Bel Fuse Inc. 5MF 5 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5MF 5 is a 5 A, 125 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement. The fuse requires a compatible holder for installation and is designed for general-purpose circuit protection applications.

Substiute Parts

5MF 5

Bel Fuse Inc.In Stock: 9615MF 5 Datasheet

Current PartRFQ

5MF 5-R

Bel Fuse Inc.In Stock: 302415MF 5-R Datasheet

DirectRFQ

BP/GMA-5A

Eaton - Bussmann Electrical DivisionIn Stock: 985BP/GMA-5A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5MF 5 are identified based on strict electrical and mechanical parameter matching:

Direct Substitution Criteria:

• Current Rating: 5 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 (exact match required)
• Mounting Type: Requires Holder (exact match required)

Identified Substitutes:

1. 5MF 5-R (Bel Fuse Inc.) — Direct manufacturer equivalent with identical electrical specifications and active product status
2. BP/GMA-5A (Eaton - Bussmann Electrical Division) — Cross-manufacturer equivalent meeting all core electrical and mechanical parameters

Parameter Comparison

Engineering Selection Recommendations

5MF 5-R (Bel Fuse Inc.) is the primary substitute for the obsolete 5MF 5. Both parts are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications. The 5MF 5-R carries active product status with ROHS3 compliance and expanded approval certifications (cULus). Inventory availability is significantly higher (30,229 units) compared to the original part.

BP/GMA-5A (Eaton - Bussmann) serves as a secondary cross-manufacturer alternative. This part meets all critical electrical parameters (5 A, 125 V AC, fast-blow, 5mm x 20mm) and maintains RoHS compliance. Physical dimensions show a minor tolerance variation (5.20mm diameter versus 5.10mm), which remains within acceptable mechanical compatibility for standard fuse holders. Approval agency certifications are not specified for this part.

For new designs or procurement requiring regulatory compliance documentation, the 5MF 5-R is the recommended selection due to complete certification data and active manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can the 5MF 5-R directly replace the obsolete 5MF 5?

A: Yes. Both parts are manufactured by Bel Fuse Inc. and share identical electrical specifications (5 A, 125 V AC/DC, fast-blow response) and mechanical form factor (5mm x 20mm). The 5MF 5-R is the direct successor with active product status.

Q: What is the difference between the 5MF 5 and 5MF 5-R?

A: The primary differences are product status (obsolete versus active), RoHS compliance (non-compliant versus ROHS3 compliant), and DC cold resistance (0.017 Ohms versus 0.016 Ohms). Electrical performance and mechanical dimensions are equivalent.

Q: Is the BP/GMA-5A mechanically compatible with 5mm x 20mm fuse holders?

A: The BP/GMA-5A has a diameter of 5.20mm compared to the 5.10mm specification of the 5MF series. This 0.10mm variation falls within typical mechanical tolerances for standard fuse holder designs. Physical compatibility should be verified for specific holder implementations.

Q: What certifications apply to substitute parts?

A: The 5MF 5-R carries CE, CSA, cULus, and PSE certifications. The BP/GMA-5A certification status is not specified in available documentation. For applications requiring specific regulatory approvals, verify certification requirements against the 5MF 5-R documentation.

Q: Are there inventory considerations for part selection?

A: The 5MF 5-R has substantially higher inventory availability (30,229 units) compared to the original 5MF 5 (943 units). The BP/GMA-5A has moderate availability (916 units). For long-term supply chain planning, the 5MF 5-R offers superior procurement reliability.