Littelfuse 03420858H Cartridge Fuse Holder - Equivalent & Substitute Parts

Part Overview

The Littelfuse 03420858H is a panel-mounted cartridge fuse holder rated for 20 A at 250V, designed for single-circuit applications using 3AG cartridge fuses (0.25" Dia x 1.26" L). This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts become necessary when the primary manufacturer part is unavailable, when supply chain optimization is required, or when design flexibility permits the use of functionally identical alternatives from qualified manufacturers.

Substiute Parts

03420858H

Littelfuse Inc.In Stock: 103603420858H Datasheet

Current PartRFQ

BK/HTB-46I

Eaton - Electronics DivisionIn Stock: 665BK/HTB-46I Datasheet

DirectRFQ

BK/HTB-46I-R

Eaton - Electronics DivisionIn Stock: 2394BK/HTB-46I-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 03420858H is determined by strict equivalence across the following critical parameters: current rating (20 A), voltage rating (250V), fuse size (0.25" Dia x 1.26" L), fuse type (Cartridge), mounting configuration (Panel Mount), circuit count (1), and termination style (Quick Connect - 0.250"). All substitute parts listed meet these requirements without deviation. The substitute parts identified are BK/HTB-46I and BK/HTB-46I-R, both manufactured by Eaton - Electronics Division under the HTB series.

Parameter Comparison

Engineering Selection Recommendations

All three parts—Littelfuse 03420858H, Eaton BK/HTB-46I, and Eaton BK/HTB-46I-R—are Active status products with full electrical and mechanical equivalence. The Littelfuse 03420858H and Eaton BK/HTB-46I-R both carry ROHS3 compliance certification. The Eaton BK/HTB-46I carries RoHS compliance. Both Littelfuse 03420858H and Eaton BK/HTB-46I-R maintain REACH Unaffected status. All three parts share identical ECCN (EAR99) and HTSUS (8538.90.8180) classifications. Selection between these parts may be based on inventory availability, supply chain logistics, or existing vendor relationships, as all meet identical electrical and mechanical specifications for 20 A, 250V cartridge fuse holder applications with panel mount configuration.

Frequently Asked Questions (FAQ)

Q: Can Eaton BK/HTB-46I and BK/HTB-46I-R be used interchangeably with Littelfuse 03420858H?

A: Yes. All three parts meet identical electrical specifications (20 A, 250V), mechanical dimensions (0.25" Dia x 1.26" L), fuse type (Cartridge), mounting configuration (Panel Mount), and termination style (Quick Connect - 0.250"). They are direct functional equivalents.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by matching current rating (20 A), voltage rating (250V), fuse size (0.25" Dia x 1.26" L), fuse type (Cartridge), mounting type (Panel Mount), number of circuits (1), and termination style (Quick Connect - 0.250"). All listed substitutes meet these criteria without exception.

Q: Are there compliance differences between the three parts?

A: The Littelfuse 03420858H and Eaton BK/HTB-46I-R are ROHS3 compliant. The Eaton BK/HTB-46I is RoHS compliant. The Littelfuse 03420858H and Eaton BK/HTB-46I-R are REACH Unaffected. All three carry EAR99 ECCN classification and 8538.90.8180 HTSUS code.

Q: What is the compatible fuse specification for these holders?

A: These holders are designed for 3AG cartridge fuses with dimensions 0.25" Dia x 1.26" L (6.35mm x 32mm), rated for 20 A at 250V.

Q: Does packaging affect substitution?

A: All three parts are supplied in Bulk packaging. Packaging format does not affect electrical or mechanical compatibility.