Littelfuse 03420001X Fuse Holder - Equivalent & Substitute Parts

Part Overview

The Littelfuse 03420001X is a cartridge fuse holder rated for 20 A at 250V, designed for single-circuit panel mount applications. This component accommodates 3AG cartridge fuses measuring 0.25" diameter by 1.26" length (6.35mm x 32mm). The part is classified as obsolete, making identification of active equivalent models essential for ongoing procurement and system maintenance.

Substiute Parts

03420001X

Littelfuse Inc.In Stock: 117603420001X Datasheet

Current PartRFQ

03453LF3HXLN

Littelfuse Inc.In Stock: 93303453LF3HXLN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete Littelfuse 03420001X is based on the following critical parameters that must remain constant:

• Current Rating: 20 A
• Voltage Rating: 250V
• Fuse Size: 0.25" Dia x 1.26" L (6.35mm x 32mm)
• Fuse Type: Cartridge (3AG, 1/4" x 1-1/4")
• Number of Circuits: 1
• Mounting Type: Panel Mount
• RoHS Compliance: ROHS3 Compliant

The substitute part 03453LF3HXLN maintains all critical electrical and mechanical parameters. Variations in termination style (Quick Connect vs. Solder Lug) and contact material (Copper Alloy vs. Brass) are permissible within the same functional category, provided the electrical performance and physical form factor remain unchanged.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 03453LF3HXLN is the active equivalent for the obsolete 03420001X. Both parts maintain identical electrical ratings (20 A, 250V) and physical form factors (0.25" x 1.26" cartridge). The substitute part carries Active product status, ensuring long-term availability and supply chain continuity.

Both parts are ROHS3 Compliant, meeting current environmental and regulatory requirements. The primary design difference is the termination interface: the original uses Solder Lug termination, while the substitute employs Quick Connect - 0.187" (4.7mm) termination. This difference requires evaluation of the circuit board or panel layout to confirm compatibility with the connection method.

Frequently Asked Questions (FAQ)

Q: Can the 03453LF3HXLN directly replace the 03420001X without circuit modification?

A: Both parts maintain identical electrical and mechanical specifications for fuse accommodation. However, the termination style differs: the original uses Solder Lug while the substitute uses Quick Connect - 0.187" (4.7mm). Circuit board or panel layout must accommodate the Quick Connect interface.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts are rated for 20 A at 250V and accept the same 3AG cartridge fuse size (0.25" Dia x 1.26" L). Electrical performance is equivalent.

Q: What is the significance of the contact material difference (Brass vs. Copper Alloy)?

A: Both materials provide adequate electrical conductivity and are tin-finished. The contact material difference does not affect the functional performance within the specified electrical parameters.

Q: Are both parts RoHS compliant?

A: Yes. Both the 03420001X and 03453LF3HXLN are ROHS3 Compliant.

Q: Why is the original part marked as Obsolete?

A: The 03420001X belongs to the 342 series, which has been superseded by the 345 series (represented by 03453LF3HXLN). The newer series maintains functional equivalence while offering improved availability and active manufacturing support.