With introducing the foreign SMC, DMC advanced technology, ammeter case was developed in copperate with the 253 project technicians of the China FRP research institute. It has outstanding performan ces, sucha s proof- corrosion, absolutely sealed proof-water. Because of its good insulation the applied materials, no grounding coil is needed. Also it has the safe protection of the lock and lead-seal. Service life is more than 60 years in the room, above 30 years out side the room.

There is no hurt on it when we pressed 3 times on every we ak places of the outside-shell of the pressing checker with the strength 1 N.m. Now we can supply o ne to six SMC ammeter case and more than 10 modes. At the sam e time, it has any other functions such as alone controlling the switches inside the case and outside. We will constantly develop more nonstandard power controlling equipments according the requires of our clients.