For universal use, e.g., for direct floor heating, storage floor heating, outdoor heating, swimming pool control, and climate technology. The device is suitable for heating and cooling functions and features an adjustable hysteresis of 0.5 to 10 K. A temporary temperature reduction (e.g., night setback) of 5 K can be achieved by connecting a timer to the potential-free contact. A green LED indicates when the relay is activated, while a red LED signals a sensor break.