The ZAS K2 is a complete device set, consisting of the active isolating relay ATR U2 and the magnetic contact MKW 1. Ideal for controlling exhaust air systems/extractor hoods in conjunction with room air-dependent fireplaces in accordance with combustion regulations. The active isolating relay enables the switching of mains voltage consumers using low-voltage contacts in the simplest way. A power supply unit for controlling the relay coil is not required, as the relay generates the necessary control voltage (24 V DC PELV) internally. In conjunction with the magnetic contact MKW 1, for example, supply air monitoring, which is often required for closed rooms when operating extractor fans, can be implemented with little effort. The changeover contact makes the ATR U2 extremely versatile., ATR U2: 230V AC, 1 changeover contact 10 A