Littelfuse 850/855 Cartridge Fuse Holder - Equivalent & Substitute Parts

Part Overview

The Littelfuse 850/855 is a single-circuit cartridge fuse holder rated for 10 A at 250V with panel mount configuration and 5mm x 20mm fuse compatibility. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where this form factor is required.

Substiute Parts

850/855

Littelfuse Inc.In Stock: 1141850/855 Datasheet

Current PartRFQ

3101.0035

SCHURTER Inc.In Stock: 27393101.0035 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 850/855 is determined by the following critical parameters:

• Fuse Size Compatibility: 5mm x 20mm cartridge format (mechanical interchangeability)
• Mounting Configuration: Panel mount with solder lug termination
• Circuit Count: Single-circuit design
• Contact Material & Finish: Copper alloy with tin finish (electrical performance and reliability)
• Electrical Ratings: Current and voltage ratings must meet or exceed the original specification

The SCHURTER 3101.0035 qualifies as a substitute based on identical mechanical form factor (5mm x 20mm cartridge), matching mounting type (panel mount), identical termination style (solder lug), and compatible contact materials. The substitute accommodates higher electrical ratings (16 A at 400V versus 10 A at 250V), making it suitable for applications where the original part is no longer available.

Parameter Comparison

Engineering Selection Recommendations

The SCHURTER 3101.0035 is the designated substitute for the obsolete Littelfuse 850/855. Selection is based on:

• Product Status: The original part is obsolete; the substitute is active and currently manufactured
• Regulatory Compliance: The substitute meets ROHS3 compliance requirements, whereas the original does not
• Mechanical Compatibility: Identical 5mm x 20mm cartridge form factor ensures direct physical interchangeability in panel mount applications
• Electrical Capability: The substitute's higher current (16 A) and voltage (400V) ratings provide operational margin for the original 10 A at 250V specification
• Manufacturing Continuity: Active production status ensures long-term availability and supply chain reliability

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 3101.0035 be used as a direct replacement for the Littelfuse 850/855?

A: Yes. Both components share identical mechanical specifications (5mm x 20mm cartridge), mounting configuration (panel mount), and termination style (solder lug). The substitute accommodates the original electrical requirements within its higher ratings.

Q: What are the key differences between these two fuse holders?

A: The primary differences are product status (obsolete versus active), RoHS compliance (non-compliant versus ROHS3 compliant), and electrical ratings (10 A at 250V versus 16 A at 400V). Mechanically and functionally, both are single-circuit cartridge fuse holders with identical form factors.

Q: Are there any compatibility concerns with the higher voltage and current ratings of the substitute?

A: No. Higher ratings on the substitute provide operational margin. The substitute will function correctly in applications designed for the original 10 A at 250V specification. Component selection should be based on actual circuit requirements, not the maximum ratings of the holder.

Q: Does the substitute maintain the same contact material and finish?

A: Yes. Both components use copper alloy contacts with tin finish, ensuring equivalent electrical performance and reliability characteristics.

Q: Is the SCHURTER 3101.0035 available in the same packaging as the original?

A: The substitute is supplied in bulk packaging, whereas the original was supplied with standard packaging designation. This affects procurement and inventory management but does not impact functional compatibility.