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S520 Fast-Acting Ceramic Tube Fuses

Eaton Electronics S520 Fast-Acting Ceramic Tube Fuses provide reliable overcurrent protection up to 20A and 420V_AC for high power and higher voltage applications, respectively. Typical applications include data centers, telecom systems, and intelligent commercial buildings. The S520 fuses are available in a compact small-footprint 5mm x 20mm cartridge or axial leaded packages, providing excellent board savings. These fuses can withstand operating temperatures ranging from -55°C to +125°C, making them suitable for use in various environments. All products are lead-free, halogen-free, and RoHS compliant.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (PEN) Filter the results in the table by unit price based on your quantity.	Qty.	Series	Product	Current Rating	Fuse Type	Fuse Size / Group	Voltage Rating AC	Interrupt Rating	Mounting Style	Termination Style	Minimum Operating Temperature	Maximum Operating Temperature	Packaging	Resistance
Cartridge Fuses 12.5A 420V FAST ACTING BK-S520-V-12-5-R Eaton Electronics 1: S/ 19.54 448In Stock	Mfr. Part # BK-S520-V-12-5-R Mouser Part # 504-BK-S520-V-12-5-R	Eaton Electronics	Cartridge Fuses 12.5A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	448In Stock	S/ 19.54 S/ 16.82 S/ 13.62 S/ 12.69 View S/ 12.07 S/ 10.39 S/ 10.00 S/ 9.26	Min.: 1 Mult.: 1	S520	Ceramic Fuses	12.5 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	8.1 mOhms
Cartridge Fuses 15A 420V FAST ACTING BK-S520-15-R Eaton Electronics 1: S/ 22.62 11In Stock	Mfr. Part # BK-S520-15-R Mouser Part # 504-BK-S520-15-R	Eaton Electronics	Cartridge Fuses 15A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	11In Stock	S/ 22.62 S/ 20.79 S/ 19.66 S/ 15.69 View S/ 14.13 S/ 13.31 S/ 12.14	Min.: 1 Mult.: 1	S520	Ceramic Fuses	15 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	6.8 mOhms
Cartridge Fuses 16A 420V FAST ACTING BK-S520-16-R Eaton Electronics 1: S/ 29.62 78In Stock	Mfr. Part # BK-S520-16-R Mouser Part # 504-BK-S520-16-R	Eaton Electronics	Cartridge Fuses 16A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	78In Stock	S/ 29.62 S/ 26.62 S/ 23.74 S/ 19.54 View S/ 15.65 S/ 13.74 S/ 12.92 S/ 12.14	Min.: 1 Mult.: 1	S520	Ceramic Fuses	16 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	6.1 mOhms
Cartridge Fuses 8A 420V FAST ACTING BK-S520-8-R Eaton Electronics 1: S/ 17.94 198In Stock	Mfr. Part # BK-S520-8-R Mouser Part # 504-BK-S520-8-R	Eaton Electronics	Cartridge Fuses 8A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	198In Stock	S/ 17.94 S/ 14.91 S/ 13.74 S/ 13.70 View S/ 12.57 S/ 12.14	Min.: 1 Mult.: 1	S520	Ceramic Fuses	8 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	9 mOhms
Cartridge Fuses 10A 420V FAST ACTING BK-S520-V-10-R Eaton Electronics 1: S/ 21.68 166In Stock	Mfr. Part # BK-S520-V-10-R Mouser Part # 504-BK-S520-V-10-R	Eaton Electronics	Cartridge Fuses 10A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	166In Stock	S/ 21.68 S/ 17.98 S/ 16.62 S/ 16.54 View S/ 15.22 S/ 12.42	Min.: 1 Mult.: 1	S520	Ceramic Fuses	10 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	8 mOhms
Cartridge Fuses 15A 420V FAST ACTING BK-S520-V-15-R Eaton Electronics 1: S/ 22.30 128In Stock	Mfr. Part # BK-S520-V-15-R Mouser Part # 504-BK-S520-V-15-R	Eaton Electronics	Cartridge Fuses 15A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	128In Stock	S/ 22.30 S/ 21.41 S/ 17.87 S/ 16.08 View S/ 14.01 S/ 13.20 S/ 12.42	Min.: 1 Mult.: 1	S520	Ceramic Fuses	15 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	6.8 mOhms
Cartridge Fuses 8A 420V FAST ACTING BK-S520-V-8-R Eaton Electronics 1: S/ 23.12 1In Stock	Mfr. Part # BK-S520-V-8-R Mouser Part # 504-BK-S520-V-8-R	Eaton Electronics	Cartridge Fuses 8A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	1In Stock	S/ 23.12 S/ 21.25 S/ 17.36 S/ 16.00 View S/ 14.01 S/ 13.27 S/ 13.20 S/ 12.42	Min.: 1 Mult.: 1	S520	Ceramic Fuses	8 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	9 mOhms
