Equivalent & Substitute Parts for 5TT 8 Ceramic Fuse

Part Overview

The 5TT 8 is an 8A 125VAC ceramic cartridge fuse manufactured by Bel Fuse Inc., designed for applications requiring slow-blow response characteristics in a 5mm x 20mm form factor. This fuse is classified as obsolete, which necessitates identification of active equivalent parts for continued component sourcing and system maintenance. The substitute part maintains identical electrical and mechanical specifications while offering improved availability and current compliance status.

Substiute Parts

5TT 8

Bel Fuse Inc.In Stock: 8315TT 8 Datasheet

Current PartRFQ

5TT 8-R

Bel Fuse Inc.In Stock: 95145TT 8-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 5TT 8-R qualifies as a direct substitute for the 5TT 8 based on matching electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Current rating: 8 A (identical)
• Voltage rating: 125 V AC (identical)
• Fuse type: Cartridge, Ceramic (identical)
• Physical dimensions: 5mm x 20mm (identical)
• Response characteristic: Slow Blow (identical)
• Breaking capacity: 10kA (identical)
• Operating temperature range: -55°C ~ 125°C (identical)
• Approval certifications: CE, CSA, PSE (identical)

The primary distinction between these parts is product status and compliance posture, not functional performance.

Parameter Comparison

Engineering Selection Recommendations

The 5TT 8-R is the appropriate selection for new designs and component replenishment. This part maintains full electrical and mechanical compatibility with the obsolete 5TT 8 while offering active product status and ROHS3 compliance. The substitute part carries identical regulatory certifications (CE, CSA, PSE) and operates within the same temperature envelope. For applications where RoHS compliance is a system requirement, the 5TT 8-R satisfies this constraint whereas the original part does not.

Frequently Asked Questions (FAQ)

Q: Can the 5TT 8-R be used as a direct replacement for the 5TT 8?

A: Yes. Both parts share identical electrical ratings (8A, 125VAC), fuse type (ceramic cartridge), physical dimensions (5mm x 20mm), response characteristic (slow blow), and regulatory certifications. The parts are mechanically and electrically interchangeable.

Q: What is the difference between these two part numbers?

A: The 5TT 8 is classified as obsolete, while the 5TT 8-R is active. The 5TT 8-R also carries ROHS3 compliance, whereas the 5TT 8 does not. Functionally, both parts perform identically in circuit applications.

Q: Does the 5TT 8-R require the same holder as the 5TT 8?

A: Yes. Both parts are 5mm x 20mm ceramic cartridge fuses that require a compatible fuse holder. No changes to mounting hardware or holder specifications are necessary.

Q: Are there any temperature or voltage limitations when substituting the 5TT 8-R?

A: No. The 5TT 8-R operates across the same temperature range (-55°C ~ 125°C) and maintains the same voltage rating (125VAC) as the original part.

Q: What certifications apply to the 5TT 8-R?

A: The 5TT 8-R carries CE, CSA, and PSE approvals, matching the certification profile of the 5TT 8.