Littelfuse 03420058H Fuse Holder - Equivalent & Substitute Parts

Part Overview

The Littelfuse 03420058H is a cartridge fuse holder rated for 20 A at 250V, designed for single-circuit panel mount applications. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and termination specifications to ensure direct functional replacement in circuit protection applications.

Substiute Parts

03420058H

Littelfuse Inc.In Stock: 91903420058H Datasheet

Current PartRFQ

BK/HTB-42I

Eaton - Electronics DivisionIn Stock: 934BK/HTB-42I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 03420058H are identified based on the following critical parameters:

• Current Rating: 20 A
• Voltage Rating: 250V
• Fuse Size: 0.25" Dia x 1.26" L (6.35mm x 32mm)
• Mounting Configuration: Panel Mount, single circuit
• Termination: Quick Connect - 0.187" (4.7mm)
• Fuse Compatibility: 3AG cartridge standard

Parts matching all these parameters are classified as direct substitutes and can be used interchangeably in the same circuit protection application.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 03420058H and Eaton BK/HTB-42I meet the core electrical and mechanical requirements for 20 A, 250V cartridge fuse holder applications with panel mount configuration.

The Littelfuse 03420058H is RoHS3 compliant, making it the preferred selection for applications subject to RoHS regulations or where compliance documentation is required.

The Eaton BK/HTB-42I is RoHS non-compliant and carries MSL 1 (Unlimited) moisture sensitivity rating. This part is suitable for applications where RoHS compliance is not a requirement.

Both parts share identical electrical ratings, mechanical dimensions, and termination specifications, ensuring functional interchangeability in circuit protection designs.

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK/HTB-42I replace the Littelfuse 03420058H in all applications?

A: Both parts match on all critical electrical and mechanical parameters: 20 A current rating, 250V voltage rating, 0.25" x 1.26" fuse size, panel mount configuration, and Quick Connect termination. The primary difference is RoHS compliance status. Selection depends on regulatory requirements for your application.

Q: What does RoHS3 compliance mean for the Littelfuse part?

A: RoHS3 compliance indicates the Littelfuse 03420058H meets Restriction of Hazardous Substances regulations. The Eaton substitute is RoHS non-compliant and should be selected only when RoHS requirements do not apply.

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

A: Yes. Both holders accept the same 3AG cartridge fuse standard (1/4" x 1-1/4" or SFE-20), so fuse cartridges are fully interchangeable between the two holders.

Q: What is the significance of the Quick Connect termination?

A: Quick Connect - 0.187" (4.7mm) termination allows direct connection to standard 0.187" spade terminals without soldering, enabling rapid assembly and replacement in panel mount applications.

Q: Can these fuse holders be used in applications requiring moisture protection?

A: The Littelfuse 03420058H does not specify MSL rating. The Eaton BK/HTB-42I carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. For moisture-critical applications, verify environmental conditions against the specific holder's design specifications.