252" L representing negligible dimensional variance). All parts are cartridge-type fuses requiring holder installation and are mechanically interchangeable within the same holder configuration.

Q: What certifications should I verify for my application?

A: The MDA-1-R carries CE, CSA, and UL certifications. Littelfuse substitutes (0326001 series) carry CE, CSA, PSE, and UL certifications, providing additional PSE approval for certain markets. The SCHURTER 0001.2524 carries cURus certification. Verify that the selected part's certification set meets your application's geographic and regulatory requirements.

Q: Why is the SCHURTER part listed as obsolete?

A: Product status reflects manufacturer availability and production status. The SCHURTER 0001.2524 is classified as obsolete, indicating discontinued production. This part should be selected only when existing designs specifically require glass fuse construction or when legacy system compatibility is mandatory. For new designs, active-status alternatives are recommended.

Q: What is the difference between melting I²t values across the parts?

A: Melting I²t represents the thermal energy required to melt the fuse element. The MDA-1-R specifies 0.9, while Littelfuse parts specify 16.3 and SCHURTER specifies 2.4. These differences reflect different fuse element designs and materials. Higher I²t values indicate slower thermal response. All parts maintain identical 1 A current rating and slow-blow response classification, with I²t differences representing design variations within the slow-blow category.