Brand new and economical price intelligent automatic transfer switch, with rated operating current 250A, 315A, 350A, 400A, 500A, 630A for your choice, adjustable 0~30s delay time and rated working voltage 400V AC 50Hz. With automatic and manual operation, ATS comes with microcomputer controller, easy to use and wiring, safe and reliable to transfer between two power sources in many critical areas like hospitals, banks, airports and so on.