... 2-NC2. ApplicationUsed to either close or open an electrical circuit. Used in various applications such as electric power,telecommunication, machinery ... maintained:250.000Electrical durability:500,0004.Packing 1pc/white box,20pcs/kraft box,200pcs/carton Carton size:36*29*24.5mm ... ,with key,with light,self-lock,self reset,convex,waterproof... ip66 waterproof pushbutton switch XB4-BP21,spring return