For emergency power in buildings, auto transfer system is essential. ats can automatically transfer load from man power to emergency power without operator\'s operation. when the main power fails or voltage drop below 80% of normal voltage, the ats will start emergency generator set after a preset time from 0 to 10 seconds. at rated speed, the ats will transfer load toemergency power with available from 40a to 4000a. there is a swt ats that can meet every project\'s need.