Littelfuse 800/816 Cartridge Fuse Holder - Equivalent & Substitute Parts

Part Overview

The Littelfuse 800/816 is a panel-mounted cartridge fuse holder rated for 6.3 A at 250V, designed for single-circuit applications using 3AG cartridge fuses (0.25" Dia x 1.26" L). This component is classified as obsolete, making identification of compatible alternatives essential for ongoing system maintenance and new design implementations. The substitute part maintains mechanical and electrical compatibility while offering improved product status and regulatory compliance.

Substiute Parts

800/816

Littelfuse Inc.In Stock: 741800/816 Datasheet

Current PartRFQ

03453LS2H

Littelfuse Inc.In Stock: 92903453LS2H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 800/816 is based on the following critical parameters that must remain constant:

• Voltage Rating: 250V (non-negotiable for electrical safety)
• Fuse Type & Size: Cartridge format, 0.25" Dia x 1.26" L (3AG standard)
• Mounting Configuration: Panel mount with identical mechanical footprint
• Termination Style: Quick Connect - 0.187" (4.7mm) terminals
• Contact Material & Finish: Copper Alloy with Tin finish
• Number of Circuits: Single circuit

The substitute part (03453LS2H) maintains all these parameters while differing in current rating (20 A vs. 6.3 A) and product status (Active vs. Obsolete). The higher current rating of the substitute does not prevent its use in applications designed for the original 6.3 A holder, as fuse holders are passive components that accommodate the fuse element's current-limiting function.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 03453LS2H serves as a direct mechanical and electrical substitute for the obsolete 800/816 model. Selection of the substitute is justified on the following grounds:

Product Status: The original 800/816 is classified as obsolete, limiting availability for new procurement and long-term supply chain reliability. The 03453LS2H is active production, ensuring consistent availability and manufacturing support.

Regulatory Compliance: The substitute meets ROHS3 compliance standards, whereas the original is RoHS non-compliant. For applications subject to environmental or procurement regulations, the substitute aligns with current regulatory requirements.

Mechanical & Electrical Compatibility: All critical parameters—voltage rating, fuse type, size, mounting configuration, and termination style—are identical between the two models. The substitute's higher current rating (20 A vs. 6.3 A) does not compromise compatibility, as the fuse element (not the holder) determines circuit protection.

Inventory & Lead Time: The substitute is available in production quantities (828 Pcs), whereas the original is obsolete stock (682 Pcs). For new designs or system replacements, the substitute ensures long-term component availability.

Frequently Asked Questions (FAQ)

Q: Can the 03453LS2H be used as a direct replacement for the 800/816 in existing equipment?

A: Yes. The substitute maintains identical mechanical mounting, electrical voltage rating, fuse type/size compatibility, and termination style. No circuit modifications or mechanical rework are required.

Q: Why does the substitute have a higher current rating (20 A vs. 6.3 A)?

A: Fuse holders are passive components that accommodate fuse elements. The holder's current rating indicates its maximum safe operating capacity. A higher-rated holder does not alter circuit protection, which is determined by the fuse element installed. The 6.3 A fuse element will continue to provide the same protection level.

Q: Is the substitute compatible with the same 3AG cartridge fuses?

A: Yes. Both the original and substitute accept 3AG cartridge fuses (0.25" Dia x 1.26" L / 6.35mm x 32mm). Fuse element selection remains unchanged.

Q: What is the difference in RoHS compliance between the two models?

A: The original 800/816 is RoHS non-compliant, while the 03453LS2H meets ROHS3 standards. For applications in regulated industries or regions with environmental compliance requirements, the substitute is the appropriate choice.

Q: Are there any packaging differences between the two models?

A: The original is supplied in standard packaging, while the substitute is supplied in bulk packaging. This does not affect component functionality or compatibility.

Q: Can the 800/816 and 03453LS2H be used interchangeably in new designs?

A: The 03453LS2H is recommended for new designs due to its active production status and regulatory compliance. The 800/816 should not be specified for new applications given its obsolete classification.