Cartridge Fuses S520 420Vac, 12.5A, bulk BK/S520-12-5-R Eaton Electronics 1: S/ 28.30 1In Stock	Mfr. Part # BK/S520-12-5-R Mouser Part # 504-BK/S520-12-5-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 12.5A, bulk Learn More about Eaton Electronics eaton s520	Datasheet	1In Stock	S/ 28.30 S/ 25.22 S/ 25.11 S/ 17.79 View S/ 15.18 S/ 14.13 S/ 13.51	Min.: 1 Mult.: 1	S520	Ceramic Fuses	12.5 A		5 mm x 20 mm							Bulk
Cartridge Fuses 10A 420V FAST ACTING BK-S520-10-R Eaton Electronics 1: S/ 22.62 200On Order	Mfr. Part # BK-S520-10-R Mouser Part # 504-BK-S520-10-R	Eaton Electronics	Cartridge Fuses 10A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	200On Order	S/ 22.62 S/ 20.79 S/ 20.47 S/ 17.01 View S/ 15.65 S/ 13.74 S/ 12.92 S/ 12.14	Min.: 1 Mult.: 1	S520	Ceramic Fuses	10 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	8 mOhms
Cartridge Fuses 20A 420V FAST ACTING BK-S520-20-R Eaton Electronics 1: S/ 23.98 172On Order	Mfr. Part # BK-S520-20-R Mouser Part # 504-BK-S520-20-R	Eaton Electronics	Cartridge Fuses 20A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	172On Order On Order Ship Dates Mfr. #: BK-S520-20-R Stock: 0 On Order: 100 Pending 72 Expected 11/4/2026 Factory Lead-Time: 12 Weeks	S/ 23.98 S/ 19.93 S/ 18.37 S/ 15.26 View S/ 14.01 S/ 12.34	Min.: 1 Mult.: 1	S520	Ceramic Fuses	20 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	5 mOhms
Cartridge Fuses S520 420Vac, 10A, standard S520-10-R Eaton Electronics 1: S/ 46.48 105On Order	Mfr. Part # S520-10-R Mouser Part # 504-S520-10-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 10A, standard Learn More about Eaton Electronics eaton s520	Datasheet	105On Order	S/ 46.48 S/ 28.45 S/ 25.53 S/ 22.54 S/ 22.19	Min.: 1 Mult.: 1	S520	Ceramic Fuses	10 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	8 mOhms
Cartridge Fuses S520 420Vac, 16A, standard S520-16-R Eaton Electronics 1: S/ 46.48 250Expected 12/23/2026	Mfr. Part # S520-16-R Mouser Part # 504-S520-16-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 16A, standard Learn More about Eaton Electronics eaton s520	Datasheet	250Expected 12/23/2026	S/ 46.48 S/ 28.22 S/ 25.42 S/ 22.54 S/ 22.19	Min.: 1 Mult.: 1	S520	Ceramic Fuses	16 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	6.1 mOhms
Cartridge Fuses 16A 420V FAST ACTING BK-S520-V-16-R Eaton Electronics 1: S/ 14.40 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # BK-S520-V-16-R Mouser Part # 504-BK-S520-V-16-R	Eaton Electronics	Cartridge Fuses 16A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 14.40 S/ 13.86 S/ 12.42	Min.: 1 Mult.: 1	S520	Ceramic Fuses	16 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	6.1 mOhms
Cartridge Fuses 20A 420V FAST ACTING BK-S520-V-20-R Eaton Electronics 1: S/ 26.74 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # BK-S520-V-20-R Mouser Part # 504-BK-S520-V-20-R	Eaton Electronics	Cartridge Fuses 20A 420V FAST ACTING Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 26.74 S/ 22.65 S/ 20.90 S/ 17.36 View S/ 15.84 S/ 14.01 S/ 13.20	Min.: 1 Mult.: 1	S520	Ceramic Fuses	20 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	5 mOhms
Cartridge Fuses S520 420Vac, 10A, BK1 BK1-S520-10-R Eaton Electronics 1,000: S/ 12.30 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # BK1-S520-10-R Mouser Part # 504-BK1-S520-10-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 10A, BK1 Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 12.30	Min.: 1,000 Mult.: 1,000	S520	Ceramic Fuses	10 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	8 mOhms
Cartridge Fuses S520 420Vac, 12.5A, BK1 BK1-S520-12-5-R Eaton Electronics 1,000: S/ 12.30 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # BK1-S520-12-5-R Mouser Part # 504-BK1-S520-12-5-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 12.5A, BK1 Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 12.30	Min.: 1,000 Mult.: 1,000	S520	Ceramic Fuses	12.5 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	8.1 mOhms
