The 3SF5812-0A.: The Siemens 3SF5812-0A is an AS-Interface enclosure for command devices — a 22 mm round plastic housing with a gray top, designed for two control points. It is not an emergency stop device and does not offer positive opening of contacts, so it is suited for signaling or selector functions rather than safety-rated stop circuits.
The enclosure accepts a 22 mm round installation opening and can be fastened vertically or horizontally. It ships without a pre-wired strip terminal, a front ring, or an integrated light source — the buyer adds the command device (pushbutton, selector switch, indicator) and the AS-Interface node separately.