Dynamic Braking Resistors are used with AC Variable Frequency Drives to produce a braking torque in the motor during overhauling load conditions. They are double insulated rated at 1000 volts. The resistance value in ohms determines the amount of braking torque produced, and thus the rate at which the motor will stop. The resistor wattage is sized to prevent overheating during normal braking cycles. Dynamic Braking Resistors are often added to prevent over-voltage trips on the drive when stopping the motor.