This is an original Kärcher motor switch, part number 6.631-428.0 (normalized to 66314280), designed for a wide range of Kärcher high-pressure cleaners. It is a crucial component for controlling the motor's operation, ensuring proper functionality and safety. This genuine Kärcher replacement part guarantees optimal performance and compatibility with specified models, including various K2, K3, K4, K5, and K7 series machines. Replace a faulty switch to restore full control and extend the life of your Kärcher pressure washer.