5VT 8 Fuse Glass 8A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The 5VT 8 is a glass cartridge fuse rated at 8 A, 250 V AC/DC with a 5mm x 20mm form factor, manufactured by Bel Fuse Inc. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. Substitute parts must maintain identical electrical ratings and mechanical compatibility to ensure proper circuit protection without redesign.

Substiute Parts

5VT 8

Bel Fuse Inc.In Stock: 9705VT 8 Datasheet

Current PartRFQ

5ET 8-R

Bel Fuse Inc.In Stock: 89265ET 8-R Datasheet

Parametric EquivalentRFQ

5ST 8-R

Bel Fuse Inc.In Stock: 94725ST 8-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5VT 8 is determined by strict equivalence across the following parameters:

• Current Rating: 8 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)

Both identified substitutes, 5ET 8-R and 5ST 8-R, meet all mandatory electrical and mechanical parameters. Both are manufactured by Bel Fuse Inc., carry active product status, and are available in bulk packaging with significantly higher inventory levels than the obsolete 5VT 8.

Parameter Comparison

Engineering Selection Recommendations

Both 5ET 8-R and 5ST 8-R are direct functional equivalents to the 5VT 8. Selection between these two active alternatives should be based on the following criteria:

5ET 8-R provides a breaking capacity of 150A with CE and SEMKO certifications. This option is suitable for applications requiring higher interrupting capacity.

5ST 8-R provides a breaking capacity of 80A with CE, CSA, and cURus certifications. This option offers broader regulatory approvals including North American certification (cURus).

Both substitutes are ROHS3 compliant, addressing environmental compliance requirements that the obsolete 5VT 8 does not meet. Inventory availability is substantially higher for both active alternatives, supporting long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can 5ET 8-R and 5ST 8-R be used interchangeably with 5VT 8?

A: Yes. Both substitutes match the mandatory electrical parameters (8 A, 250 V AC, slow blow response) and mechanical specifications (5mm x 20mm cartridge, requires holder). They are direct functional replacements.

Q: What is the difference between 5ET 8-R and 5ST 8-R?

A: The primary differences are breaking capacity (5ET 8-R: 150A; 5ST 8-R: 80A) and regulatory certifications (5ET 8-R: CE, SEMKO; 5ST 8-R: CE, CSA, cURus). Both maintain identical current, voltage, and form factor specifications.

Q: Why is the 5VT 8 obsolete?

A: The 5VT 8 is classified as obsolete by the manufacturer. The active alternatives 5ET 8-R and 5ST 8-R provide equivalent functionality with improved compliance status (ROHS3) and broader market availability.

Q: Are there any compatibility concerns with existing fuse holders?

A: No. All three parts share identical mechanical specifications (5mm x 20mm cartridge form factor) and require the same holder type. Direct mechanical compatibility is assured.

Q: Which substitute should I select for new designs?

A: For new designs, either 5ET 8-R or 5ST 8-R is appropriate. Selection depends on regulatory requirements for your target market and required breaking capacity. 5ST 8-R offers broader North American certifications (CSA, cURus), while 5ET 8-R provides higher interrupting capacity.