Scope of not more than 2000m above sea level the ambient temperature does not exceed +40 ℃, not less than -20 ℃ ambient relative humidity less than 95% (equivalent to +25 ℃) for Ⅱ A, Ⅱ B Explosive Class T1 ~ T4 gas mixture (1 and Zone 2) areas with a mild corrosive environment, but does not contain serious damage to the metal and insulation for the gas there is less voltage 380V, rated current 6-16A of the circuit, as the connection hand-held power tools and lighting aluminum alloy shell with plastic sprayed surface. Outlet with the points, combined protective cover and non-charged openings mark. Grounding contact plug length than the main contact, so that the main ground contact is not connected before the first turn, pull out the plug at the last minute to break ground in order to ensure the safety latch and the switch made of chain structure, when plug is inserted, turn on the plug rotated to a certain set of right angle plug that closed within the same time, can not pull off the plug. On the contrary, will be transferred to cover a certain angle to the left, then switches off, and then to pull the plug, socket is equipped with protective cover, pull out the plug, the protective cover shielding the socket to prevent foreign matter, conduit or cable wiring, cabling should be fitted with cable sealing connector.