Equivalent & Substitute Parts for 5MFP 4.6

Part Overview

The 5MFP 4.6 is a 4.6 A, 125 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This component is classified as obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where the original part is no longer actively manufactured.

Substiute Parts

5MFP 3.5

Bel Fuse Inc.In Stock: 8775MFP 3.5 Datasheet

Current PartRFQ

5MFP 3.5-R

Bel Fuse Inc.In Stock: 18505MFP 3.5-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5MFP 4.6 is determined by strict equivalence across the following critical parameters:

• Current Rating: 4.6 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 @ Rated Voltage: 10 kA (exact match required)
• Melting I²t: 17 (exact match required)
• Mounting Type: Through Hole (exact match required)

The substitute part 5MFP 4.6-R meets all these criteria and is therefore a direct electrical and mechanical equivalent.

Parameter Comparison

Engineering Selection Recommendations

The 5MFP 4.6-R is the direct substitute for the obsolete 5MFP 4.6. Both parts are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications across all critical parameters. The 5MFP 4.6-R is currently in active production status with higher inventory availability.

The 5MFP 4.6-R offers improved compliance status: it is ROHS3 compliant, whereas the original 5MFP 4.6 is RoHS non-compliant. This makes the 5MFP 4.6-R the preferred choice for new designs and applications subject to RoHS regulations. Both parts maintain equivalent certifications from CE, CSA, and PSE. The original part carried UL approval; verify UL requirement applicability for your specific application.

The DC cold resistance of the 5MFP 4.6-R (0.024 Ohms) is marginally lower than the original part (0.026 Ohms), which is within acceptable tolerance for fuse cartridge applications and does not affect functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can the 5MFP 4.6-R be used as a direct replacement for the 5MFP 4.6 in existing designs?

A: Yes. The 5MFP 4.6-R is electrically and mechanically equivalent to the 5MFP 4.6 across all critical parameters: current rating, voltage rating, fuse type, response time, package dimensions, breaking capacity, and melting I²t. Both are through-hole mounted 5mm x 20mm axial cartridge fuses rated for 4.6 A at 125 V AC/DC with fast-blow response.

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

A: The original 5MFP 4.6 is RoHS non-compliant. The substitute 5MFP 4.6-R is ROHS3 compliant. If your application or market requires RoHS compliance, the 5MFP 4.6-R is the appropriate choice.

Q: Are there any differences in regulatory approvals?

A: Both parts carry CE, CSA, and PSE approvals. The original 5MFP 4.6 additionally carries UL approval. If UL certification is required for your application, verify whether the 5MFP 4.6-R meets your specific UL requirements before implementation.

Q: How do the DC cold resistance values affect substitution?

A: The DC cold resistance difference (0.026 Ohms for 5MFP 4.6 versus 0.024 Ohms for 5MFP 4.6-R) is negligible for fuse cartridge applications and does not impact functional equivalence or circuit performance.

Q: Is the 5MFP 4.6-R available in the same packaging as the original part?

A: The 5MFP 4.6-R is supplied in bulk packaging, whereas the original 5MFP 4.6 packaging type is not specified in the available data. Both parts maintain identical physical dimensions (5mm x 20mm axial form factor) and are compatible with the same through-hole mounting footprints.