KPU 19 thermostats are used for temperature regulation in refrigeration, freezing, air conditioning, ventilating and heating systems. KPU 19 thermostats are fitted with Single-Pole Double-Throw (SPDT) or Single-Pole SingleThrow (SPST) contact system. The standard KPU 19 enclosure is rated NEMA ~ 1. NEMA ~ 1 is obtained when the thermostat is mounted on a flat surface with all unused holes covered