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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 (CLP) 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: $5.161 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	$5.161 $4.523 $3.760 $3.577 View $3.566 $3.042 $2.928 $2.711	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: $6.619 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	$6.619 $6.084 $5.753 $4.591 View $4.136 $3.896 $3.555	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: $8.670 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	$8.670 $7.793 $6.950 $5.719 View $4.580 $4.022 $3.782 $3.555	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-S520-20-R Eaton Electronics 1: $7.018 72In Stock 100On 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	72In Stock 100On Order	$7.018 $5.833 $5.377 $4.466 View $4.101 $3.612	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 8A 420V FAST ACTING BK-S520-8-R Eaton Electronics 1: $5.252 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	$5.252 $4.363 $4.022 $4.010 View $3.680 $3.555	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: $6.346 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	$6.346 $5.263 $4.865 $4.842 View $4.455 $3.634	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: $6.528 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	$6.528 $6.266 $5.229 $4.705 View $4.101 $3.862 $3.634	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: $6.767 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	$6.767 $6.220 $5.081 $4.682 View $4.101 $3.885 $3.862 $3.634	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: $8.283 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	$8.283 $7.383 $7.348 $5.206 View $4.443 $4.136 $3.953	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: $6.619 200Expected 11/16/2026	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	200Expected 11/16/2026	$6.619 $6.084 $5.993 $4.979 View $4.580 $4.022 $3.782 $3.555	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, 10A, standard S520-10-R Eaton Electronics 1: $13.603 105In Stock	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	105In Stock	$13.603 $8.328 $7.474 $6.596 $6.494	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: $13.603 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	$13.603 $8.260 $7.439 $6.596 $6.494	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: $4.215 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	$4.215 $4.056 $3.634	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: $7.827 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	$7.827 $6.631 $6.118 $5.081 View $4.637 $4.101 $3.862	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: $3.600 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	$3.600	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: $3.600 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	$3.600	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: $3.600 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	$3.600	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: $3.874 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	$3.874	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: $3.600 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	$3.600	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: $3.600 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	$3.600	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: $13.603 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	$13.603 $8.829 $7.975 $7.098 View $6.596 $6.494	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: $13.603 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	$13.603 $10.037 $7.998 $7.679 View $7.417 $7.177 $6.950 $6.756 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: $13.603 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	$13.603 $9.034 $8.214 $7.371 View $6.870 $6.608 $6.494	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: $13.603 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	$13.603 $10.835 $10.242 $9.410 View $8.921 $8.647 $8.419 $8.237 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: $3.703 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 $3.703	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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