Sanhe One for One Switch Controller, Features as per following:
1)One switch controller control and protect one exhaust fans to start on and off
2)Can control the fan start on or off by remote control, remote distance: 15m;
3)It will cut of automatically when motor lack of phase, over-load and over current, to protect the motor.
4)Instead of traditional thermocouple sensor current test, electric tester makes quite accurate test on lack of phase and over-current. Prompt protection, takes 8 seconds only