Sirius Act series pushbutton features a cutout diameter of 22mm with a blue, round, flat pushbutton made from plastic. It has a pushbutton actuation at the end and a diameter of 29.5mm. The protection class is rated IP66, IP67, and IP69K.

These extremely robust pushbutton heads from Siemens are made of high-quality plastic and comply with IEC 60947-1, EN 60947-1, IEC 60947-5-1, and EN 60947-5-1 standards. They are available in a variety of colors, with options for illumination, without illumination, or in a mushroom head design. The self-retaining actuator function during mounting and anti-rotation feature are integrated into a patented holder design. Stackable contact modules make them suitable for use in extreme environments, and no special tools are required for installation. The design allows for simple geometry for mounting holes, with options for latching or momentary actuation.