Equivalent & Substitute Parts for BK/MDA-1-1/4-R

Part Overview

The BK/MDA-1-1/4-R is a 1.25 A, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for applications requiring holder-based installation in 3AB and 3AG form factors with dimensions of 1/4" x 1-1/4". The part maintains active product status with 931 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, design optimization, and supply chain continuity for applications where the primary part may be unavailable or where alternative electrical characteristics better suit specific circuit requirements.

Substiute Parts

BK/MDA-1-1/4-R

Eaton - Electronics DivisionIn Stock: 1009BK/MDA-1-1/4-R Datasheet

Current PartRFQ

03261.25HXP

Littelfuse Inc.In Stock: 127003261.25HXP Datasheet

DirectRFQ

0001.2525

SCHURTER Inc.In Stock: 12940001.2525 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Primary Matching Criteria:

• Current Rating: 1.25 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)

Secondary Compatibility Factors:

• Physical dimensions must accommodate existing holder installations
• RoHS3 compliance and REACH unaffected status ensure regulatory alignment
• Fuse type (ceramic or glass) may vary provided all primary criteria are met

The substitute parts listed below satisfy all primary matching criteria and maintain regulatory compliance. Variations in DC voltage rating, breaking capacity, melting I²t, and operating temperature ranges reflect manufacturer-specific design characteristics and do not preclude substitution in AC-primary applications.

Parameter Comparison

Engineering Selection Recommendations

03261.25HXP (Littelfuse Inc.): This ceramic cartridge fuse is a direct functional equivalent to the BK/MDA-1-1/4-R. Both parts share identical current rating, AC voltage rating, package configuration, and response time characteristics. The Littelfuse part provides additional DC voltage rating (125 V) and higher breaking capacity specifications (100 A AC, 10 kA DC). Approval certifications include CE, CSA, PSE, and UL, with an extended operating temperature range of -55°C to 125°C. This part is suitable for applications requiring enhanced DC performance or broader temperature operation. Current inventory of 1217 units supports immediate procurement.

0001.2525 (SCHURTER Inc.): This glass cartridge fuse meets all primary substitution criteria with matching current rating, AC voltage rating, package configuration, and response time. The primary distinction is the fuse element material (glass versus ceramic). The SCHURTER part provides DC voltage rating of 63 V and higher breaking capacity for DC applications (20 kA DC). Approval certifications include cURus with an operating temperature range of -40°C to 85°C. This part is suitable for applications where glass fuse construction is acceptable and DC voltage requirements do not exceed 63 V. Current inventory of 1278 units supports immediate procurement.

Both substitute parts maintain full regulatory compliance (ROHS3 and REACH unaffected status) and active product status, ensuring long-term availability and design continuity.

Frequently Asked Questions (FAQ)

Q: Can the 03261.25HXP substitute for the BK/MDA-1-1/4-R in all applications?

A: The 03261.25HXP meets all primary electrical and mechanical substitution criteria: 1.25 A current rating, 250 V AC voltage rating, slow-blow response, and 3AB/3AG package configuration. Both are ceramic cartridge fuses with identical physical dimensions. The Littelfuse part includes additional DC voltage rating (125 V) and higher breaking capacity, which do not preclude substitution in AC-primary circuits. Substitution is valid for applications matching the specified parameters.

Q: What is the difference between the ceramic fuse (03261.25HXP) and the glass fuse (0001.2525)?

A: Both parts share identical current rating (1.25 A), AC voltage rating (250 V), response time (slow blow), and package configuration (3AB, 3AG, 1/4" x 1-1/4"). The material difference (ceramic versus glass) reflects manufacturer design approach. The SCHURTER glass fuse provides 63 V DC rating and 20 kA DC breaking capacity, while the Littelfuse ceramic fuse provides 125 V DC rating and 10 kA DC breaking capacity. Selection depends on application DC voltage requirements and breaking capacity specifications.

Q: Are the physical dimensions identical across all three parts?

A: The BK/MDA-1-1/4-R and 03261.25HXP share identical dimensions of 0.250" Dia x 1.250" L (6.35mm x 31.75mm). The 0001.2525 has a length of 0.250" Dia x 1.252" L (6.35mm x 31.80mm), a difference of 0.002" (0.05mm). This minimal variation does not affect holder compatibility for standard 3AB and 3AG installations.

Q: Do all three parts meet current regulatory requirements?

A: All three parts are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic component procurement. The 03261.25HXP carries additional approvals (CE, CSA, PSE, UL), while the 0001.2525 carries cURus approval. All parts maintain active product status with current manufacturers.

Q: What is the significance of the melting I²t values?

A: Melting I²t represents the thermal energy required to melt the fuse element. The BK/MDA-1-1/4-R specifies 1.5, the 03261.25HXP specifies 24, and the 0001.2525 specifies 2.5. These values reflect manufacturer-specific design characteristics and element composition. All three parts are classified as slow-blow fuses and share identical current and voltage ratings, making them functionally equivalent for circuit protection applications.

Q: Can the 0001.2525 be used in DC applications?

A: The 0001.2525 is rated for 63 V DC with a breaking capacity of 20 kA DC. It is suitable for DC applications where the circuit voltage does not exceed 63 V. For applications requiring higher DC voltage capability, the 03261.25HXP (125 V DC rating) is the appropriate selection.