It provides superb insulation effectiveness even in areas weakened by salt or air pollution with its anti-pollution design.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 three v? trí I - O - II– ?i?u ch?nh th?i gian chuy?n m?ch tr?c ti?p trên