BK/FM09A-5AS Equivalent & Substitute Parts

Part Overview

The BK/FM09A-5AS is a government-specification fuse manufactured by Eaton - Bussmann Electrical Division. This component requires a dedicated fuse holder for installation and operates with unlimited moisture sensitivity tolerance (MSL 1). The part is currently classified as obsolete, making identification of suitable substitutes essential for ongoing maintenance and repair applications where this fuse type is specified.

Substiute Parts

BK/FM09A-5AS

Eaton - Bussmann Electrical DivisionIn Stock: 1203BK/FM09A-5AS Datasheet

Current PartRFQ

BK/F03A-5AS

Eaton - Bussmann Electrical DivisionIn Stock: 952BK/F03A-5AS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the BK/FM09A-5AS is determined by strict alignment of the following parameters:

• Package / Case designation: 3AB, 3AG, 1/4" x 1-1/4"
• Physical dimensions: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Mounting requirement: Requires Holder
• Tariff classification: HTSUS 8536.10.0040
• Export control: ECCN EAR99

The identified substitute BK/F03A-5AS meets all these criteria. Both parts share identical package specifications, physical dimensions, and mounting requirements, enabling direct substitution in applications where the BK/FM09A-5AS was originally specified.

Parameter Comparison

Engineering Selection Recommendations

The BK/F03A-5AS is the direct substitute for the BK/FM09A-5AS. Both components are manufactured by Eaton - Bussmann Electrical Division and share identical mechanical and electrical package specifications. The primary distinction is product status: the BK/FM09A-5AS is obsolete while the BK/F03A-5AS maintains active production status. The BK/F03A-5AS carries RoHS compliance certification, providing additional environmental compliance assurance for new designs and procurement cycles. Inventory availability of 866 pieces for the BK/F03A-5AS supports immediate deployment in replacement applications.

Frequently Asked Questions (FAQ)

Q: Can the BK/F03A-5AS be used as a direct replacement for the BK/FM09A-5AS?

A: Yes. Both parts share identical package designations (3AB, 3AG, 1/4" x 1-1/4"), physical dimensions (0.250" Dia x 1.250" L), and mounting requirements (Requires Holder). No mechanical or electrical modifications are required for substitution.

Q: Why is the BK/FM09A-5AS classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. The BK/F03A-5AS serves as the current-generation equivalent and is actively manufactured.

Q: What is the difference in RoHS compliance between these parts?

A: The BK/F03A-5AS is certified RoHS Compliant. RoHS compliance status is not specified for the BK/FM09A-5AS. For applications requiring RoHS certification, the BK/F03A-5AS is the appropriate selection.

Q: Are both parts compatible with the same fuse holders?

A: Yes. Both parts require a dedicated fuse holder and use identical 1/4" x 1-1/4" form factor specifications, ensuring compatibility with the same holder hardware.

Q: What export control classification applies to these fuses?

A: Both the BK/FM09A-5AS and BK/F03A-5AS are classified under ECCN EAR99, indicating they are not subject to export licensing requirements.