Water inlet motor protection circuit

When the start button SB2 is pressed, KM is powered and self-locked, and the motor M starts to run. If water enters the motor at this time and submerges probe A, A is connected to the casing through the water, relay K is closed, the normally closed contact is disconnected, KM loses power and is released, and motor M stops; at the same time, HA beeps Sound the alarm, notify the staff to eliminate the water source, cut off the power switch, and dry the motor.