The ATR U2 enables the simplest way of controlling mains voltage consumers using low-voltage contacts. A power supply unit for controlling the relay coil is not required, as the ATR U2 generates the necessary control voltage (24V DC PELV) internally. In conjunction with the MKW 1 magnetic contact, for example, supply air monitoring, which is often required for closed rooms when operating extractor fans, can be implemented with little effort. However, the 10A changeover contact means that the ATR U2 is also very versatile for other applications., Dimensions: 43x43x18.5mm, 230V AC - 1W 10A