Thermostat RAA31
Thermostat RAA31 1 Thermostat RAA31 2 RAA31 thermostat dimensions RAA31 thermostat installation diagram


  • Height: 97mm
  • Width: 96mm
  • Depth: 29mm
  • Depth with the regulator: 35,4mm

Technical data

  • Frequency: ~250V/ 50 or 60Hz
  • Switching current: 0,2...6(2)A


  • The thermostat can be fitted to most commercially available recessed conduit boxes or directly on a flat wall.
  • Mounting height is about 1.5m above the floor
  • Minimum distance from doors and doorways 20sm.

Electromechanical room thermostat Siemens S55770-T221 RAA31

Electromechanical room thermostat Siemens RAA31 is used for heating and/or cooling applications and for maintaining selected room temperature.


Typical use:

  • Commercial buildings
  • Residential buildings
  • Light industrial buildings

in conjunction with:

  • zone valves
  • thermal valves


If the room temperature falls below selected setpoint, the thermostats heating contact will close. If the room temperature exceeds the selected setpoint, the thermostats cooling contact will close.