Bel Fuse Inc. 5SF 5 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5SF 5 is a 5 A, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor, designed for use with compatible fuse holders. This part is classified as obsolete. Equivalent and substitute parts from active manufacturers are available to maintain circuit protection functionality in applications requiring 5 A rated fuses with identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	5 A
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	50 A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (5 A), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm), fuse type (cartridge glass), and breaking capacity (50 A). All listed substitute parts meet these criteria and are compatible with holders designed for 5mm x 20mm glass cartridge fuses.

The substitute parts are categorized as follows:

Direct Substitutes (Bel Fuse Inc. 5SF Series): 5SF 5-R maintains identical electrical and mechanical specifications with active product status and improved RoHS3 compliance.

Cross-Manufacturer Equivalents (Active Status): Parts from Littelfuse Inc. (217 series), SCHURTER Inc. (FSF 5x20 series), and Eaton Electronics Division (S500 and GDB series) provide functional equivalence with all critical parameters matched.

Parameter Comparison

Manufacturer	Part Number	Current Rating (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
Bel Fuse Inc.	5SF 5	5	250	Fast Blow	5mm x 20mm	50	41	Obsolete	Non-compliant
Bel Fuse Inc.	5SF 5-R	5	250	Fast Blow	5mm x 20mm	50	41	Active	ROHS3 Compliant
Littelfuse Inc.	0217005.MXBP	5	250	Fast Blow	5mm x 20mm	50	42.795	Active	ROHS3 Compliant
Littelfuse Inc.	0217005.MXP	5	250	Fast Blow	5mm x 20mm	50	42.795	Active	ROHS3 Compliant
Littelfuse Inc.	0217005.TXP	5	250	Fast Blow	5mm x 20mm	50	42.795	Active	ROHS3 Compliant
Littelfuse Inc.	0217005.VXP	5	250	Fast Blow	5mm x 20mm	50	42.795	Active	ROHS3 Compliant
Littelfuse Inc.	0217005.HXP	5	250	Fast Blow	5mm x 20mm	50	42.795	Active	ROHS3 Compliant
SCHURTER Inc.	0034.1523	5	250	Fast Blow	5mm x 20mm	50	33.8	Active	ROHS3 Compliant
Eaton - Electronics Division	BK1/S500-5-R	5	250	Fast Blow	5mm x 20mm	50	42	Active	ROHS3 Compliant
Eaton - Electronics Division	S500-5-R	5	250	Fast Blow	5mm x 20mm	50	42	Active	ROHS3 Compliant
Eaton - Electronics Division	GDB-5A	5	250	Fast Blow	5mm x 20mm	50	42	Active	Not specified

Engineering Selection Recommendations

For new designs and production applications, select from parts with active product status and ROHS3 compliance. The Bel Fuse Inc. 5SF 5-R provides direct compatibility with the obsolete 5SF 5 while meeting current regulatory requirements. Littelfuse Inc. 217 series parts (0217005.MXBP, 0217005.MXP, 0217005.TXP, 0217005.VXP, 0217005.HXP) offer broad international certification coverage including BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. SCHURTER Inc. 0034.1523 and Eaton Electronics Division S500 and GDB series parts provide alternative sourcing with equivalent electrical performance. All listed substitutes maintain the 50 A breaking capacity and fast-blow response characteristic required for circuit protection in the specified voltage and current range.

Frequently Asked Questions (FAQ)

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

A: Yes. All listed substitute parts share identical current rating (5 A), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (50 A). They are mechanically and electrically compatible with any holder designed for 5mm x 20mm glass cartridge fuses.

Q: What is the difference between the various Littelfuse 0217005 variants?

A: The 0217005.MXBP, 0217005.MXP, 0217005.TXP, 0217005.VXP, and 0217005.HXP variants are all from the Littelfuse 217 series with identical electrical specifications (5 A, 250 V, fast blow, 5mm x 20mm). Differences relate to packaging, certification combinations, and inventory availability. All meet ROHS3 compliance and carry equivalent melting I²t values (42.795).

Q: Why is the SCHURTER 0034.1523 listed if its melting I²t differs from others?

A: The SCHURTER 0034.1523 has a melting I²t of 33.8 compared to 41-42.795 for other substitutes. Despite this variation, it meets all other critical parameters: 5 A current rating, 250 V voltage rating, fast-blow response, 5mm x 20mm package, and 50 A breaking capacity. This part remains functionally equivalent for applications where the fuse holder and circuit design accommodate this characteristic.

Q: Are there compliance or certification differences I should consider?

A: All substitute parts carry international certifications appropriate for their respective manufacturers. Littelfuse parts include BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE approvals. Eaton parts include BSI, CCC, cURus, IMQ, PSE, SEMKO, and VDE. SCHURTER includes CCC, cURus, PSE/JET, and VDE. Select based on the specific regulatory requirements of your target market.

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

A: The 5SF 5-R is the active production equivalent of the obsolete 5SF 5. Both are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications. The 5SF 5-R carries ROHS3 compliance and significantly higher inventory availability (18,751 units vs. 709 units for the obsolete version).

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