① Common power indicator
This indicator is on when the common supply voltage is normal;

② Standby power indicator
This indicator lights up when the standby power supply voltage is normal;

③ Common power supply closure indicator
This indicator is on when the switch is in a common power position;

④ Standby power-off indicator
This indicator is on when the switch is in the standby power position;

⑤ Automatic / manual rotation mode selection switch
When the control switch is in the upper position, it is automatic switching mode, and at the bottom it is manual switching mode;

⑥ Conversion delay time setting potentiometer (commonly used power conversion and return delay time)
When the switch is in the closed position of the common power supply, if the common power supply fails and the standby power supply is normal, the controller starts timing (the timing time is set by the conversion delay potentiometer), and when the timing time is over, the controller controls the switch to switch to the standby power supply.If the delay time is set a little larger, the switching caused by the instantaneous voltage drop of the power grid can be avoided (for example, the temporary voltage reduction caused by the start-up of a large motor in a power grid).when the common power supply is normal, the controller starts timing (the timing time is set by the conversion delay potentiometer), and when the timing time is over, the controller controls the switch to switch to the common power supply (self-switching mode);

⑦ Conversion delay time setting potentiometer (standby power conversion and return delay time)
When the switch is in the closed position of the standby power supply (mutual standby mode), if the standby power supply fails and the commonly used power supply is normal, the controller starts timing (the timing time is set by the conversion delay potentiometer), and when the timing time is over, the controller controls the switch to switch to the common power supply