Bel Fuse Inc. 5TT 7 Ceramic Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5TT 7 is a 7A 125VAC ceramic cartridge fuse in 5mm x 20mm form factor, designed for slow-blow response applications requiring holder mounting. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility. Substitute parts must match the critical electrical parameters (current rating, voltage rating, response time) and physical dimensions to ensure proper operation within existing fuse holder assemblies.

Substiute Parts

5TT 7

Bel Fuse Inc.In Stock: 10885TT 7 Datasheet

Current PartRFQ

5TT 7-R

Bel Fuse Inc.In Stock: 25345TT 7-R Datasheet

DirectRFQ

0239007.MXP

Littelfuse Inc.In Stock: 36080239007.MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

• Current Rating: 7 A (exact match required)
• Voltage Rating (AC): 125 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Breaking Capacity @ Rated Voltage: 10kA (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Two substitute parts meet these criteria: the Bel Fuse Inc. 5TT 7-R (direct manufacturer equivalent, active status) and the Littelfuse Inc. 0239007.MXP (alternative manufacturer, active status). Both maintain identical electrical ratings and physical dimensions. The primary distinction is fuse element material: ceramic versus glass construction.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 5TT 7, the Bel Fuse Inc. 5TT 7-R is the primary equivalent. This part maintains identical electrical specifications, physical dimensions, and ceramic fuse element construction while offering active product status and ROHS3 compliance.

The Littelfuse Inc. 0239007.MXP provides an alternative substitute with equivalent electrical performance and broader regulatory approvals (including UL certification). The glass fuse element construction differs from the original ceramic design but maintains all critical electrical parameters and physical compatibility with standard 5mm x 20mm fuse holders. This part also carries ROHS3 compliance.

Selection between the two substitutes depends on application-specific requirements regarding fuse element material preference and regulatory certification scope. Both parts are actively manufactured and available in production quantities.

Frequently Asked Questions (FAQ)

Q: Can the 5TT 7-R directly replace the obsolete 5TT 7?

A: Yes. The 5TT 7-R maintains identical current rating (7A), voltage rating (125VAC), response time (slow blow), physical dimensions (5mm x 20mm), and breaking capacity (10kA). It is compatible with all fuse holders designed for the original part.

Q: What is the difference between the ceramic 5TT 7-R and glass 0239007.MXP substitutes?

A: Both parts meet identical electrical specifications and physical dimensions. The primary difference is fuse element material: the 5TT 7-R uses ceramic construction (matching the original), while the 0239007.MXP uses glass construction. Both are slow-blow fuses with 10kA breaking capacity at 125VAC.

Q: Are both substitutes RoHS compliant?

A: Yes. Both the 5TT 7-R and 0239007.MXP are ROHS3 compliant, whereas the original 5TT 7 is RoHS non-compliant.

Q: Which substitute has broader regulatory approvals?

A: The Littelfuse 0239007.MXP carries approvals from CE, CSA, KC, PSE, and UL. The Bel Fuse 5TT 7-R carries CE, CSA, and PSE approvals.

Q: Will these substitutes fit existing 5mm x 20mm fuse holders?

A: Yes. Both substitutes maintain the 5mm x 20mm physical dimensions and are designed for standard cartridge fuse holders requiring this form factor.

Q: What is the operating temperature range for these substitutes?

A: Both substitutes operate across -55°C to 125°C, matching the original part specification.