Ceramic Fuse - TOOGOO(R) 10Pcs 250V 0.5A 500mA Fast Blow Ceramic Fuses Tubes 5mm x 20mm Designed with 5 x 20mm ceramic tube, 500mA breaking current. Widely used in power supply, switching power supplies, computers, chargers, telephones, household appliances, communication products, all kinds of instruments and electronic components, electrical products, is indispensable in electrical products safety accessories.