Littelfuse 851/856 Cartridge Fuse Holder 10A 250V Panel Mount - Equivalent & Substitute Parts

Part Overview

The Littelfuse 851/856 is a cartridge fuse holder designed for 10A, 250V applications with panel mount configuration. This component provides a single-circuit mounting solution for 5mm x 20mm cartridge fuses using quick connect termination. The main part (851/856) carries an obsolete product status, making identification of active equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

851/856

Littelfuse Inc.In Stock: 925851/856 Datasheet

Current PartRFQ

85100001009

Littelfuse Inc.In Stock: 99385100001009 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 851/856 is determined by strict equivalence across the following critical parameters:

• Current Rating: 10 A (exact match required)
• Voltage Rating: 250V (exact match required)
• Fuse Size: 5mm x 20mm cartridge (exact match required)
• Mounting Type: Panel Mount (exact match required)
• Number of Circuits: 1 (exact match required)
• Termination Style: Quick Connect - 0.110" (2.8mm) (exact match required)
• Contact Material: Copper Alloy (exact match required)
• Contact Finish: Tin (exact match required)

The substitute part 85100001009 meets all electrical and mechanical parameters required for direct substitution. The primary distinction between the main part and its substitute is product status and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 85100001009 is the direct functional equivalent to the obsolete 851/856 cartridge fuse holder. Both components share identical electrical ratings (10A, 250V), mechanical dimensions (5mm x 20mm), and termination specifications (Quick Connect - 0.110").

The 85100001009 offers the advantage of active product status, ensuring ongoing availability and manufacturer support. Additionally, the 85100001009 meets ROHS3 compliance and carries REACH Unaffected status, making it suitable for applications requiring modern regulatory adherence. The 851/856, classified as RoHS non-compliant, is appropriate only for legacy system maintenance where regulatory requirements do not apply.

For new designs or system upgrades, the 85100001009 is the appropriate selection. For legacy system repairs requiring exact original specifications, the 851/856 remains functionally equivalent where regulatory constraints permit its use.

Frequently Asked Questions (FAQ)

Q: Can the 85100001009 be used as a direct replacement for the 851/856 in existing applications?

A: Yes. Both components are electrically and mechanically identical across all critical parameters: 10A current rating, 250V voltage rating, 5mm x 20mm fuse size, panel mount configuration, and quick connect termination. Physical installation and electrical performance are equivalent.

Q: What is the primary difference between these two parts?

A: The 851/856 is classified as obsolete with RoHS non-compliant status. The 85100001009 is an active product meeting ROHS3 compliance and REACH Unaffected requirements. Functionally, both components are identical.

Q: Are there any compatibility concerns when substituting the 85100001009 for the 851/856?

A: No compatibility concerns exist from an electrical or mechanical standpoint. Both components accept the same 5mm x 20mm cartridge fuses and use identical quick connect termination. Substitution is direct.

Q: Which part should be selected for new designs?

A: The 85100001009 should be selected for new designs. It carries active product status and meets current regulatory requirements (ROHS3, REACH Unaffected), ensuring long-term availability and compliance.

Q: Is the 851/856 still available for purchase?

A: The 851/856 is classified as obsolete. The 85100001009 serves as its active equivalent and is the recommended source for procurement.