Equivalent & Substitute Parts for BK/MDL-7-1/2

Part Overview

The BK/MDL-7-1/2 is a 7.5 A, 250 V AC/DC glass cartridge fuse with slow-blow response characteristics, designed for 3AB and 3AG holder compatibility. This fuse operates at dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm) and requires an external fuse holder for installation.

The main part number BK/MDL-7-1/2 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure continued availability and compliance with current regulatory standards, particularly regarding RoHS requirements and product lifecycle management.

Substiute Parts

BK/MDL-7-1/2

Eaton - Electronics DivisionIn Stock: 981BK/MDL-7-1/2 Datasheet

Current PartRFQ

BK/MDL-7-1/2-R

Eaton - Electronics DivisionIn Stock: 1207BK/MDL-7-1/2-R Datasheet

DirectRFQ

MDL-7-1/2-R

Eaton - Electronics DivisionIn Stock: 1106MDL-7-1/2-R Datasheet

DirectRFQ

MDQ-7-1/2

Eaton - Electronics DivisionIn Stock: 1029MDQ-7-1/2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDL-7-1/2 is determined by strict equivalence across the following parameters:

• Current Rating: 7.5 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Physical Dimensions: 0.250" Dia x 1.250" L (exact match required)
• Mounting Configuration: Requires Holder (exact match required)

All substitute parts listed below meet these criteria. Substitutes are grouped into two categories: direct manufacturer equivalents (same series designation) and parametric equivalents (different series designation but identical electrical and mechanical specifications).

Parameter Comparison

Engineering Selection Recommendations

For RoHS Compliance Requirements:

BK/MDL-7-1/2-R and MDL-7-1/2-R are the preferred substitutes when RoHS compliance is mandated. BK/MDL-7-1/2-R carries ROHS3 Compliant status with REACH Unaffected designation, while MDL-7-1/2-R carries RoHS Compliant status. Both are active products with current manufacturing support.

For Enhanced Approval Documentation:

MDQ-7-1/2 is the appropriate selection when CSA and UL approval certifications are required for the application. This part carries a Breaking Capacity rating of 35A at rated voltage and maintains active product status.

For Direct Series Continuity:

MDL-7-1/2-R maintains the same MDL series designation as the original part, providing direct lineage within the Eaton product family while offering active product status and RoHS compliance.

For Packaging Considerations:

All substitute parts are available in bulk packaging. BK/MDL-7-1/2-R and MDL-7-1/2-R both maintain inventory levels exceeding 1000 pieces. MDQ-7-1/2 maintains inventory of 1018 pieces.

Frequently Asked Questions (FAQ)

Q: Can MDQ-7-1/2 be used as a direct replacement for BK/MDL-7-1/2?

A: Yes. MDQ-7-1/2 meets all electrical and mechanical parameter requirements: 7.5 A current rating, 250 V AC voltage rating, slow-blow response, cartridge glass fuse type, and 3AB/3AG holder compatibility with identical physical dimensions. The MDQ series designation indicates a different product line, but parametric equivalence is complete.

Q: What is the difference between BK/MDL-7-1/2-R and MDL-7-1/2-R?

A: Both parts are electrically and mechanically identical. BK/MDL-7-1/2-R includes the "BK" prefix designation, while MDL-7-1/2-R uses the base series designation. Both are active products with RoHS compliance. The "R" suffix indicates a revised or current production version of the original MDL-7-1/2 design.

Q: Why is the original BK/MDL-7-1/2 marked as obsolete?

A: Product obsolescence reflects end-of-life status in the manufacturer's product portfolio. The substitute parts listed provide equivalent functionality with current manufacturing support and updated compliance certifications, particularly RoHS compliance.

Q: Are all substitute parts compatible with existing 3AB and 3AG fuse holders?

A: Yes. All substitute parts maintain the 3AB and 3AG holder compatibility specification and identical physical dimensions of 0.250" diameter by 1.250" length. No holder modifications or upgrades are required for installation.

Q: Does MDQ-7-1/2 offer any performance advantages over the MDL series substitutes?

A: MDQ-7-1/2 specifies a Breaking Capacity of 35A at rated voltage and carries CSA and UL approval certifications. These specifications are not provided for the MDL-7-1/2-R variants. Selection should be based on application requirements for breaking capacity and required approval standards.

Q: What is the Moisture Sensitivity Level (MSL) for these fuses?

A: BK/MDL-7-1/2-R specifies MSL 1 (Unlimited), indicating no moisture sensitivity constraints. MDL-7-1/2-R and MDQ-7-1/2 specify MSL as Not Applicable, consistent with cartridge fuse construction.