50A electronic speed controller is used for a brushless motor. Low price brushless ESC controller has a safe voltage of 8V-60V (4-12S) and is designed to automatically help stabilize your car when it detects a momentary loss of control, widely used in remote control and vehicle applications.
Tips: How does an electronic speed controller control speed?
An ESC or an Electronic Speed Controller controls the brushless motor movement or speed by activating the appropriate MOSFETs to create the rotating magnetic field so that the motor rotates. The higher the frequency or the quicker the ESC goes through the 6 intervals, the higher the speed of the motor will be.
Electronic Speed Controller Catalog