BK/HMF Fuse Holder Cartridge 32V 20A In-Line

Part Overview

The BK/HMF is an in-line cartridge fuse holder manufactured by Eaton - Electronics Division, rated for 20 A at 32V. This component is designed for single-circuit applications using 0.25" diameter by 0.625" length cartridge fuses (1AG format). The product is currently active and maintains an inventory of 1130 pieces in new original condition. The BK/HMF is RoHS Compliant and carries Moisture Sensitivity Level 1 (unlimited shelf life), making it suitable for general industrial and commercial applications requiring reliable fuse protection in free-hanging configurations.

Equivalent and substitute parts are identified when alternative fuse holders meet the same electrical specifications, mechanical form factors, and mounting requirements, enabling component interchangeability in circuit designs.

Substiute Parts

BK/HMF

Eaton - Electronics DivisionIn Stock: 1207BK/HMF Datasheet

Current PartRFQ

01550004ZXA

Littelfuse Inc.In Stock: 110701550004ZXA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/HMF fuse holder is determined by strict alignment of the following critical parameters:

Mechanical Compatibility:

• Fuse size must be 0.25" diameter by 0.625" length (6.35mm x 15.88mm) to ensure physical fit
• Mounting type must be free hanging (in-line) configuration
• Termination must be wire leads

Electrical Compatibility:

• Voltage rating must be 32V or higher
• Number of circuits must be 1
• Fuse type must be cartridge format (1AG)

Regulatory and Environmental:

• RoHS compliance status must be documented
• Moisture sensitivity level must be specified

The substitute part 01550004ZXA (Littelfuse Inc., Series 155) meets all mechanical and electrical compatibility criteria. However, the current rating differs: the substitute is rated for 4 A versus the main part's 20 A rating. This difference means the substitute is suitable only for applications requiring lower current protection and cannot be used interchangeably in circuits designed for 20 A protection.

Parameter Comparison

Engineering Selection Recommendations

Primary Application (BK/HMF): The BK/HMF is the specified component for circuits requiring 20 A protection at 32V with in-line cartridge fuse configuration. This part is active, widely available (1130 units in stock), and carries RoHS Compliance certification with MSL 1 rating, indicating no moisture-related storage restrictions.

Substitute Consideration (01550004ZXA): The Littelfuse 01550004ZXA is mechanically and electrically compatible in form factor and mounting configuration. However, the 4 A current rating makes this substitute applicable only to circuits designed for lower current protection levels. This part is also active and available (1060 units in stock) with ROHS3 Compliance. Selection between these two parts must be based on the actual current protection requirement of the application, not on interchangeability.

Compliance Status: Both parts meet current RoHS requirements. The BK/HMF carries RoHS Compliant status, while the 01550004ZXA carries ROHS3 Compliant status, both acceptable for modern electronic applications.

Frequently Asked Questions (FAQ)

Q: Can the 01550004ZXA (4 A) be used as a direct replacement for the BK/HMF (20 A)?

A: No. While both parts share identical mechanical form factors and mounting configurations, the current ratings differ significantly. The 01550004ZXA provides 4 A protection, whereas the BK/HMF provides 20 A protection. Using a lower-rated fuse holder in a 20 A circuit will result in nuisance fuse operation and circuit failure. Substitution is only valid when the application circuit is designed for 4 A protection.

Q: Are the fuse cartridges interchangeable between these two holders?

A: Yes, both holders accept the same 1AG cartridge fuse format (0.25" diameter x 0.625" length). However, the fuse amperage rating must match the holder's rated current. A 20 A fuse must be used with the BK/HMF, and a 4 A fuse must be used with the 01550004ZXA.

Q: What does the wire leads termination style mean?

A: Wire leads termination indicates that the fuse holder connects to the circuit via two flexible wire conductors rather than through PCB mounting pads or terminal blocks. This configuration is typical for in-line, free-hanging applications where the holder is suspended in the circuit path.

Q: Are both parts RoHS compliant?

A: Yes. The BK/HMF carries RoHS Compliant certification, and the 01550004ZXA carries ROHS3 Compliant certification. Both meet current regulatory requirements for hazardous substance restrictions in electronic components.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant?

A: ROHS3 represents the third iteration of RoHS regulations with updated substance restrictions. Both certifications indicate compliance with hazardous substance limitations; ROHS3 is the more recent standard. Both are acceptable for current applications.

Q: Does the MSL 1 rating on the BK/HMF affect storage or handling?

A: No. MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life with no special moisture control requirements during storage or handling. This is the least restrictive MSL rating and requires no special precautions.