4" Single-phase oil-cooled PSC O3 Motor (220-230V / 50Hz)

PSC single-phase submersible O3 motors are manufactured to ISO 9001 standards and are designed to operate coupled to hydraulic parts with the same coupling dimensions.  Parts in contact with water  are made of stainless steel; cooling and lubrication of ball bearings are guaranteed by a FDA approved dielectric fluid.  O3 motor requires a start and run control box (CBO, which includes capacitor and manual reset amperometric protection - see Accessories section for more information).  The supply cable connector is removable for quick and easy maintenance.


O3 motors ensure reliable working in 4” or larger diameter wells. The axial and radial oil-lubricated bearings allow for maintenance-free operation. The pressure compensation inside the motor is ensured by a special internal membrane.


  • The rewindable coated stator is inlaid into a 304L stainless steel casing, the design of 24 slots ensures more flexibility and smooth operation, it is varnished and  immersed in dielectric fluid to guarantee optimal cooling capacity of temperature during operation
  • The AISI 420B integral shaft ensures optimal performance thanks to the special surface hardening . The squirrel cage rotor is made of aluminium for all motor powers
  • Oversized ball bearings are completely silent and of high axial load
  • Motors ready to use, prefilled with dielectric fluid
  • Sand protection and mechanical seal designed to guarantee optimal operation even with high quantity of sand in the pumped liquid
  • Safety motor bottom cover for extra protection   
  • All motors are 100% tested

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  • kW: 0,37 - 2,2
  • Voltage range: 220-230V / 50Hz
  • Flange: 4" NEMA standard dimensions
  • Voltage tolerance 50Hz from nominal: +6% / -10% Un
  • Rotation: ccw, facing shaft end
  • Degree of protection: IP 68
  • Insulation: F
  • Rated ambient temperature: max 40° C
  • Cooling flow: min 8 cm/sec
  • Maximum starts/h: 150, equally distributed
  • Mounting: vertical/horizontal, shaft upwards
  • Maximum immersion depth: 150 m
  • Allowed range of water pH: 6,4 - 8,0
  • Thrust: 1.500 N, 2.500N, 4500 N (according to ranges)
  • Protection requirements: For O3 motors without the control box CBO an overload protection and a control unit for motor start and run must be installed according to EN 60947-4-1 trip time < 10 sec. at 5xIn.

Model performance


Information on a proper installation

  • Before installation, it is necessary to verify technical requirements of the given hydraulic part (thrust, power) to select the correct motor.
  • During installation of a motor, it is necessary to verify if the power supply voltage is correct.
  • The correct motor operation is guaranteed when the power cable section is correctly selected, considering the motor power and the distance between the pump and the plug itself.
  • If you are using a generator with an internal combustion engine, it is necessary that the generator’s power measured in kW (in continuous delivery) is three times the rated power in kW of the submersible pump.
  • To guarantee automatic operation mode (the pump starts and stops when open and close the tap) it is necessary to connect a pressure switch and a pressure tank of the correct size, if the plant is not already provided with them.
  • We recommend to install a proper cooling jacket in installations bigger than 10 cm, to guarantee the correct motor cooling flow.
  • The maximum quantity of sand allowed in the pumped water is 120g/m³.


CBO - Start and run control box. DRP - Dry Running Protection device available.

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