Siemens 3SB3801-2EJ20 Emergency Stop Push Button

Siemens 3SB3801-2EJ20 is a metal command-device enclosure designed to house a 40 mm emergency-stop mushroom pushbutton, intended for front-plate mounting in control panels. The unit is specified for 1 normally open (NO) and 2 normally closed (NC) contacts, enabling a stop circuit plus signaling lines. It is configured for a 22 mm pushbutton program within the SIRIUS 3SB3 family, featuring a yellow top part and a clearly labeled EMERGENCY STOP surface. The enclosure provides front-plate mounting hardware and a dedicated EMERGENCY STOP label area for quick, unmistakable identification on the panel. Typical applications include machine safety in automation panels, conveyors, presses, and packaging lines where a dedicated emergency-stop point is required. As part of Siemens' SIRIUS 3SB3 ecosystem, the enclosure is designed to be combined with compatible pushbuttons to create a reliable emergency-stop control point within industrial control cabinets.