71 PCB Mount Switches EAO Series 71 PCB Mount Switches feature printed circuit board (PCB) technology that enables the series to provide versatile and modular opportunities for deployment in applications such as machinery and control cabinet engineering. EAO Series 71 comprises a range of flush mount switches with excellent tactile feedback, IP65 sealing, and contact blocks that can be fitted to any PCB. The pushbuttons, illuminated pushbuttons, keylock switches, selector switches, and indicators can be combined in any arrangement and mounted on the same PCB level.