Container made of stainless steel plate. Polypropylene film is treated with double side rough processing for easy impregnation. Polar plate is made of ultra thin aluminium foil. Internal fuses protects the capacitor in case of breakdown or failure. Conforming Standard: IEC 60871 Capacitance tolerance : -3%~+5% Frequency: 50/60 Hz Running no longer than 8 hours out of every 24 hours under 1.1 times of Un. Running under stable over current, highest value of which reaching 1.3 times of In, caused by over voltage and high harmonic. As for capacitor with max positive deviation, the value of stable over current can be as 1.43 times high of In.