Equivalent & Substitute Parts for BK/MDA-1/2-R

Part Overview

The BK/MDA-1/2-R is a 500 mA, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for applications requiring circuit protection in the 500 mA range at 250 V AC. The part is currently active in production with 844 pieces in stock. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements necessitate alternative electrical or mechanical characteristics within the allowed parameter range.

Substiute Parts

BK/MDA-1/2-R

Eaton - Electronics DivisionIn Stock: 891BK/MDA-1/2-R Datasheet

Current PartRFQ

0001.2521

SCHURTER Inc.In Stock: 20440001.2521 Datasheet

DirectRFQ

0326.500HXP

Littelfuse Inc.In Stock: 14090326.500HXP Datasheet

DirectRFQ

0326.500MXP

Littelfuse Inc.In Stock: 19400326.500MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/MDA-1/2-R are identified based on strict equivalence of the following critical parameters:

Primary Equivalence Criteria:

• Current Rating: 500 mA (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 Parameters:

• Size / Dimension: 0.250" Dia x 1.250" L or equivalent within tolerance
• RoHS Status: ROHS3 Compliant (compliance maintained)

The substitute parts listed below meet all primary equivalence criteria. Variations in fuse material (ceramic versus glass), DC voltage rating, breaking capacity, and operating temperature range are permitted where the AC voltage and current ratings remain unchanged.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed—0326.500MXP, 0326.500HXP, and 0001.2521—are functionally equivalent to the BK/MDA-1/2-R for applications requiring 500 mA, 250 V AC circuit protection in the 3AB/3AG cartridge format.

Littelfuse 0326.500MXP and 0326.500HXP: These ceramic cartridge fuses are direct functional equivalents with identical current, AC voltage, and package specifications. Both parts carry CE, CSA, and UL approvals matching the original part. The extended operating temperature range (-55°C ~ 125°C) and higher breaking capacity (100A AC, 10kA DC) provide enhanced performance margins in demanding applications. The melting I²t value of 2.5 is within 0.1 units of the original specification. These parts are suitable for direct substitution in all applications where the BK/MDA-1/2-R is specified.

SCHURTER 0001.2521: This glass cartridge fuse meets all primary equivalence criteria with identical current, AC voltage, and package specifications. The part carries cURus approval (combined UL and CSA certification). The glass construction differs from the ceramic material of the original part. The melting I²t value of 0.3 is significantly lower than the original 2.6, indicating faster response characteristics. This part is suitable for substitution in applications where glass fuse construction is acceptable and where the lower melting I²t does not conflict with circuit protection requirements.

All substitute parts are ROHS3 compliant and maintain regulatory compliance with the original specification.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0326.500MXP be used as a direct replacement for the BK/MDA-1/2-R?

A: Yes. The 0326.500MXP matches all critical parameters: 500 mA current rating, 250 V AC voltage rating, 3AB/3AG package format, slow-blow response time, and ceramic cartridge construction. Both parts carry identical regulatory approvals (CE, CSA, UL) and are ROHS3 compliant.

Q: What is the difference between the Littelfuse 0326.500MXP and 0326.500HXP?

A: Both parts are electrically and mechanically identical. They share the same current rating (500 mA), AC voltage rating (250 V), package format (3AB/3AG), ceramic construction, and regulatory approvals. The part numbers represent different manufacturing batches or inventory designations within the Littelfuse 326 series.

Q: Why does the SCHURTER 0001.2521 have a lower melting I²t value?

A: The SCHURTER part uses glass construction rather than ceramic. Glass fuses typically exhibit different thermal characteristics and response profiles compared to ceramic fuses. The melting I²t of 0.3 indicates faster thermal response. This part is suitable for substitution only in applications where the faster response time does not compromise circuit protection requirements.

Q: Are all substitute parts physically compatible with the same fuse holder?

A: Yes. All substitute parts conform to the 3AB/3AG package format with dimensions of 0.250" diameter by approximately 1.250" length. The SCHURTER part measures 0.250" Dia x 1.252" L, a difference of 0.002" in length that falls within standard mechanical tolerance for 3AB/3AG holders.

Q: Which substitute part has the highest breaking capacity?

A: The SCHURTER 0001.2521 has the highest breaking capacity at 1.5 kA AC and 20 kA DC. The Littelfuse parts (0326.500MXP and 0326.500HXP) provide 100 A AC and 10 kA DC breaking capacity. The original BK/MDA-1/2-R specifies 35 A breaking capacity.

Q: Do all substitute parts carry the same regulatory approvals as the original?

A: The Littelfuse parts (0326.500MXP and 0326.500HXP) carry identical approvals: CE, CSA, and UL. The SCHURTER 0001.2521 carries cURus approval, which represents combined UL and CSA certification. All parts are ROHS3 compliant.

Q: What is the operating temperature range for each part?

A: The BK/MDA-1/2-R does not specify an operating temperature range. The Littelfuse parts operate from -55°C to 125°C. The SCHURTER part operates from -40°C to 85°C. For applications with extreme temperature requirements, the Littelfuse parts provide a wider operating window.