MLQ2-63/4P CB level Automatic Transfer Switch (ATSE), rated current 63A, for 3-phase 4-wire AC400V power distribution system. It automatically switches load between normal power and standby power supply. When normal power has power failure, undervoltage or phase loss, the switch transfers load to standby power automatically. It switches back once main power recovers. Equipped with manual operating handle for manual switching and circuit isolation during maintenance. Housing available in grey and white.