Equivalent & Substitute Parts for 5MFP 6 Fuse

Part Overview

The 5MFP 6 is a 6A 125VAC fast-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This component is classified as obsolete, indicating it has been discontinued and is no longer in active production. Finding equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing maintenance and repair operations for systems utilizing this fuse specification.

Substiute Parts

5MFP 6

Bel Fuse Inc.In Stock: 11085MFP 6 Datasheet

Current PartRFQ

5MFP 6-R

Bel Fuse Inc.In Stock: 18565MFP 6-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5MFP 6 is determined by strict equivalence across the following critical parameters:

• Current Rating: 6 A (exact match required)
• Voltage Rating (AC): 125 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Breaking Capacity: 10 kA @ Rated Voltage (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)

The substitute part 5MFP 6-R meets all these criteria and is therefore electrically and mechanically interchangeable with the original 5MFP 6 fuse.

Parameter Comparison

Engineering Selection Recommendations

The 5MFP 6-R is the direct substitute for the obsolete 5MFP 6 fuse. Both parts are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications across all critical parameters. The 5MFP 6-R is currently in active production status with 1806 units available in inventory.

The primary distinction between the two parts is regulatory compliance. The 5MFP 6-R achieves ROHS3 compliance, whereas the original 5MFP 6 is non-compliant. The 5MFP 6-R maintains CE, CSA, and PSE certifications. For applications requiring UL certification specifically, this difference should be evaluated against system-level requirements.

Both parts are REACH Unaffected and classified under ECCN EAR99 for export purposes.

Frequently Asked Questions (FAQ)

Q: Can the 5MFP 6-R be used as a direct replacement for the 5MFP 6?

A: Yes. The 5MFP 6-R is electrically and mechanically equivalent to the 5MFP 6 across all critical parameters: current rating, voltage rating, fuse type, response time, package dimensions, breaking capacity, and operating temperature range. Both are through-hole mounted 5mm x 20mm axial cartridge fuses rated for 6A at 125VAC with fast-blow response.

Q: What is the difference in RoHS compliance between these parts?

A: The 5MFP 6 is RoHS non-compliant, while the 5MFP 6-R is ROHS3 compliant. If your application or end-market requires RoHS compliance, the 5MFP 6-R is the appropriate selection.

Q: Are there differences in approval certifications?

A: The 5MFP 6 carries CE, CSA, PSE, and UL certifications. The 5MFP 6-R carries CE, CSA, and PSE certifications. If UL certification is a system requirement, this difference must be addressed at the design or compliance level.

Q: Will the 5MFP 6-R fit in the same footprint as the 5MFP 6?

A: Yes. Both parts have identical dimensions of 0.217" diameter x 0.827" length (5.50mm x 21.00mm) and are through-hole mounted with the same axial form factor.

Q: What is the availability status of these parts?

A: The 5MFP 6 is obsolete with 1087 units in stock. The 5MFP 6-R is active in production with 1806 units in stock, providing better long-term supply chain assurance.