... BC21 NC red diameter 60(head) above emergency stop pushbutton switch are spring turn to release TypeContact typeColorSlackXB2 ... push button, maintained push button, Mushroom push button, emergency stop button, selector switch, key switch, dual push button, ... air temperature -25°c~ +40°cAltitude: ≤2000mRelative air humidity: ≤90%Pollution degree: class 3Protection degree: IP40. IP65 Waterproof ...