BK/MDA-V-12-R Equivalent & Substitute Parts

Part Overview

The BK/MDA-V-12-R is a 12 A, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This through-hole mounted fuse is designed for general-purpose circuit protection applications requiring slow-blow response characteristics. The part is currently active in production with 993 pieces in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges. The primary consideration for substitution involves matching the current rating, voltage rating, package dimensions, and response time characteristics while maintaining compliance with applicable approval agencies.

Substiute Parts

BK/MDA-V-12-R

Eaton - Electronics DivisionIn Stock: 1042BK/MDA-V-12-R Datasheet

Current PartRFQ

0325.500HXP

Littelfuse Inc.In Stock: 12240325.500HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution analysis for the BK/MDA-V-12-R is based on the following critical parameters:

Current Rating Compatibility: The main part operates at 12 A. Substitute parts must maintain the same current rating to ensure equivalent circuit protection performance.

Voltage Rating Compatibility: The main part is rated for 250 V AC. Substitute parts must support at least 250 V AC to maintain voltage margin and safety compliance.

Package and Mechanical Compatibility: Both the main part and substitute parts must use the 3AB, 3AG form factor with 1/4" x 1-1/4" (Axial) dimensions to ensure direct mechanical fit in existing circuit board layouts and fuse holders.

Response Time Characteristics: The main part features slow-blow response. Substitute parts must maintain identical response time classification to preserve circuit protection behavior during transient conditions.

Mounting Configuration: Through-hole mounting is required for both main and substitute parts to maintain installation compatibility.

Regulatory Compliance: All parts must carry CE, CSA, and UL approvals and maintain ROHS3 compliance to satisfy regulatory requirements.

The substitute part identified (0325.500HXP) does not meet the current rating requirement of 12 A and therefore cannot serve as a direct functional equivalent for this application.

Parameter Comparison

Engineering Selection Recommendations

The BK/MDA-V-12-R is an active product with full regulatory compliance (CE, CSA, UL) and ROHS3 certification. The part maintains adequate inventory levels (993 pieces in stock) for standard procurement cycles.

The substitute part 0325.500HXP, manufactured by Littelfuse Inc., does not qualify as a functional equivalent due to a significant current rating mismatch (500 mA versus 12 A). This difference represents a 24:1 reduction in current capacity and would result in inadequate circuit protection for applications designed for 12 A operation.

For applications requiring the BK/MDA-V-12-R specifications, the main part should be selected. No equivalent substitute part is available based on the provided parameter set.

Frequently Asked Questions (FAQ)

Q: Can the 0325.500HXP substitute for the BK/MDA-V-12-R?

A: No. The 0325.500HXP is rated for 500 mA, while the BK/MDA-V-12-R is rated for 12 A. The current rating difference makes this substitution incompatible for circuits designed for 12 A protection.

Q: What parameters must match for a valid fuse substitution?

A: Current rating, AC voltage rating, fuse type (cartridge ceramic), package dimensions (3AB, 3AG, 1/4" x 1-1/4"), response time (slow blow), and mounting type (through hole) must all match or exceed the original part specifications.

Q: Are the physical dimensions of these fuses identical?

A: The dimensions are comparable but not identical. The BK/MDA-V-12-R measures 0.266" Dia x 1.292" L, while the 0325.500HXP measures 0.275" Dia x 1.288" L. Both conform to the 3AB, 3AG standard form factor and fit standard fuse holders.

Q: Do both parts carry the same regulatory approvals?

A: Yes. Both the BK/MDA-V-12-R and 0325.500HXP carry CE, CSA, and UL approvals and are ROHS3 compliant.

Q: What is the significance of the melting I²t value difference?

A: The melting I²t value (125.18 for BK/MDA-V-12-R versus 2.5 for 0325.500HXP) reflects the thermal energy required to melt the fuse element. This difference is consistent with the 24:1 current rating difference and confirms these parts are designed for different circuit protection applications.

Q: Can I use a higher current-rated fuse in place of the 12 A BK/MDA-V-12-R?

A: No. Using a higher current-rated fuse would compromise circuit protection by allowing excessive current to flow before the fuse opens, potentially causing equipment damage or safety hazards.