It provides excellent insulation functionality even in locations destroyed by salt or air pollution with its anti-air pollution structure.S? d?ng cho h? th?ng ?i?n h? th? khi ngu?n c?p ph? t?i b? gián ?o?n B? chuy?n m?ch t? ??ng, giám sát và chuy?n ??i gi?a hai ngu?n ?i?n Chuy?n m?ch 3 v? trí I - O - II– ?i?u ch?nh th?i gian chuy?n m?ch tr?c