TSMQ6 Double power automatic changeover switch is suitable in terminal type double-circuit power supply system with 50Hz/60Hz, rated working voltage 220V(2P), 380V(3P, 4P), rated current 10A~63A. Automatic switching between common power supply and standby power supply can be completed to prove the reliability of power supply. The item are widely used in high-rise buildings, shopping malls, fire pumps, smoke elimination fans, elevators, life pumps, emergency lighting and so on