RAFI KN19 Short-Travel Main Switches C&K Switches RAFI KN19 Short-Travel Main Switches make it possible to implement a power switch directly in a low-profile data entry system. This eliminates the need for extra switches on the device and additional openings in the overlay. Users can also achieve optimum safety and a consistent design. The contact opening widths comply with VDE standards. C&K Switches RAFI KN19 Short-Travel Main Switches can also be employed underneath RK 90 keycaps.