Abstract: A pressure actuated switch including a conductive frame forming a chamber having a pressure fluid inlet connecting thereto, a flexible diaphragm extending across the chamber to separate it into a first chamber connecting to the fluid inlet and a second chamber and where the flexible diaphragm mounts a contact means thereon which is movable into engagement with the second chamber wall when a suitable pressure differential exists between the chambers. A deformable member is positioned in the second chamber and is deformable by movement of the diaphragm towards the frame to bring the contact means into engagement with the frame so that the deformable member normally prevents contact closing action. Electrical connection means are present on the flexible diaphragm and extend from the contact means to a point remote from the frame, which connection means is insulated from the frame.