Littelfuse 03420058X Cartridge Fuse Holder - Equivalent & Substitute Parts

Part Overview

The Littelfuse 03420058X 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. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and termination specifications match the original design requirements.

Substiute Parts

03420058X

Littelfuse Inc.In Stock: 67203420058X Datasheet

Current PartRFQ

BK/HTB-42I

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 03420058X 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
• Termination Style: Quick Connect - 0.187" (4.7mm)
• Fuse Type: Cartridge

The Eaton BK/HTB-42I meets all electrical and mechanical substitution criteria, providing functional equivalence for applications requiring a 20 A, 250V single-circuit cartridge fuse holder with panel mounting and quick-connect termination.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 03420058X and Eaton BK/HTB-42I are Active status products with identical electrical and mechanical specifications. Selection between these parts should consider compliance requirements:

The Littelfuse 03420058X is RoHS3 compliant, suitable for applications subject to RoHS directives. The Eaton BK/HTB-42I is RoHS non-compliant and should be selected only for applications where RoHS compliance is not required. Both parts carry EAR99 export classification and share the same HTSUS commodity code, indicating equivalent regulatory treatment for tariff and trade purposes.

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK/HTB-42I directly replace the Littelfuse 03420058X?

A: Yes, from an electrical and mechanical standpoint. Both parts are rated for 20 A at 250V, accept the same 3AG cartridge fuse size (0.25" Dia x 1.26" L), feature panel mounting, and use identical quick-connect termination (0.187"). However, RoHS compliance status differs between the two parts.

Q: What is the significance of the RoHS compliance difference?

A: The Littelfuse 03420058X is RoHS3 compliant, meeting European Union restrictions on hazardous substances. The Eaton BK/HTB-42I is RoHS non-compliant. Applications subject to RoHS directives or customer specifications requiring RoHS compliance must use the Littelfuse part.

Q: Are the quick-connect terminations identical between these parts?

A: Yes. Both parts use Quick Connect - 0.187" (4.7mm) termination, ensuring mechanical and electrical compatibility with the same connector systems.

Q: Do these parts accept the same fuse types?

A: Yes. Both are cartridge fuse holders designed for 3AG cartridge fuses with dimensions 0.25" Dia x 1.26" L (6.35mm x 32mm).

Q: What is the difference in contact material specifications?

A: The Littelfuse 03420058X specifies brass contact material with tin finish. The Eaton BK/HTB-42I does not provide contact material or finish specifications in the available data.