With the ATR U2, mains-voltage consumers can be activated simply and conveniently via extra-low-voltage contacts.
A power pack is not required to energize the relay coil, as the ATR U2 generates the required control voltage (24 V DC PELV) internally.
In combination with the solenoid contact MKW 1, it permits simple realization of the supply air monitoring that is frequently stipulated when operating extractor fans in enclosed rooms.
Due to the 10A two-way switch, however, the ATR U2 can also be used for a whole variety of other applications.