Cartridge Fuses S520 420Vac, 15A, BK1 BK1-S520-15-R Eaton Electronics 1,000: S/ 12.30 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # BK1-S520-15-R Mouser Part # 504-BK1-S520-15-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 15A, BK1 Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 12.30	Min.: 1,000 Mult.: 1,000	S520	Ceramic Fuses	15 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	6.8 mOhms
Cartridge Fuses S520 420Vac, 16A, BK1 BK1-S520-16-R Eaton Electronics 1,000: S/ 13.23 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # BK1-S520-16-R Mouser Part # 504-BK1-S520-16-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 16A, BK1 Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 13.23	Min.: 1,000 Mult.: 1,000	S520	Ceramic Fuses	16 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	6.1 mOhms
Cartridge Fuses S520 420Vac, 20A, BK1 BK1-S520-20-R Eaton Electronics 1,000: S/ 12.30 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # BK1-S520-20-R Mouser Part # 504-BK1-S520-20-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 20A, BK1 Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 12.30	Min.: 1,000 Mult.: 1,000	S520	Ceramic Fuses	20 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	5 mOhms
Cartridge Fuses S520 420Vac, 8A, BK1 BK1-S520-8-R Eaton Electronics 1,000: S/ 12.30 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # BK1-S520-8-R Mouser Part # 504-BK1-S520-8-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 8A, BK1 Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 12.30	Min.: 1,000 Mult.: 1,000	S520	Ceramic Fuses	8 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	9 mOhms
Cartridge Fuses S520 420Vac, 12.5A, standard S520-12-5-R Eaton Electronics 1: S/ 46.48 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # S520-12-5-R Mouser Part # 504-S520-12-5-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 12.5A, standard Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 46.48 S/ 30.17 S/ 27.25 S/ 24.25 View S/ 22.54 S/ 22.19	Min.: 1 Mult.: 1	S520	Ceramic Fuses	10 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	8.1 mOhms
Cartridge Fuses S520 420Vac, 15A, standard S520-15-R Eaton Electronics 1: S/ 46.48 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # S520-15-R Mouser Part # 504-S520-15-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 15A, standard Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 46.48 S/ 34.29 S/ 27.33 S/ 26.24 View S/ 25.34 S/ 24.52 S/ 23.74 S/ 23.08 Quote	Min.: 1 Mult.: 1	S520	Ceramic Fuses	15 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	6.8 mOhms
Cartridge Fuses S520 420Vac, 20A, standard S520-20-R Eaton Electronics 1: S/ 46.48 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # S520-20-R Mouser Part # 504-S520-20-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 20A, standard Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 46.48 S/ 30.87 S/ 28.06 S/ 25.18 View S/ 23.47 S/ 22.58 S/ 22.19	Min.: 1 Mult.: 1	S520	Ceramic Fuses	20 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	5 mOhms
Cartridge Fuses S520 420Vac, 8A, standard S520-8-R Eaton Electronics 1: S/ 46.48 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # S520-8-R Mouser Part # 504-S520-8-R	Eaton Electronics	Cartridge Fuses S520 420Vac, 8A, standard Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	S/ 46.48 S/ 37.02 S/ 34.99 S/ 32.15 View S/ 30.48 S/ 29.54 S/ 28.77 S/ 28.14 Quote	Min.: 1 Mult.: 1	S520	Ceramic Fuses	8 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Bulk	9 mOhms
Cartridge Fuses S520 axial 420Vac, 10A, tape and reel TR2-S520-V-10-R Eaton Electronics 1,500: S/ 12.65 Non-Stocked Lead-Time 12 Weeks	Mfr. Part # TR2-S520-V-10-R Mouser Part # 504-TR2-S520-V-10-R	Eaton Electronics	Cartridge Fuses S520 axial 420Vac, 10A, tape and reel Learn More about Eaton Electronics eaton s520	Datasheet	Non-Stocked Lead-Time 12 Weeks	Reel S/ 12.65	Min.: 1,500 Mult.: 1,500 : 1,500	S520	Ceramic Fuses	10 A	Fast Blow	5 mm x 20 mm	420 VAC	1.5 kA	Board Mount	Axial	- 55 C	+ 125 C	Reel	8 mOhms

S520 Fast-Acting Ceramic Tube Fuses

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S520 Fast-Acting Ceramic Tube Fuses

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