Littelfuse 03420001H Cartridge Fuse Holder Equivalent & Substitute Parts

Part Overview

The Littelfuse 03420001H is a cartridge fuse holder rated for 20 A at 250V, designed for panel mount applications with 1 circuit configuration. This component accepts 3AG cartridge fuses (0.25" Dia x 1.26" L / 6.35mm x 32mm). The part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring compatible functionality.

Substiute Parts

03420001H

Littelfuse Inc.In Stock: 82103420001H Datasheet

Current PartRFQ

03453LF3HXLN

Littelfuse Inc.In Stock: 93303453LF3HXLN Datasheet

MFR RecommendedRFQ

BK/HTB-24I-R

Eaton - Electronics DivisionIn Stock: 834BK/HTB-24I-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching 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 Type: Panel Mount
• Number of Circuits: 1
• Fuse Type: Cartridge
• RoHS Compliance: ROHS3 Compliant

All substitute parts listed meet these core electrical and mechanical requirements. Variations in termination style, contact material, and product status are noted but do not prevent functional substitution when circuit design accommodates the specific termination interface.

Parameter Comparison

Engineering Selection Recommendations

Littelfuse 03453LF3HXLN is the manufacturer-recommended substitute. This part maintains Littelfuse series continuity (345 vs. 342) and carries active product status, ensuring long-term availability and support. The primary design consideration is the termination interface change from solder lug to quick connect 0.187" (4.7mm), which requires circuit board layout modification but provides improved serviceability.

Eaton BK/HTB-24I-R is a direct cross-manufacturer alternative from Eaton's HTB series. This option is suitable when multi-source component strategy is required or when Littelfuse supply is constrained. The quick connect termination matches the Littelfuse 03453LF3HXLN, simplifying PCB redesign if both substitutes are considered. Eaton's part carries active status and ROHS3 compliance certification.

Both substitutes are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. Selection between them depends on existing supply chain relationships, PCB termination compatibility, and long-term availability forecasting.

Frequently Asked Questions (FAQ)

Q: Can the 03420001H be directly replaced with 03453LF3HXLN without circuit modification?

A: No. The termination style differs: 03420001H uses solder lug termination, while 03453LF3HXLN uses quick connect 0.187" (4.7mm) termination. PCB footprint and connection method must be updated accordingly.

Q: Are all three parts compatible with 3AG cartridge fuses?

A: Yes. All three fuse holders accept 3AG cartridge fuses rated 0.25" Dia x 1.26" L (6.35mm x 32mm), matching the specified "For Use With/Related Products" designation.

Q: What is the primary reason for substituting the 03420001H?

A: The 03420001H is classified as obsolete. Littelfuse 03453LF3HXLN and Eaton BK/HTB-24I-R are active products with confirmed ongoing availability.

Q: Do all substitutes maintain the same electrical ratings?

A: Yes. All three parts are rated 20 A at 250V with identical fuse size and circuit configuration (1 circuit).

Q: Which substitute offers the shortest lead time?

A: Current inventory data shows 03453LF3HXLN (908 Pcs), BK/HTB-24I-R (773 Pcs), and 03420001H (719 Pcs) in stock. Availability may vary by distributor and region.

Q: Are there packaging differences between substitutes?

A: The 03420001H is packaged as "-" (not specified). Both 03453LF3HXLN and BK/HTB-24I-R are supplied in bulk packaging.