5SFP 400 Equivalent & Substitute Parts

Part Overview

The 5SFP 400 is a 400 mA, 250 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, making substitute parts necessary for ongoing system maintenance and new design implementations. The fuse is designed for through-hole mounting applications requiring fast response protection in circuits rated up to 250 V AC.

Substiute Parts

5SFP 400

Bel Fuse Inc.In Stock: 11175SFP 400 Datasheet

Current PartRFQ

0217.400MXEP

LittelfuseIn Stock: 19760217.400MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5SFP 400 is determined by strict equivalence across 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 form factor (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity: 35 A (exact match required)

The substitute part 0217.400MXEP (Littelfuse 217 series) meets all these criteria and is therefore a direct functional equivalent. Physical dimensions show minor variations (0.228" Dia x 0.886" L vs. 0.217" Dia x 0.827" L), which remain within acceptable tolerances for standard through-hole fuse holder compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 0217.400MXEP from Littelfuse is the direct substitute for the obsolete 5SFP 400. Both parts share identical electrical and mechanical specifications across all critical parameters. The Littelfuse part offers the advantage of active product status with current manufacturing support and improved RoHS3 compliance. Regulatory certifications overlap substantially (CE, CSA, SEMKO, UL, VDE), with the Littelfuse variant including additional CCC and K-MARK approvals. For new designs or system replacements, the 0217.400MXEP is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can the 0217.400MXEP be used as a direct replacement for the 5SFP 400?

A: Yes. Both parts are electrically and mechanically equivalent across all critical parameters: 400 mA current rating, 250 V AC voltage rating, fast-blow response, 35 A breaking capacity, and 5mm x 20mm axial package. Minor physical dimension variations do not affect compatibility with standard through-hole fuse holders.

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

A: The 5SFP 400 is RoHS non-compliant, while the 0217.400MXEP is ROHS3 compliant. For applications subject to RoHS3 regulations, the Littelfuse part is the required selection.

Q: Are there differences in regulatory approvals?

A: Both parts carry CE, CSA, SEMKO, UL, and VDE certifications. The 0217.400MXEP includes additional CCC and K-MARK approvals. The 5SFP 400 includes IMQ approval. These differences do not affect functional equivalence in standard applications.

Q: Why is the 5SFP 400 listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Bel Fuse Inc. The 0217.400MXEP from Littelfuse provides continued availability for this fuse specification.

Q: Are there any thermal or resistance differences to consider?

A: DC cold resistance differs between parts (0.67 Ohms for 5SFP 400 vs. 0.277 Ohms for 0217.400MXEP), and melting I²t values vary (0.17 vs. 0.125). These differences are within acceptable tolerances for fast-blow fuse operation and do not affect substitution suitability for standard circuit protection applications.