Thermal actuator for energy saving, used to regulate surface heating and cooling systems. Operation: NC = Normally Closed N: Neutral Connection L: 230V Live Connection Size (mm): 40 x 60 x 42 FEATURES · First open function for ease of installation · Adaptive stroke length 4mm · Low Power consumption 2W · 100N Force · High quality wax element · Simple open and close indication · Universal M30 x 1.5mm screw thread · 5 year warranty.