5SF 100-R Glass Cartridge Fuse 100mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The 5SF 100-R is a glass cartridge fuse manufactured by Bel Fuse Inc., rated for 100 mA at 250 V AC/DC with fast-blow response characteristics. The fuse is housed in a 5mm x 20mm cylindrical glass body and requires a compatible holder for installation. This part carries an obsolete product status, making identification of active equivalent and substitute components essential for ongoing system support and procurement.

Substitute parts must maintain identical electrical ratings (100 mA, 250 V AC/DC), mechanical dimensions (5mm x 20mm), fast-blow response time, and cartridge glass construction with holder requirement to ensure functional compatibility in existing circuit designs.

Key Parameters

Parameter	Specification
Current Rating	100 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Fast Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Mandatory Matching Criteria:

Current Rating: 100 mA (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)
Mounting Type: Requires Holder (exact match required)
Breaking Capacity @ Rated Voltage: 35A (exact match required)

Secondary Compatibility Factors:

Operating Temperature Range: -55°C ~ 125°C (all substitutes meet or exceed this range)
RoHS Compliance: ROHS3 Compliant (all substitutes maintain compliance)
Melting I²t: Variations within 0.003 to 0.0045 are acceptable for fast-blow cartridge fuses of this rating
DC Cold Resistance: Variations from 3.8 to 5.6965 Ohms are acceptable within fast-blow fuse design tolerances

All substitute parts listed below satisfy these mandatory criteria and are therefore electrically and mechanically interchangeable with the 5SF 100-R.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Fuse Type	Package / Case	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	Inventory (Pcs)
5SF 100-R	Bel Fuse Inc.	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.005	4.9	Obsolete	999
0034.1506	SCHURTER Inc.	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.0014	—	Active	888
0217.100MXBP	Littelfuse Inc.	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.0045	5.6965	Active	1076
0217.100MXP	Littelfuse Inc.	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.0045	5.6965	Active	5500
0217.100TXP	Littelfuse Inc.	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.0045	5.6965	Active	820
0217.100VXP	Littelfuse Inc.	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.0045	5.6965	Active	1105
0217.100HXP	Littelfuse Inc.	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.0045	5.6965	Active	3017
BK/S500-100-R	Eaton - Electronics Division	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.003	3.8	Active	1043
BK1/S500-100-R	Eaton - Electronics Division	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.003	3.8	Active	1825
GDB-100MA	Eaton - Electronics Division	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.003	3.8	Active	851
S500-100-R	Eaton - Electronics Division	100	250	Cartridge, Glass	5mm x 20mm	Fast Blow	35	0.003	3.8	Active	783

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the 5SF 100-R and are suitable for direct replacement in applications requiring a 100 mA, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor.

Active Status Substitutes (Recommended for New Procurement):

Littelfuse 217 Series (0217.100MXBP, 0217.100MXP, 0217.100TXP, 0217.100VXP, 0217.100HXP) and Eaton S500 Series (BK/S500-100-R, BK1/S500-100-R, GDB-100MA, S500-100-R) components carry active product status and are currently manufactured. These parts maintain full compliance with CCC, CE, CSA, UL, VDE, and SEMKO certifications as specified in their respective datasheets.

SCHURTER 0034.1506:

The SCHURTER FSF 5x20 series part 0034.1506 is an active substitute with CCC, cURus, and VDE certifications. This part provides an alternative sourcing option with confirmed inventory availability.

Inventory Availability:

Littelfuse 0217.100MXP offers the highest inventory level (5500 pcs), followed by Littelfuse 0217.100HXP (3017 pcs). Eaton BK1/S500-100-R provides 1825 pcs. All listed substitutes maintain sufficient stock for production and replacement applications.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 5SF 100-R?

A: Yes. All listed substitute parts match the mandatory electrical and mechanical parameters: 100 mA current rating, 250 V AC voltage rating, fast-blow response, cartridge glass construction, 5mm x 20mm dimensions, and 35A breaking capacity. Direct substitution is supported without circuit modification.

Q: What is the difference between Littelfuse 0217.100MXP and 0217.100HXP?

A: Both parts are Littelfuse 217 Series components with identical electrical ratings, voltage, current, response time, and breaking capacity. The suffix designations (MXP vs. HXP) reflect internal design variations within the Littelfuse product line. Both are functionally equivalent for this application.

Q: Why do Eaton S500 series fuses show lower melting I²t values (0.003) compared to Littelfuse parts (0.0045)?

A: Melting I²t variation within the 0.003 to 0.0045 range is acceptable for fast-blow cartridge fuses of this rating class. Both values fall within the design tolerance for 100 mA fast-blow fuses and do not affect functional compatibility or circuit protection performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the environmental compliance status of the original 5SF 100-R.

Q: Which substitute part should I select for new designs?

A: Selection should be based on availability, certification requirements for your application, and supplier preference. Littelfuse 0217.100MXP and 0217.100HXP offer high inventory levels and comprehensive international certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). Eaton S500 series parts provide alternative sourcing with active product status.

Q: Do these fuses require a specific holder type?

A: All parts listed are cartridge glass fuses requiring a compatible 5mm x 20mm fuse holder. Verify that your existing fuse holder accommodates the 5mm x 20mm form factor. Holder compatibility is independent of fuse manufacturer.

Q: What is the operating temperature range for these substitute parts?

A: All substitute parts operate across the -55°C to 125°C temperature range, matching the original 5SF 100-R specification.

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