5SF 3.15 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5SF 3.15 is a 3.15 A, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm package format, designed for use with appropriate fuse holders. This part is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to ensure continued component availability and system reliability in new designs and maintenance applications.

Key Parameters

Parameter	Value
Current Rating	3.15 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Fast Blow
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	16 to 17.72
Operating Temperature Range	-55°C to 125°C
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the 5SF 3.15 is determined by strict compliance with the following electrical and mechanical parameters:

Current Rating: 3.15 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Fast Blow (exact match required)
Breaking Capacity @ Rated Voltage: 35 A (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)

All substitute parts listed below meet these criteria and are sourced from active manufacturers with current product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status	Inventory (Pcs)
5SF 3.15	Bel Fuse Inc.	3.15	250	5mm x 20mm	Fast Blow	35	16	Obsolete	RoHS Non-Compliant	683
5SF 3.15-R	Bel Fuse Inc.	3.15	250	5mm x 20mm	Fast Blow	35	16	Active	ROHS3 Compliant	10008
0034.1521	SCHURTER Inc.	3.15	250	5mm x 20mm	Fast Blow	35	16.1	Active	ROHS3 Compliant	811
02173.15HXP	Littelfuse Inc.	3.15	250	5mm x 20mm	Fast Blow	35	17.72	Active	ROHS3 Compliant	3739
02173.15MXBP	Littelfuse	3.15	250	5mm x 20mm	Fast Blow	35	17.72	Active	ROHS3 Compliant	2241
02173.15MXP	Littelfuse Inc.	3.15	250	5mm x 20mm	Fast Blow	35	17.72	Active	ROHS3 Compliant	15900
02173.15TXP	Littelfuse Inc.	3.15	250	5mm x 20mm	Fast Blow	35	17.72	Active	ROHS3 Compliant	949
02173.15VXP	Littelfuse Inc.	3.15	250	5mm x 20mm	Fast Blow	35	17.72	Active	ROHS3 Compliant	905

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the 5SF 3.15 and meet the required electrical and mechanical specifications. Selection should be based on the following factors:

Product Status & Availability: The 5SF 3.15-R from Bel Fuse Inc. is the direct active-status replacement from the original manufacturer, with the highest inventory level (10,008 pcs) and ROHS3 compliance. This part is the primary recommendation for direct substitution.

Compliance & Certifications: All substitute parts carry ROHS3 compliance, addressing environmental and regulatory requirements. Littelfuse parts (02173.15HXP, 02173.15MXBP, 02173.15MXP, 02173.15TXP, 02173.15VXP) include expanded approval agencies (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE), providing broader international certification coverage. SCHURTER 0034.1521 carries CCC, cURus, PSE/JET, and VDE certifications.

Inventory & Supply Chain: Littelfuse 02173.15MXP offers the highest inventory availability (15,900 pcs) among substitute options, supporting high-volume applications. Bel Fuse 5SF 3.15-R provides strong availability (10,008 pcs) with manufacturer continuity.

Melting I²t Characteristics: The original 5SF 3.15 specifies 16 I²t. Substitute parts from Littelfuse (17.72 I²t) and SCHURTER (16.1 I²t) show minor variations within acceptable tolerance for fast-blow cartridge fuse applications. The 5SF 3.15-R maintains the original 16 I²t specification.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 5SF 3.15?

A: Yes. All listed substitute parts meet the required specifications: 3.15 A current rating, 250 V AC voltage rating, 5mm x 20mm package, fast-blow response, 35 A breaking capacity, and -55°C to 125°C operating temperature range. Physical and electrical compatibility is ensured.

Q: What is the difference between the 5SF 3.15 and 5SF 3.15-R?

A: The 5SF 3.15-R is the active-status successor from Bel Fuse Inc. Both parts are electrically and mechanically identical with matching 16 I²t specifications. The primary difference is product status: the original 5SF 3.15 is obsolete, while the 5SF 3.15-R is active with higher inventory availability and ROHS3 compliance.

Q: Why do Littelfuse parts show higher Melting I²t values (17.72 vs. 16)?

A: Melting I²t represents the thermal energy required to melt the fuse element. The variation between 16 and 17.72 I²t is within acceptable tolerance for fast-blow cartridge fuses and does not affect functional compatibility or circuit protection performance at the specified 3.15 A rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status. The original 5SF 3.15 is RoHS non-compliant, making the compliant substitutes necessary for applications subject to environmental and regulatory requirements.

Q: Which substitute part offers the best supply availability?

A: Littelfuse 02173.15MXP provides the highest inventory level at 15,900 pcs. For direct manufacturer continuity, Bel Fuse 5SF 3.15-R offers 10,008 pcs in stock.

Q: Do these parts require the same holder as the original 5SF 3.15?

A: Yes. All substitute parts are 5mm x 20mm cartridge fuses requiring a holder. They are mechanically compatible with any standard 5mm x 20mm fuse holder designed for the original part.

Q: What certifications do these substitute parts carry?

A: Littelfuse parts carry BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE certifications. SCHURTER 0034.1521 carries CCC, cURus, PSE/JET, and VDE certifications. Bel Fuse 5SF 3.15-R carries CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE certifications. All parts meet international safety and performance standards.

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