5SFP 400-R Equivalent & Substitute Parts

Part Overview

The 5SFP 400-R is a 400 mA, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm axial package manufactured by Bel Fuse Inc. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The fuse is designed for through-hole mounting applications requiring fast-response overcurrent protection in industrial and commercial equipment.

Substiute Parts

5SFP 400-R

Bel Fuse Inc.In Stock: 8055SFP 400-R Datasheet

Current PartRFQ

0217.400MXEP

LittelfuseIn Stock: 19760217.400MXEP Datasheet

DirectRFQ

BK/S500-V-400-R

Eaton - Electronics DivisionIn Stock: 1124BK/S500-V-400-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5SFP 400-R are qualified based on the following critical parameters:

• Current Rating: 400 mA (exact match required)
• Voltage Rating: 250 V AC (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)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity: 35 A (exact match required)

All substitute parts listed meet these electrical and mechanical specifications. Variations in secondary parameters such as melting I²t, DC cold resistance, and physical dimensions within tolerance are acceptable for functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Both 0217.400MXEP (Littelfuse) and BK/S500-V-400-R (Eaton) are functionally equivalent substitutes for the obsolete 5SFP 400-R.

0217.400MXEP is an active product with ROHS3 compliance and carries approvals from CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. This part is available in bulk packaging with 1940 units in stock.

BK/S500-V-400-R is an active product with RoHS compliance and carries approvals from BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE. This part is available in bulk packaging with 1075 units in stock.

Selection between these two substitutes should be based on design-specific compliance requirements, supply chain availability, and any application-specific certifications mandated by end-use standards.

Frequently Asked Questions (FAQ)

Q: Can 0217.400MXEP and BK/S500-V-400-R be used interchangeably with the 5SFP 400-R?

A: Yes. Both parts meet the critical electrical specifications: 400 mA current rating, 250 V AC voltage rating, fast-blow response, 35 A breaking capacity, and 5mm x 20mm axial package. All three are through-hole mounted glass cartridge fuses with identical functional performance in circuit protection applications.

Q: What are the differences in physical dimensions between these parts?

A: The 5SFP 400-R measures 5.50mm diameter x 21.00mm length. The 0217.400MXEP measures 5.80mm diameter x 22.50mm length. The BK/S500-V-400-R measures 5.54mm diameter x 21.10mm length. These variations are within acceptable tolerance for standard fuse holder designs. Verify mechanical fit in your specific fuse holder before final selection.

Q: Are there differences in melting I²t values?

A: Yes. The 5SFP 400-R has a melting I²t of 0.17, the 0217.400MXEP has 0.125, and the BK/S500-V-400-R has 0.18. These variations represent minor differences in thermal response characteristics but do not affect functional equivalence for standard 400 mA protection applications.

Q: Which substitute part has better availability?

A: The 0217.400MXEP (Littelfuse) has 1940 units in stock, compared to 1075 units for the BK/S500-V-400-R (Eaton). Both are active products with established supply chains.

Q: What compliance certifications should I consider?

A: Both substitutes carry multiple international approvals. The 0217.400MXEP includes UL certification, while the BK/S500-V-400-R includes cULus certification. Select based on your application's specific regulatory requirements (industrial, commercial, or consumer markets).