Siemens SIRIUS ACT Red Push Button Complete Unit NC Latching. Cutout Diameter: 22mm. Push Button Style: Mushroom. IP Rating: IP20, IP66, IP67, IP69, IP69K. Maximum AC Voltage: 500V. Maximum DC Voltage: 500V. Push Button Shape: Round. Mounting Type: Panel Mount. Push Button Diameter: 40mm. Body Material: Plastic. Push Button Marking: Unmarked. Minimum Operating Temperature: -25°C. MPN: 3SU1100-1BA20-1CA0