Wall mounted electrical distribution board is applicable to circuits with AC frequency of 50Hz and rated working voltage of 500V and below. Under special requirements, the protection grade can reach IP55, the box has knock down holes on the upper and lower sides, and the multi pipe incoming line can reserve live mounted perforated plates with a rated current of 400A. It is especially suitable for user metering electrical distribution boardes in industrial and mining enterprises, hotels, civil residential buildings and so on. The ambient air temperature of wall mounted electrical distribution board shall not exceed+40 ℃, and the lower limit of ambient air temperature is - 5 ℃. The relative humidity of the air shall not exceed 50%, and it is allowed to have a higher relative humidity at a lower temperature, such as 90% at + 20 ℃. The altitude of the installation site shall not exceed 2000m. The structure of the wall mounted electrical distribution board is welded from sheet steel. The measuring instruments, button indicators and control switches can be installed on the door. Other electrical equipment such as contactors, relays, terminal blocks, etc. can be installed on the rack in the box. Knock down holes are punched on the upper and lower walls of the box shell to facilitate the installation of cables or pipes of various specifications.