BK/MDA-V-1/4-R Ceramic Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The BK/MDA-V-1/4-R is a 250 mA, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for through-hole mounting in 3AB, 3AG form factor (1/4" x 1-1/4" axial). The part is currently active in production with 920 pieces in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring 250 mA protection at 250 V AC.

Substiute Parts

BK/MDA-V-1/4-R

Eaton - Electronics DivisionIn Stock: 938BK/MDA-V-1/4-R Datasheet

Current PartRFQ

0325.250HXP

Littelfuse Inc.In Stock: 9030325.250HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDA-V-1/4-R is determined by the following critical parameters:

Primary Matching Criteria:

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

Secondary Compatibility Factors:

• Approval Agencies: CE, CSA, UL certification required
• RoHS Status: ROHS3 Compliant required

The substitute part 0325.250HXP (Littelfuse Inc., Series 325) meets all primary matching criteria and secondary compatibility requirements, qualifying it as a direct substitute for the BK/MDA-V-1/4-R in applications requiring 250 mA protection at 250 V AC with slow-blow response characteristics.

Parameter Comparison

Engineering Selection Recommendations

BK/MDA-V-1/4-R (Eaton - Electronics Division):

• Primary choice for applications requiring Eaton MDA series fuses
• Active product status with established supply chain
• 920 pieces currently in stock
• Meets CE, CSA, and UL certification requirements
• ROHS3 compliant for regulated markets

0325.250HXP (Littelfuse Inc., Series 325):

• Direct substitute for 250 mA, 250 V AC slow-blow ceramic cartridge fuse applications
• Active product status with 808 pieces in stock
• Meets CE, CSA, and UL certification requirements
• ROHS3 compliant for regulated markets
• Provides additional DC voltage rating (125 V) not specified in main part
• Higher breaking capacity (100A AC, 10kA DC) compared to main part (35A)
• Lower DC cold resistance (4.43 Ohms vs. 9.1 Ohms)
• Higher melting I²t value (0.432 vs. 0.28)
• Specified operating temperature range (-55°C ~ 125°C)

Both parts are suitable for direct substitution in 250 mA, 250 V AC applications requiring slow-blow ceramic cartridge fuses in 3AB, 3AG form factor. Selection between the two should be based on manufacturer preference, supply availability, and specific application requirements regarding breaking capacity and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 0325.250HXP substitute for the BK/MDA-V-1/4-R in all applications?

A: The 0325.250HXP is a direct substitute for applications requiring 250 mA protection at 250 V AC with slow-blow response in 3AB, 3AG form factor. Both parts meet identical primary electrical and mechanical specifications. The substitute provides higher breaking capacity and additional DC voltage rating, which are compatible with applications designed for the main part.

Q: What is the significance of the different melting I²t values (0.28 vs. 0.432)?

A: The melting I²t value indicates the thermal energy required to melt the fuse element. The 0325.250HXP has a higher melting I²t, meaning it requires more thermal energy to operate. This difference should be evaluated against specific circuit protection requirements and inrush current characteristics of the application.

Q: Why does the 0325.250HXP have a DC voltage rating when the BK/MDA-V-1/4-R does not specify one?

A: The BK/MDA-V-1/4-R datasheet does not specify a DC voltage rating, while the 0325.250HXP specifies 125 V DC. This additional specification in the substitute part does not prevent substitution; it indicates the substitute is rated for both AC and DC applications. Applications using only AC voltage are unaffected by this difference.

Q: Are there any physical dimension differences between these parts?

A: Both parts use the 3AB, 3AG form factor (1/4" x 1-1/4" axial). Minor dimensional variations exist: BK/MDA-V-1/4-R is 0.266" Dia x 1.292" L (6.76mm x 32.82mm), while 0325.250HXP is 0.275" Dia x 1.288" L (6.99mm x 32.72mm). These variations are within standard tolerance for the 3AB, 3AG package and do not affect mechanical compatibility in standard fuse holders.

Q: Do both parts meet the same regulatory certifications?

A: Yes. Both the BK/MDA-V-1/4-R and 0325.250HXP carry CE, CSA, and UL approvals and are ROHS3 compliant. Both are classified under ECCN EAR99 and HTSUS 8536.10.0040.

Q: What is the difference in DC cold resistance between these parts?

A: The BK/MDA-V-1/4-R has 9.1 Ohms DC cold resistance, while the 0325.250HXP has 4.43 Ohms. Lower resistance in the substitute part results in less voltage drop across the fuse during normal operation, which may be beneficial in low-voltage circuits but should be evaluated against specific circuit design requirements.