Wilo-Actun FIRST-SPU4


Durable because all parts in contact with the pumped liquid are resistant to corrosion.
Built-in check valve
Resistant to wear because of pop-up impellers
Service friendly electric motor


Multistage submersible motor pump 4" casing version for vertical or horizontal installation


  • For water supply from wells and rainwater tanks
  • Use in domestic water supply systems, irrigation and irrigation
  • Pressure boosting
  • Lowering of the water level
  • Pumping water without long fibrous and abrasive impurities
  • Equipment/function
  • Multistage submersible motor pump with radial or semi-axial impellers
  • Rewindable, oil-filled electric motors
  • Built-in check valve
  • Coupling according to NEMA
  • Single-phase or three-phase motors

Scope of delivery

  • Hydraulics complete with electric motor
  • 2.0/2.5 m power cable (cross section: 4×1.5 mm2)
  • Installation and operating instructions

Model overview

Those. information

Explanation of the name

Example Wilo-Actun FIRST SPU4.01-10-B / XI4-50-1-230
Actun Product Series
FIRST Series Designation
SPU Type designation (& bdquo; Submersible Pump for Universal use & ldquo; with plastic impellers)
4 Nominal pump diameter in inches
01 Nominal flow rate in m & sup3; / h
10 Number of steps
B Tech Generation
XI Indicates the installed motor, the series is mostly made of stainless steel (Inox)
4 Nominal motor diameter in inches
50-1-230 Electrical design; 50 Hz, 1 ~ 230 V

Technical Specifications

  • Mains connection: 3~, 400 V, 50 Hz
  • Operating mode in immersed state: S1
  • Temperature of pumped liquid: 3-30 °C
  • Minimum motor flow speed: 0.2 to 0.5 m/s (depending on motor capacity)
  • Max. sand content: 150 g/m3
  • Max. number of starts: 10 - 20/h (depending on motor power)
  • Max. immersion depth: 200 m
  • Protection class: IP 68
  • Pressure connection: NPT 3 to NPT 6


  • Casing hydraulic section: stainless steel 1.4301
  • Impellers: NORIL
  • Pump shaft: Stainless steel 1.4104
  • Motor housing: Stainless steel 1.4301
  • Motor shaft: Stainless steel 1.4305


Submersible pump for vertical or horizontal installation.

Hydraulic part

Multistage submersible pump with radial or semi-axial impellers in split casing design. Built-in check valve. Stainless steel parts in contact with fluid.

Electric motor

Corrosion proof single phase or three phase electric motor, rewindable with direct start possibility. With mechanical seal, self-lubricating bearings, filled with oil.


Motor is cooled by pumped liquid. The motor may only be operated when submerged. The maximum temperature limit of the pumped liquid must not be exceeded and the minimum flow must not drop below the minimum allowable level. Vertical installation can be done with or without a cooling jacket - customer's choice. A cooling jacket is required for horizontal installation.


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