4" Single-phase oil-cooled O2 Motor (220-230V / 50Hz)

2-wires single-phase submersible O2 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.  O2 motor does not require a start and run control box as the capacitor is built into it. Supply cable connector is removable for quick and easy maintenance.


O2 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 - 1,1
  • 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: 100 m
  • Allowed range of water pH: 6,4 - 8,0
  • Thrust: 1.500 N, 2.500 N (according to ranges)

Automatic protections

Thermal protection

Thermal protection

The built in thermal protection system stops the O2 motor when overheated. This can happen because of: the high temperature of the pumped liquid; when the minimum distance between the pump installed and the well bottom isn’t respected; when the pump is installed in well/tanks bigger than 4” without a proper cooling system; when the pump works in shut-off.

Overload protection

Overload protection

In case the pump is partially o totally blocked, the O2 motor is protected against overload.

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.
  • In order to reset the thermal protection, disconnect the pump power, wait that the correct working temperature parameters are restored, then plug it in again.

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