AB-Series Process Sealed Subminiature Pushbutton SwitchesProcess Sealed Subminiature Pushbuttons 0.4VA Logic Level; Process Sealed, PCB Mount Subminiature size saves space on PCBs. Specifically developed for logic-level applications. Award-winning STC contact mechanism offers benefits unavailable in conventional mechanisms: smoother, positive detent actuation, increased contact stability, and unparalleled logic-level reliability.