For universal use, for example, for direct floor, floor space, open space heating, pool control, air conditioning systems. The device is suitable for heating & cooling functions, & features an adjustable hysteresis of 0.5 to 10 K. A temporary reduction in temperature (forexample, night drop) by 5 K can be realized by a connection of a timer switch on the potential-free contacts. A green LED indicates when the relay has attracted, a red LED indicates a probe break.