5SFP 315-R Equivalent & Substitute Parts

Part Overview

The 5SFP 315-R is a 315 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 equivalent substitute parts necessary for ongoing system maintenance and new designs requiring this electrical specification.

Substiute Parts

5SFP 315-R

Bel Fuse Inc.In Stock: 9265SFP 315-R Datasheet

Current PartRFQ

BK/S500-V-315-R

Eaton - Electronics DivisionIn Stock: 844BK/S500-V-315-R Datasheet

DirectRFQ

0217.315MXEP

Littelfuse Inc.In Stock: 8750217.315MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5SFP 315-R are qualified based on the following critical parameters:

• Current Rating: 315 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 (mechanical compatibility required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity: 35A (exact match required)

All listed substitute parts meet these core electrical and mechanical criteria, ensuring functional equivalence in circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

Both BK/S500-V-315-R (Eaton) and 0217.315MXEP (Littelfuse) are active-status alternatives to the obsolete 5SFP 315-R. Selection between these substitutes should be based on:

BK/S500-V-315-R (Eaton - Electronics Division): This part maintains active product status and carries BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE certifications. It is suitable for applications where Eaton component qualification is required.

0217.315MXEP (Littelfuse Inc.): This part maintains active product status with CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications. It provides an alternative with UL certification and matches the original operating temperature range of -55°C ~ 125°C.

Both parts satisfy the electrical and mechanical requirements for direct substitution in circuits designed for the 5SFP 315-R.

Frequently Asked Questions (FAQ)

Q: Can BK/S500-V-315-R and 0217.315MXEP be used interchangeably with 5SFP 315-R?

A: Yes. All three parts share identical current rating (315 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), package dimensions (5mm x 20mm axial), and breaking capacity (35A). They are mechanically and electrically equivalent for circuit protection applications.

Q: What are the differences in DC cold resistance between these parts?

A: The 5SFP 315-R has 0.5 Ohms, the 0217.315MXEP has 0.88 Ohms, and the BK/S500-V-315-R has 3.1 Ohms. These variations reflect different internal construction but do not affect the fuse's primary function as a circuit protection device at the specified current and voltage ratings.

Q: Are there differences in melting I²t values?

A: Yes. The 5SFP 315-R has a melting I²t of 0.1, the 0217.315MXEP has 0.11, and the BK/S500-V-315-R has 0.58. These values indicate the thermal energy required to melt the fuse element. Minor variations within this range do not prevent functional substitution for standard circuit protection applications.

Q: Which substitute part has the broadest certification coverage?

A: The 0217.315MXEP (Littelfuse) carries UL certification in addition to CCC, CE, CSA, K-MARK, SEMKO, and VDE. The BK/S500-V-315-R (Eaton) includes BSI certification. Selection should align with your application's specific regulatory requirements.

Q: Is operating temperature range a factor in substitution?

A: The 5SFP 315-R and 0217.315MXEP both specify -55°C ~ 125°C. The BK/S500-V-315-R does not specify an operating temperature range in the provided data. For applications with extreme temperature requirements, the 0217.315MXEP provides explicit temperature specification matching the original part.