Littelfuse 0FHA0004Z Fuse Holder Blade Equivalent & Substitute Parts

Part Overview

The Littelfuse 0FHA0004Z is a blade fuse holder rated for 4A at 32V, designed for inline mounting with wire lead termination. This component is classified as obsolete, making identification of compatible substitute parts essential for system maintenance and component replacement in existing installations. The holder accommodates standard ATC/ATO blade fuses with dimensions of 0.75" L x 0.2" W (19.1mm x 5.1mm).

Substiute Parts

0FHA0004Z

Littelfuse Inc.In Stock: 10220FHA0004Z Datasheet

Current PartRFQ

BK/HHC-R

Eaton - Bussmann Electrical DivisionIn Stock: 1781BK/HHC-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0FHA0004Z is determined by the following critical parameters:

Mandatory Matching Parameters:

• Voltage Rating: 32V (must be equal or greater)
• Fuse Size: 0.75" L x 0.2" W (19.1mm x 5.1mm)
• Fuse Type: Blade
• Compatible Standards: ATC/ATO
• Mounting Type: Free Hanging (In-Line)
• Number of Circuits: 1
• Termination Style: Wire Leads

Allowable Variation:

• Current Rating: The substitute part may have a higher current rating than the original 4A specification, provided all other parameters remain constant. The substitute BK/HHC-R is rated for 16A, which is compatible with the same physical form factor and electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

The Eaton Bussmann BK/HHC-R serves as a direct substitute for the obsolete Littelfuse 0FHA0004Z based on electrical and mechanical parameter alignment. Both components share identical voltage rating (32V), fuse size (0.75" L x 0.2" W), mounting configuration (free hanging in-line), and termination style (wire leads). Both are ROHS3 compliant and support ATC/ATO blade fuse standards.

The BK/HHC-R carries an active product status, ensuring ongoing availability and supply chain continuity. The higher current rating (16A versus 4A) does not preclude substitution, as the physical form factor and electrical interface remain unchanged. The substitute part maintains compatibility with existing circuit designs that utilize the original 0FHA0004Z specification.

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK/HHC-R replace the Littelfuse 0FHA0004Z in existing applications?

A: Yes. Both components share identical voltage rating, fuse size, mounting type, and termination style. The substitute part is mechanically and electrically compatible with the original specification.

Q: Why does the substitute part have a higher current rating (16A vs. 4A)?

A: Current rating is an allowable variation parameter for blade fuse holders with identical physical form factors. The 16A rating of the BK/HHC-R does not affect its ability to accommodate the same fuse size or operate at the same voltage. The actual circuit protection is determined by the fuse element installed in the holder, not the holder's rated capacity.

Q: Are both parts RoHS compliant?

A: Yes. Both the Littelfuse 0FHA0004Z and Eaton BK/HHC-R are ROHS3 compliant.

Q: What fuse types are compatible with these holders?

A: Both holders support ATC and ATO blade fuse standards with dimensions of 0.75" L x 0.2" W (19.1mm x 5.1mm).

Q: Is the BK/HHC-R currently available?

A: Yes. The Eaton BK/HHC-R carries an active product status, ensuring availability for new orders and replacements.

Q: Are there any packaging differences between the original and substitute part?

A: The Littelfuse 0FHA0004Z is available in standard packaging, while the Eaton BK/HHC-R is supplied in bulk packaging. Both are suitable for component-level replacement.