4" Single-phase water-cooled H2 Motor (220-230V / 50Hz)

2-wires single-phase water-cooled encapsulated H2 submersible 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 the thrust block and bushes are guaranteed by a mixture of water and glycol. The H2.DRP single-phase motor does not require a start and run control box (CBH), as the capacitor is built into it the Noryl ® casing at the bottom. Supply cable connector is removable for quick and easy maintenance.



Single-phase water-cooled encapsulated H2 motors ensure reliable working in 4” or larger diameter wells. The axial and radial water-lubricated bearings allow for maintenance-free operation.


  • The stator is hermetically sealed by 304L stainless steel flanges and internal and external casings, filled by special resin to guarantee optimal cooling capacity of temperature during operation. The design of 24 slots ensures more flexibility and smooth operation.
  • The Aisi 420B integral shaft ensures optimal performance thanks to the special surface hardening and the polishing in the bushes working area. The squirrel cage rotor is made of aluminium for all motor powers.
  • The rotor is set on Kingsbury thrust block equipped with carbon clearance ring and oscillating pads in high-strength stainless steel to sustain high axial loads
  • High efficiency electrical design to guarantee low operation cost
  • Sand protection designed to guarantee optimal operation even with high quantity of sand in the pumped liquid
  • Axial and radial lubricated bearings for maintenance free operation
  • Removable lead connector
  • Motors pre-filled with non-contaminating antifreeze lubricant liquid.
  • All motors are 100% tested in every production phase

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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
  • Maximum quantity of suspended sand: 120 g/m³
  • Insulation: F
  • Rated ambient temperature: max 30° 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, 3.000 N (according to ranges)

Automatic protections

Thermal protection

Thermal protection

The H2 motor is protected against overheating. 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. In such cases, the built-in thermal protection system stops the pump, which automatically restarts as soon as the correct working temperature parameters are restored.

Overload protection

Overload protection

The H2 motor is protected against against overload. In case the pump is partially or totally blocked, it automatically restarts as soon as the correct working temperature parameters are restored.

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/pump, 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 protections, wait until correct working temperature parameters are restored.

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