KNX bus device functioning as 4-channel input configurable for the connection of potential-free contacts or passive temperature sensors (NTC 10 kΩ at 25°C, to be ordered separately) and 4-channel output for control of low-consumption LED. Room thermostat function for 4 independent zones. Mounting in wall box or on 35 mm rail (EN 60715) with the support EK-SMG-35 (to be ordered separately). Power supply via bus. Bus terminal block included in the delivery. To be used in KNX installations for home and building automation.