KST Long Travel Tact Switches C&K Switches KST Long Travel Tact Switches are a J Bend or Gullwing type for SMT and are compatible with pick and place machines. The IP40 sealed KST tact switches are RoHS compliant and compatible. The tact switches feature a rubber actuator, silver or gold contact material, 1 make contact (SPST N.O.), and momentary function. Ideal for front panels, car dashboards, telephone sets, and instrumentation.