The ATR 4000 digital surface-mounted temperature controller combines modern design with maximum convenience. Its slim design with an installation height of just 21 mm blends seamlessly into any room design. The ATR 4000 has a noiseless triac output and is available in the colour active white RAL 9016. Thanks to the remote sensor input, the ATR 4800 can be used as a limiter or with an external relay for electrical applications. The Advanced version can be upgraded to 16A switching current at any time using the new flush-mounted puck (UPP 16). The compact relay in the in-wall box ensures that the controller remains flat and that there is sufficient space for the wiring and remote sensor.