BK/MDA-V-1/2 Equivalent & Substitute Parts

Part Overview

The BK/MDA-V-1/2 is a 500 mA, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing maintenance and new design applications. The fuse features a slow-blow response characteristic and is housed in a 3AB, 3AG form factor with through-hole mounting. Locating functionally compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

BK/MDA-V-1/2

Eaton - Electronics DivisionIn Stock: 1124BK/MDA-V-1/2 Datasheet

Current PartRFQ

BK/MDA-V-1/2-R

Eaton - Electronics DivisionIn Stock: 972BK/MDA-V-1/2-R Datasheet

DirectRFQ

MDA-V-1/2-R

Eaton - Electronics DivisionIn Stock: 948MDA-V-1/2-R Datasheet

DirectRFQ

0325.500HXP

Littelfuse Inc.In Stock: 12240325.500HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/MDA-V-1/2 is determined by strict alignment of the following parameters:

Critical Matching Parameters:

• Current Rating: 500 mA
• Voltage Rating - AC: 250 V
• Fuse Type: Cartridge, Ceramic
• Response Time: Slow Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial)
• Mounting Type: Through Hole

Direct Substitutes (Eaton - Electronics Division):

• BK/MDA-V-1/2-R
• MDA-V-1/2-R

These parts are manufactured by the same supplier and maintain identical electrical and mechanical specifications. Both are classified as active products with current availability.

Similar Substitute (Cross-Manufacturer):

• 0325.500HXP (Littelfuse Inc.)

This part matches all critical parameters and is manufactured by an alternative supplier. It provides functional equivalence with enhanced specifications in certain areas.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Manufacturer):

BK/MDA-V-1/2-R and MDA-V-1/2-R are the primary substitutes for the obsolete BK/MDA-V-1/2. Both parts are active products with identical electrical and mechanical specifications. The Eaton parts carry CE, CSA, and UL certifications and are ROHS3 compliant, addressing regulatory requirements that the original part does not meet. These substitutes are recommended for applications requiring continuity with the original design intent.

For Cross-Manufacturer Substitution:

The 0325.500HXP (Littelfuse Inc.) provides functional equivalence with enhanced specifications. This part maintains all critical electrical parameters and mechanical form factor compatibility. The Littelfuse part offers a higher breaking capacity (100A AC, 10kA DC versus 35A), extended operating temperature range (-55°C to 125°C), and DC voltage rating (125 V). The 0325.500HXP is ROHS3 compliant and carries CE, CSA, and UL certifications. Selection of this part is appropriate when enhanced performance margins or extended temperature operation are required.

Compliance Considerations:

All substitute parts are ROHS3 compliant, whereas the original BK/MDA-V-1/2 is non-compliant. For applications subject to RoHS regulations, substitution is mandatory. All substitute parts carry CE certification in addition to CSA and UL approvals, providing broader regulatory coverage.

Frequently Asked Questions (FAQ)

Q: Can BK/MDA-V-1/2-R and MDA-V-1/2-R be used interchangeably with the original BK/MDA-V-1/2?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical ratings (500 mA, 250 V AC), fuse type (ceramic cartridge), response time (slow blow), and mechanical form factor (3AB, 3AG, 1/4" x 1-1/4" axial). The primary differences are product status (active versus obsolete) and regulatory compliance (ROHS3 compliant versus non-compliant).

Q: What are the key differences between the Eaton substitutes and the Littelfuse 0325.500HXP?

A: All three parts share identical current rating, AC voltage rating, fuse type, response time, and package form factor. The Littelfuse part differs in breaking capacity (100A AC, 10kA DC versus 35A), DC voltage rating (125 V specified), operating temperature range (-55°C to 125°C versus unspecified), and DC cold resistance (1.3 Ohms versus 1.925-2.6 Ohms). Melting I²t values also differ slightly (2.5 versus 2.3 or 1.2).

Q: Are there mechanical compatibility concerns when substituting with the 0325.500HXP?

A: The 0325.500HXP has a slightly larger diameter (0.275" versus 0.266") and marginally shorter length (1.288" versus 1.292"). These dimensional differences are within typical manufacturing tolerances for 3AB, 3AG form factor fuses and do not preclude mechanical compatibility in standard through-hole fuse holders.

Q: Which substitute part should be selected for new designs?

A: For new designs, either BK/MDA-V-1/2-R, MDA-V-1/2-R, or 0325.500HXP are appropriate. Selection depends on supply chain preference, manufacturer relationship, and performance requirements. All parts are active products with current availability and full regulatory certifications.

Q: Does the change in melting I²t value affect substitutability?

A: Melting I²t is a thermal characteristic that influences fuse response time under fault conditions. The BK/MDA-V-1/2 has a melting I²t of 2.3, while BK/MDA-V-1/2-R and MDA-V-1/2-R have 1.2, and 0325.500HXP has 2.5. All parts maintain the same slow-blow response classification. Substitution is valid within the same response time category and current/voltage ratings.

Q: What is the significance of the DC cold resistance differences?

A: DC cold resistance affects voltage drop during normal operation. The original part has 1.925 Ohms, Eaton substitutes have 2.6 Ohms, and the Littelfuse part has 1.3 Ohms. These variations are within acceptable ranges for ceramic cartridge fuses and do not affect substitutability for the specified 500 mA, 250 V AC application.

Q: Are all substitute parts RoHS compliant?

A: Yes. BK/MDA-V-1/2-R, MDA-V-1/2-R, and 0325.500HXP are all ROHS3 compliant. The original BK/MDA-V-1/2 is RoHS non-compliant. For applications subject to RoHS regulations, substitution with any of the listed parts is required.