5SFP 3.15-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5SFP 3.15-R is a 3.15 A, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm through-hole axial package. This fuse is designed for circuit protection in industrial and commercial applications requiring fast response characteristics. The part maintains active product status with 1662 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and design standardization across compatible applications.

Substiute Parts

5SFP 3.15-R

Bel Fuse Inc.In Stock: 17205SFP 3.15-R Datasheet

Current PartRFQ

0034.1521.PT

SCHURTER Inc.In Stock: 39520034.1521.PT Datasheet

DirectRFQ

0034.1521.TR

SCHURTER Inc.In Stock: 37430034.1521.TR Datasheet

DirectRFQ

02173.15MXEP

Littelfuse Inc.In Stock: 326302173.15MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5SFP 3.15-R are qualified based on the following critical parameters that must match or remain compatible:

• Current Rating: 3.15 A (exact match required)
• Voltage Rating (AC): 250 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)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All identified substitute parts meet these criteria. Variations in physical dimensions (diameter and length tolerances), melting I²t values, DC cold resistance, and approval agency certifications do not preclude substitution when the above parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—0034.1521.PT, 0034.1521.TR, and 02173.15MXEP—are direct functional equivalents to the 5SFP 3.15-R based on matching electrical and mechanical specifications. Selection among these alternatives should be based on:

Packaging Format: The 0034.1521.PT is supplied in Bulk packaging, while 0034.1521.TR is supplied in Cut Tape (CT) format. Choose based on assembly process requirements and inventory management practices.

Manufacturer Certifications: The 5SFP 3.15-R carries approvals from CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE. The SCHURTER parts (0034.1521.PT and 0034.1521.TR) carry cURus approval. The Littelfuse part (02173.15MXEP) carries approvals from BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. Verify that the selected substitute meets all required regulatory certifications for your application.

Inventory Availability: Current stock levels are 1662 units (5SFP 3.15-R), 3918 units (0034.1521.PT), 3642 units (0034.1521.TR), and 3200 units (02173.15MXEP).

All parts maintain active product status and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 5SFP 3.15-R with any of the listed parts in my circuit?

A: Yes. All listed substitute parts match the critical electrical and mechanical parameters: 3.15 A current rating, 250 V AC voltage rating, fast-blow response, 5mm x 20mm package, 35 A breaking capacity, and -55°C to 125°C operating temperature range. Physical dimension variations and melting I²t differences do not affect functional compatibility in applications designed for the 5SFP 3.15-R.

Q: What is the difference between 0034.1521.PT and 0034.1521.TR?

A: Both parts are identical in electrical and mechanical specifications. The difference is packaging format: 0034.1521.PT is supplied in Bulk, while 0034.1521.TR is supplied in Cut Tape (CT). Select based on your assembly and procurement workflow.

Q: Are there any regulatory compliance differences I should consider?

A: The 5SFP 3.15-R carries certifications from CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE. The SCHURTER alternatives carry cURus approval. The Littelfuse alternative carries BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE approvals. Confirm that your selected substitute meets all required certifications for your target market and application.

Q: Do the dimensional variations between parts affect PCB design?

A: The parts have minor dimensional variations within the 5mm x 20mm package classification. The 5SFP 3.15-R measures 5.50mm x 21.00mm, while SCHURTER parts measure 5.40mm x 22.50mm, and the Littelfuse part measures 5.80mm x 22.50mm. These tolerances are within standard through-hole fuse specifications and do not require PCB redesign.

Q: What does melting I²t indicate, and why do the values differ?

A: Melting I²t is a thermal characteristic indicating the energy required to melt the fuse element. The 5SFP 3.15-R has a melting I²t of 16, while substitutes range from 16.1 to 17.72. These minor variations remain within acceptable tolerance for fast-blow fuses at the 3.15 A rating and do not affect circuit protection performance in standard applications.