3” Multi-stage electro-submersible pump High-speed with external inverter for constant pressure operation. Hydraulic with closed radial impellers studied to solve all the clear water carrying problems with temperatures which do not exceed 35°.Max content of sand 50 gr/m. Max numbers of intervention 40/h. Particularly suited for 3” or larger wells, irrigation and other civil and industrial applications. Suitable for continuous operation. Vertical and horizontal working. Functions - - High-efficiency brushless motor to reduce energy consumption - External inverter that manage variable speed in order to have a constant pressure independently from the water required - Automatic Start & Stop based on the water required - Dry running protection - Soft start and protection against water hammer - Low or Excess voltage protection - Protection against high temperature and high current Materials - Made with materials suitable for use with drinking water. Pump and motor body, handle, cover and screen in stainless steel AISI 304. AISI 304 ball bearings support .Impellers in glass fiber reinforced PP, diffusers and separators in acetal (POM). Motor shaft in stainless steel AISI 304. Mechanical seal Alumina/graphite. IP65 inverter easily settable with in-built valve and pressure sensor. Electric pump supplied with 1.5m fly lead of ACS certified cable. Extension cable extra Motor - 4 poles three-phase synchronous motor working between 100/200 HZ. Insulation Class F, IP 68. Internal cooling through non-polluting mineral oil. External cooling through pumped liquid.