Brake resistors are used in motor systems in which the motor is controlled by a drive and helps to control the engine through a process called dynamic braking. The braking resistor operation in AC and DC motors is different. As the engine accelerates, electric energy is converted into mechanical energy, and in the negative acceleration, kinetic energy is converted through the motor to electrical energy, which should be eliminated. For the brake to be fast enough, this energy must be brought into a resistor and repelled in the form of heat. This action generates a brake on the system and therefore protects the motor drive electrical in a safety mode.