The 3SU1900-0BC31-0AS0 is a part of a range of emergency stop (E-stop) pushbuttons from Siemens. It is an emergency stop device that is used to quickly shut off power to machines, processes, and other equipment in the event of an emergency. The 3SU1900-0BC31-0AS0 includes a one-hand operation red contact block, a thermoplastic bezel, and a red plastic contact block. The contact block has a force-guided contact system and a positive opening NC contact that is normally closed. The contact block is IP-65 rated for protection against water, dust, and dust. It complies with EN60947-5-1, DIN VDE 0113, and UL 508 specifications, making it suitable for use in hazardous and wet locations. The bezel is a bright red color, making it easy to spot in the event of an emergency. The 3SU1900-0BC31-0AS0 is suitable for use in machines, production lines, lifting platforms, pedestrian walkways, and other automated processes.