Regenerative drives can run a motor in either forward or reverse direction without having to physically switch the polarity of the motor leads. Reversing on a regen drive is achieved through solid state components eliminating the need for reversing contactors or switches. Reversing with a single quadrant drive requires reversing the polarity of the motor leads via power relays or switches. Regenerative drives can also control a motor with an overhauling load or break a motor to stop. 1Q drive cannot control an overhauling load and require an external brake resistor and switch to stop a motor.