Equivalent & Substitute Parts for MDQ-9 Glass Cartridge Fuse

Part Overview

The MDQ-9 is a 9 A, 32 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 3AB and 3AG holders with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The product is currently active and maintains 663 pieces in new original stock. Substitute parts are identified to provide alternative sourcing options when the primary part becomes unavailable or when inventory requirements necessitate alternative manufacturer selections.

Substiute Parts

MDQ-9

Eaton - Electronics DivisionIn Stock: 730MDQ-9 Datasheet

Current PartRFQ

BK/MDL-9-R

Eaton - Electronics DivisionIn Stock: 922BK/MDL-9-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MDQ-9 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Current Rating: 9 A (exact match required)
• Voltage Rating (AC): 32 V (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)
• Breaking Capacity @ Rated Voltage: 1 kA (exact match required)
• Size / Dimension: 0.250" Dia x 1.250" L (exact match required)

The BK/MDL-9-R meets all critical matching parameters and is classified as a parametric equivalent. Both parts are manufactured by Eaton - Electronics Division and share identical electrical and mechanical specifications within the allowed tolerance parameters for this product category.

Parameter Comparison

Engineering Selection Recommendations

Both the MDQ-9 and BK/MDL-9-R are active products manufactured by Eaton - Electronics Division with identical electrical and mechanical specifications. The BK/MDL-9-R carries additional CE approval certification in addition to CSA and UL approvals held by the MDQ-9. Selection between these parts should be based on inventory availability, supply chain requirements, and regional compliance certifications needed for the end application. Both parts are suitable for direct substitution in applications requiring a 9 A, 32 V AC/DC slow-blow glass cartridge fuse in 3AB/3AG holders.

Frequently Asked Questions (FAQ)

Q: Can the BK/MDL-9-R be used as a direct replacement for the MDQ-9?

A: Yes. Both parts share identical current rating (9 A), voltage rating (32 V AC), fuse type (cartridge, glass), response time (slow blow), package designation (3AB, 3AG), breaking capacity (1 kA), and physical dimensions (0.250" Dia x 1.250" L). Direct substitution is supported for applications requiring these specifications.

Q: What are the key differences between MDQ-9 and BK/MDL-9-R?

A: The primary differences are: (1) Series designation (MDQ versus MDL), (2) DC Cold Resistance (0.00888 Ohms versus 0.012 Ohms), (3) Approval certifications (MDQ-9 holds CSA and UL; BK/MDL-9-R holds CE, CSA, and UL), and (4) Inventory levels (663 pieces versus 823 pieces). Electrical and mechanical performance parameters are identical.

Q: Are both parts compatible with 3AB and 3AG holders?

A: Yes. Both the MDQ-9 and BK/MDL-9-R are specified for use in 3AB and 3AG holders with matching physical dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm).

Q: Which part should be selected for applications requiring CE certification?

A: The BK/MDL-9-R carries CE approval certification in addition to CSA and UL approvals. For applications requiring CE compliance, the BK/MDL-9-R is the appropriate selection.

Q: Do these fuses require a holder for installation?

A: Yes. Both the MDQ-9 and BK/MDL-9-R are cartridge-type fuses that require a compatible holder (3AB or 3AG) for installation and operation.