Equivalent & Substitute Parts for 5SF 315 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5SF 315 is a 315 mA, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor. This part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. The fuse requires a compatible holder for installation and is designed for circuit protection applications requiring fast response characteristics.

Key Parameters

Parameter	Value
Current Rating	315 mA
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility for the 5SF 315 is determined by strict equivalence across the following parameters:

Current Rating: 315 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Breaking Capacity: 35A (exact match required)

All substitute parts listed meet these criteria. Variations in secondary parameters such as melting I²t, DC cold resistance, and approval agencies do not disqualify substitution when primary electrical and mechanical parameters align.

Parameter Comparison

Manufacturer	Part Number	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity	Melting I²t	DC Cold Resistance	Product Status	RoHS Status
Bel Fuse Inc.	5SF 315	315 mA	250 V	Fast Blow	5mm x 20mm	35A	0.1	0.9 Ω	Obsolete	Non-compliant
SCHURTER Inc.	0034.1511	315 mA	250 V	Fast Blow	5mm x 20mm	35A	0.0367	—	Active	ROHS3 Compliant
Littelfuse Inc.	0217.315HXP	315 mA	250 V	Fast Blow	5mm x 20mm	35A	0.11	0.88 Ω	Active	ROHS3 Compliant
Littelfuse Inc.	0217.315MXBP	315 mA	250 V	Fast Blow	5mm x 20mm	35A	0.11	0.88 Ω	Active	ROHS3 Compliant
Littelfuse Inc.	0217.315MXP	315 mA	250 V	Fast Blow	5mm x 20mm	35A	0.11	0.88 Ω	Active	ROHS3 Compliant
Littelfuse Inc.	0217.315TXP	315 mA	250 V	Fast Blow	5mm x 20mm	35A	0.11	0.88 Ω	Active	ROHS3 Compliant
Littelfuse Inc.	0217.315VXP	315 mA	250 V	Fast Blow	5mm x 20mm	35A	0.11	0.88 Ω	Active	ROHS3 Compliant
Eaton - Electronics Division	GDB-315MA	315 mA	250 V	Fast Blow	5mm x 20mm	35A	0.58	3.1 Ω	Active	—
Eaton - Electronics Division	S500-315-R	315 mA	250 V	Fast Blow	5mm x 20mm	35A	0.58	3.1 Ω	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts meet the core electrical and mechanical requirements for direct replacement of the 5SF 315. Selection should prioritize active product status and regulatory compliance:

Littelfuse 217 Series (0217.315HXP, 0217.315MXBP, 0217.315MXP, 0217.315TXP, 0217.315VXP) offer the broadest approval agency coverage including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications. All variants are ROHS3 compliant and actively manufactured with substantial inventory availability.

SCHURTER 0034.1511 (FSF 5x20 series) provides an alternative with ROHS3 compliance and active status, supported by CCC, cURus, and VDE approvals.

Eaton S500-315-R combines active status with ROHS3 compliance and extensive approval coverage including BSI, CCC, CSA, cURus, IMQ, SEMKO, and VDE.

Eaton GDB-315MA is active and available but lacks RoHS documentation and has limited approval agency coverage (VDE, UR only).

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts be used interchangeably with the 5SF 315?

A: Yes. All listed parts share identical current rating (315 mA), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (35A). Physical and electrical compatibility is confirmed.

Q: What is the significance of the different melting I²t values?

A: Melting I²t represents the thermal energy required to melt the fuse element. While values vary across substitutes (0.0367 to 0.58), all parts maintain the same current rating and response time classification. The variation reflects different fuse element designs but does not affect substitution eligibility for applications designed around the 315 mA, fast-blow specification.

Q: Are there RoHS compliance considerations?

A: The original 5SF 315 is RoHS non-compliant. Most active substitutes (Littelfuse 217 series, SCHURTER 0034.1511, Eaton S500-315-R) are ROHS3 compliant. For new designs or systems with RoHS requirements, these compliant alternatives are preferred. Eaton GDB-315MA does not specify RoHS status.

Q: Do all substitutes require the same holder?

A: All parts are 5mm x 20mm cartridge fuses requiring a compatible holder. Verify holder compatibility with the specific fuse series, as holder designs may vary by manufacturer.

Q: Which substitute has the best approval agency coverage?

A: Littelfuse 217 series variants and Eaton S500-315-R offer the most comprehensive approvals. Littelfuse variants include CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. Eaton S500-315-R includes BSI, CCC, CSA, cURus, IMQ, SEMKO, and VDE.

Q: What is the difference between the various Littelfuse 217 part numbers?

A: All Littelfuse 217 variants (0217.315HXP, 0217.315MXBP, 0217.315MXP, 0217.315TXP, 0217.315VXP) share identical electrical specifications and approvals. Differences in suffix designations reflect packaging or internal manufacturing variants. All are electrically equivalent for substitution purposes.

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