- A controller from the switch for precise synchronous calculation from the microprocessor is necessary for overlap switching among the industrial electric power offer as well as standby electric power offer.B? chuy?n ??i ngu?n ATS Osung ???c s?n xu?t b?i th??ng Hello?u Osung ??n t? Hàn Qu?c nay th??ng hi?u OSUNG ???c chuy?n ??i thành th??ng He