Littelfuse 810/816 Cartridge Fuse Holder - Equivalent & Substitute Parts

Part Overview

The Littelfuse 810/816 is a through-hole mounted cartridge fuse holder rated for 6.3 A at 250V, designed for single-circuit PCB applications using 3AG (0.25" Dia x 1.26" L) fuse cartridges. This product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component procurement.

Substiute Parts

810/816

Littelfuse Inc.In Stock: 1197810/816 Datasheet

Current PartRFQ

03450101H

Littelfuse Inc.In Stock: 737803450101H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 810/816 is determined by the following critical parameters:

• Fuse Cartridge Compatibility: Both the main part and substitute must accept 3AG (0.25" Dia x 1.26" L) cartridge fuses
• Mounting Configuration: Through-hole mounting with horizontal orientation and PC pin termination
• Single-Circuit Design: Fuseholder must support one circuit only
• Mechanical Fit: Identical fuse cavity dimensions ensure physical interchangeability

The substitute part 03450101H meets these mechanical and dimensional requirements. However, the substitute operates at higher electrical ratings (15 A at 600V versus 6.3 A at 250V). Substitution is valid only when the application circuit operates within the substitute's electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 03450101H is the manufacturer-recommended substitute for the obsolete 810/816. Selection of this substitute is appropriate based on the following factors:

• Active Product Status: The 03450101H is in active production, ensuring long-term availability and supply chain continuity
• Environmental Compliance: The substitute meets ROHS3 and REACH standards, satisfying current regulatory requirements
• Mechanical Compatibility: Identical fuse cavity dimensions and mounting configuration ensure direct PCB fit without layout modifications
• Electrical Derating: The substitute's higher current (15 A) and voltage (600V) ratings provide margin above the original 6.3 A / 250V specification, allowing use in applications operating at or below the original electrical parameters

Selection of the 03450101H does not require PCB redesign or mechanical rework when the application circuit operates within the original 810/816 electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can the 03450101H be used as a direct replacement for the 810/816 on existing PCBs?

A: Yes. Both parts accept identical 3AG cartridge fuses, feature through-hole mounting with horizontal orientation, and use PC pin termination. No PCB layout modifications are required.

Q: What is the significance of the higher current and voltage ratings on the 03450101H?

A: The substitute's 15 A and 600V ratings exceed the original 6.3 A and 250V specifications. This allows the substitute to operate safely in applications designed for the original part. The application circuit must not exceed the original electrical parameters to maintain equivalent protection characteristics.

Q: Does the RoHS compliance difference affect substitution?

A: The 03450101H's ROHS3 compliance is advantageous for new designs and manufacturing environments subject to environmental regulations. Existing applications using the non-compliant 810/816 may substitute the compliant 03450101H without functional impact.

Q: Are there any packaging differences between the two parts?

A: The 810/816 packaging specification is not provided in the available data. The 03450101H is supplied in bulk packaging. Confirm packaging requirements with your procurement specification before ordering.

Q: What fuse cartridges are compatible with both the 810/816 and 03450101H?

A: Both holders accept 3AG cartridge fuses with dimensions 0.25" Dia x 1.26" L (6.35mm x 32mm). Fuse selection must match the application's circuit protection requirements.