Electromechanical thermostat with SPST switch and signal switch

Temperature control with SPST switch and signal switch. Terminal 3-4 closes at temperature rise. Terminal 3-6 closes when warning temperature has been reached. Closing with rising temperature and auxiliary switch (terminal 3-6). The auxiliary switch closes as soon as the cut-in temperature of the temperature control is exceeded by a fixed temperature value (possibly between 4 and 7°C) and normally is applied to initiate a warning signal.