Why MOSFET is used as switch? All Questions › Category: Power Electronics › Why MOSFET is used as switch? 0 Vote Up Vote Down CS Electrical And Electronics Staff asked 4 years ago I need short information. 1 Answers 0 Vote Up Vote Down chetan shidling answered 4 years ago Because the switching speed of MOSFET is high, so in many applications MOSFET is used as a switch.