S500-100-R Equivalent & Substitute Parts

Part Overview

The S500-100-R is a 100 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division in a 5mm x 20mm package. This fuse requires a holder for installation and is designed for circuit protection applications requiring rapid response to overcurrent conditions. The part is active in production with 783 pieces currently in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional characteristics to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	100 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the S500-100-R is determined by the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 100 mA
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Glass
Response Time: Fast Blow
Package / Case: 5mm x 20mm
Mounting Type: Requires Holder

All identified substitute parts match these mandatory parameters, ensuring mechanical and electrical interchangeability. Variations in secondary parameters such as melting I²t, DC cold resistance, breaking capacity, and approval agencies do not prevent substitution but may affect performance characteristics in specific applications. Parts are grouped by manufacturer and series designation while maintaining full compliance with the core electrical and mechanical specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (Amps)	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	RoHS Status	Inventory (Pcs)
S500-100-R	Eaton - Electronics Division	S500	100 mA	250 V	Fast Blow	5mm x 20mm	35A	0.003	3.8	ROHS3 Compliant	783
BK/GMA-100-R	Eaton - Electronics Division	GMA	100 mA	250 V	Fast Blow	5mm x 20mm	35A	0.0001	7.84	ROHS3 Compliant	1321
BK/S500-100-R	Eaton - Electronics Division	S500	100 mA	250 V	Fast Blow	5mm x 20mm	35A	0.003	3.8	ROHS3 Compliant	1043
BK1/S500-100-R	Eaton - Electronics Division	S500	100 mA	250 V	Fast Blow	5mm x 20mm	35A	0.003	3.8	RoHS Compliant	1825
0217.100MXP	Littelfuse Inc.	217	100 mA	250 V	Fast Blow	5mm x 20mm	35A	0.0045	5.6965	ROHS3 Compliant	5500
0034.1506	SCHURTER Inc.	FSF 5x20	100 mA	250 V	Fast Blow	5mm x 20mm	35A	0.0014	Not Specified	ROHS3 Compliant	888
0217.100HXP	Littelfuse Inc.	217	100 mA	250 V	Fast Blow	5mm x 20mm	35A	0.0045	5.6965	ROHS3 Compliant	3017
0235.100HXP	Littelfuse Inc.	235	100 mA	250 V	Fast Blow	5mm x 20mm	35A	0.00312	8.4	ROHS3 Compliant	999
0235.100MXP	Littelfuse Inc.	235	100 mA	250 V	Fast Blow	5mm x 20mm	35A	0.00312	8.4	ROHS3 Compliant	1475
FSC-100MA	OptiFuse	FSC	100 mA	250 V	Fast Blow	5mm x 20mm	100A	Not Specified	Not Specified	ROHS3 Compliant	2381

Engineering Selection Recommendations

Eaton - Electronics Division Parts (Same Manufacturer): BK/S500-100-R, BK1/S500-100-R, and BK/GMA-100-R are direct alternatives from the original manufacturer. BK/S500-100-R and BK1/S500-100-R maintain identical electrical characteristics to the S500-100-R with higher inventory availability. BK/GMA-100-R offers an alternative series designation with different melting I²t characteristics while maintaining all core electrical parameters.

Littelfuse Inc. Parts (Multi-Series Availability): 0217.100HXP, 0217.100MXP, 0235.100HXP, and 0235.100MXP are qualified alternatives with comprehensive international approval certifications including UL, CSA, CE, and VDE. These parts feature extended operating temperature ranges (-55°C to 125°C) and are available in higher quantities. The 217 series parts (0217.100HXP and 0217.100MXP) are functionally identical with 5500 and 3017 pieces in stock respectively.

SCHURTER Inc. Part (FSF 5x20 Series): 0034.1506 is a parametric equivalent with CSA, cURus, and VDE certifications. This part features the lowest melting I²t value (0.0014) among all substitutes and extended operating temperature range (-55°C to 125°C).

OptiFuse Part (FSC Series): FSC-100MA is a parametric equivalent with cULus and UL 248 certifications. This part features a higher breaking capacity of 100A at rated voltage and an operating temperature range of -55°C to 90°C.

All substitute parts are active in production and ROHS3 compliant. Selection should be based on availability, required certifications for the target application, and specific performance characteristics needed for the circuit protection function.

Frequently Asked Questions (FAQ)

Q: Can BK/S500-100-R be used as a direct replacement for S500-100-R?

A: Yes. BK/S500-100-R is a parametric equivalent manufactured by Eaton - Electronics Division with identical current rating (100 mA), voltage rating (250 V), response time (fast blow), and package dimensions (5mm x 20mm). Both parts require a holder for installation and are ROHS3 compliant.

Q: What is the difference between the Littelfuse 217 series (0217.100HXP, 0217.100MXP) and 235 series (0235.100HXP, 0235.100MXP)?

A: Both series match the mandatory electrical and mechanical parameters of the S500-100-R. The primary differences are melting I²t values (0.0045 for 217 series versus 0.00312 for 235 series) and DC cold resistance (5.6965 Ohms for 217 series versus 8.4 Ohms for 235 series). Both series feature identical current ratings, voltage ratings, response times, and package dimensions.

Q: Are there any approval agency differences between substitute parts?

A: Yes. The S500-100-R lists no approval agencies. Littelfuse parts (0217 and 0235 series) carry multiple certifications including UL, CSA, CE, VDE, and others. SCHURTER 0034.1506 carries CSA, cURus, and VDE certifications. OptiFuse FSC-100MA carries cULus and UL 248 certifications. Selection should consider application-specific certification requirements.

Q: Can FSC-100MA from OptiFuse be used as a substitute?

A: Yes. FSC-100MA matches all mandatory parameters: 100 mA current rating, 250 V voltage rating, fast-blow response, and 5mm x 20mm package. The part features a higher breaking capacity (100A versus 35A) and cULus/UL 248 certifications. Operating temperature range is -55°C to 90°C.

Q: What is the significance of melting I²t values in fuse selection?

A: Melting I²t is a thermal characteristic that affects fuse response behavior. The S500-100-R has a melting I²t of 0.003. Substitute parts range from 0.0001 (BK/GMA-100-R) to 0.0045 (Littelfuse 217 series). These variations do not prevent substitution but reflect different thermal response profiles within the fast-blow classification.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are supplied in bulk packaging and require a holder for installation, matching the S500-100-R mounting requirements. All parts are housed in 5mm x 20mm glass cartridge format.

Q: Which substitute part has the highest inventory availability?

A: 0217.100MXP from Littelfuse Inc. has the highest inventory with 5500 pieces in stock, followed by FSC-100MA from OptiFuse with 2381 pieces.

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