Equivalent & Substitute Parts for BK/MDQ-1/2

Part Overview

The BK/MDQ-1/2 is a 500 mA, 250 V AC/DC slow-blow glass fuse cartridge manufactured by Eaton - Electronics Division. This component is designed for use in 3AB and 3AG fuse holders with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The part maintains active product status and carries CSA and UL approvals.

Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity. Alternative components listed in this reference maintain identical or compatible electrical and mechanical specifications, enabling direct substitution within the same application circuit.

Substiute Parts

BK/MDQ-1/2

Eaton - Electronics DivisionIn Stock: 869BK/MDQ-1/2 Datasheet

Current PartRFQ

BK/MDL-1/2-R

Eaton - Electronics DivisionIn Stock: 1229BK/MDL-1/2-R Datasheet

Parametric EquivalentRFQ

MDL-1/2-R

Eaton - Electronics DivisionIn Stock: 1121MDL-1/2-R Datasheet

Parametric EquivalentRFQ

0313.500HXIDP

Littelfuse Inc.In Stock: 8530313.500HXIDP Datasheet

Parametric EquivalentRFQ

0313.500HXP

Littelfuse Inc.In Stock: 23640313.500HXP Datasheet

Parametric EquivalentRFQ

0313.500MXP

Littelfuse Inc.In Stock: 49370313.500MXP Datasheet

Parametric EquivalentRFQ

0313.500VXP

Littelfuse Inc.In Stock: 10450313.500VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDQ-1/2 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 500 mA
• Voltage Rating (AC): 250 V
• Response Time: Slow Blow
• Fuse Type: Cartridge, Glass
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Breaking Capacity @ Rated Voltage: 35A
• Mounting Type: Requires Holder
• Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)

All substitute parts listed below satisfy these mandatory parameters and are therefore electrically and mechanically interchangeable with the BK/MDQ-1/2 in applications requiring a 500 mA, 250 V AC/DC slow-blow glass fuse cartridge for 3AB/3AG holders.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain active product status and carry CSA and UL approvals, ensuring compliance with standard safety certifications. The following considerations apply to component selection:

Eaton MDL Series (BK/MDL-1/2-R and MDL-1/2-R): These parts are manufactured by the same supplier as the primary component and offer enhanced compliance certifications including CE marking. Both variants are RoHS compliant, addressing environmental regulatory requirements. The MDL series exhibits lower DC cold resistance (0.943 Ohms) compared to the BK/MDQ-1/2 (1.4 Ohms), which may be advantageous in applications sensitive to resistive heating.

Littelfuse 313 Series (0313.500HXIDP, 0313.500HXP, 0313.500MXP, 0313.500VXP): These components are manufactured by Littelfuse Inc. and carry CE, CSA, and UL approvals. All variants are ROHS3 compliant and rated for operating temperatures from -55°C to 125°C. The 313 series maintains DC cold resistance of 1.26 Ohms, positioning it between the BK/MDQ-1/2 and MDL variants. These parts are suitable for applications requiring extended temperature performance.

All substitute parts are mechanically and electrically compatible with the BK/MDQ-1/2 and require no modifications to existing fuse holder installations.

Frequently Asked Questions (FAQ)

Q: Can the BK/MDL-1/2-R be used as a direct replacement for the BK/MDQ-1/2?

A: Yes. Both components share identical electrical ratings (500 mA, 250 V AC/DC, slow-blow response), breaking capacity (35A), and mechanical dimensions (0.250" Dia x 1.250" L). Both are approved by CSA and UL. The BK/MDL-1/2-R additionally carries CE certification and is RoHS compliant.

Q: What is the difference between the Littelfuse 313 series variants (0313.500HXIDP, 0313.500HXP, 0313.500MXP, 0313.500VXP)?

A: All four Littelfuse 313 series variants are electrically and mechanically identical. They share the same current rating (500 mA), voltage rating (250 V AC), response time (slow-blow), breaking capacity (35A), and physical dimensions. The part number suffixes (HXIDP, HXP, MXP, VXP) indicate different packaging or distribution configurations but do not affect functional performance.

Q: Are there any compatibility concerns when substituting between Eaton and Littelfuse components?

A: No. All substitute parts maintain identical package specifications (3AB, 3AG, 1/4" x 1-1/4") and are designed for the same fuse holder types. Electrical parameters including current rating, voltage rating, and breaking capacity are equivalent across all listed components.

Q: Does the DC cold resistance difference between parts affect circuit performance?

A: DC cold resistance values vary slightly across the component range (0.943 Ohms to 1.4 Ohms). These differences are within acceptable tolerances for fuse cartridge applications and do not impact fuse holder compatibility or circuit protection function. Selection based on resistance should only occur if the application circuit has specific resistive heating requirements.

Q: Which substitute part offers the broadest environmental compliance?

A: The Littelfuse 313 series components (0313.500HXIDP, 0313.500HXP, 0313.500MXP, 0313.500VXP) provide ROHS3 compliance, CE certification, and operating temperature range of -55°C to 125°C. The Eaton MDL series (BK/MDL-1/2-R and MDL-1/2-R) also provide RoHS compliance and CE certification. Selection should be based on specific application environmental requirements.

Q: Can these fuse cartridges be used in both AC and DC circuits?

A: Yes. All components listed are rated for 250 V AC/DC operation, indicating compatibility with both alternating and direct current applications at the specified voltage level.