The 3SF5803-4DB00: The description breaks down the actuator configuration: the black pushbutton (typically the START or ON function) carries the "I" plate, and the red pushbutton (STOP or OFF) carries the "0" plate. This follows the IEC 60417 standard for machine control symbols. The enclosure is factory-assembled, so there is no separate ordering of buttons, plates, and housings — one order code gives you a ready-to-mount unit for a panel or machine pendant.
With a current lifecycle stage, this 3SF5803-4DB00 is not subject to a last-time-buy or discontinuation notice. It is sourced through the standard Siemens industrial control supply chain.