Siemens 3SU1801-0NB00-2AC2 Pushbutton Enclosure

Siemens 3SU1801-0NB00-2AC2 is a round, 22 mm plastic enclosure from the SIRIUS ACT family designed to house a command device—specifically an EMERGENCY STOP mushroom pushbutton (40 mm, red) with rotate-to-unlatch actuation. The enclosure features a yellow top part with a protective collar and a single plastic control point; it provides two normally closed contacts (1 NC, 1 NC) via a screw-terminal interface and is intended for floor mounting. Cable entries are 1xM20 at the top and 1xM20 at the bottom, enabling wiring in and out of the enclosure. This enclosure, identified by 3SU1801-0NB00-2AC2, is designed for use with 22 mm emergency-stop devices in industrial control systems, delivering a compact, maintenance-friendly option for safety circuits in control panels.