Wilo-EMU TR 50-2… – TR 120-1...

Series description


Submersible mixer with single-stage planetary gear


Utilisation in activated-sludge tanks and sludge tanks for:

  • Generation of flow
  • Suspension of solid matter
  • Homogenization
  • Prevention of floating sludge layers
  • Other areas of application in industry, agriculture and water supply

Type key

Example:Wilo-EMU TR 80-1.29-4/30 S20
TRSubmersible mixer
80x 10 = nominal propeller diameter in mm
29x 10 = propeller speed in rpm
4Number of poles
30x 10 = stator length in mm
S20Propeller code for welded propellers (without = PUR propeller)

Special features/product advantages

  • Secure your processes.
    The planetary gear has large dimensions so that the mixing forces are absorbed efficiently.
  • Efficient energy usage.
    The innovative blade geometry ensures the best possible specific thrust coefficient. At the same time, this reduces your energy and operating costs.
  • Reliable operation.
    Clogging-free operation with backward-curved incoming flow edge.

Technical data


  • stationary installation on walls
  • flexible installation via lowering device
  • can be swivelled horizontally when installed with a lowering device
  • installation with stand allows free placement in basin
  • Single-stage planetary gear


  • Housing components: A 48 Class 35/40 B (EN-GJL-250)
  • Propeller: PUR, AISI 1.4571 or PUR/GRP
  • Propeller hub: AISI 316TI (1.4571)
  • Screwed connections: AISI 304 (1.4301) or AISI 316TI (1.4571)
  • Seal bushing: AISI 316TI (1.4571)
  • Gear shaft: Stainless steel AISI 329 (1.4462)



2- or 3-blade propeller with a nominal propeller diameter of 20 inch (500 mm) to 35.5 inch (900 mm). Entwining-free design made possible by backward-curved incoming flow edge .


Wilo-submersible motor of the T-series with standard connection for an easy and efficient adaptation of the motor output. The motor heat is given off directly to the fluid via the housing. The winding is equipped with a temperature monitor. Large-sized inclined (not with TR 80-1) and grooved ball bearings ensure long service life of the motor bearings.


Sealing is achieved through the use of a 3-chamber system (prechamber, gear chamber and sealing chamber). The large-volume prechamber and sealing chamber collect leakage from the mechanical seal. If desired, the prechamber can be equipped with an external sealing chamber electrode. The sealing between the fluid and the prechamber, as well as between the gear and sealing chamber are realized by a corrosion-resistant and wear-proof mechanical seal made of solid silicon carbide material. The sealing between the prechamber and gear chamber as well as between the sealing chamber and motor are realised by radial sealing rings. A seal bushing ensures long-term corrosion-protected fit of the mechanical seal.


Single-stage planetary gear with exchangeable transmissions. The gear bearings are dimensioned so that the resulting mixing forces are absorbed and are not transferred to the motor bearings.


The power cable is a type NSSHÖU cable for heavy mechanical loads. The power cable enters the motor housing through a water pressure-tight cable lead-in with strain relief and bend protection. The individual wires as well as the cable sheath are additionally sealed to keep out fluids.


A separate configuration must be carried out for each application to ensure optimum generation of fluid current. Carefully follow the instructions for the supplied configuration when installing the units.


Operating mode S1 ‐ permanent operation:

The submersible mixer must be immersed when operated. Surfacing the propeller is strictly prohibited. In the case of fluctuating fluid levels, the system should switch off automatically if the degree of water submersion drops below the minimum level. The power cables must be installed in a way that these cannot be drawn into the propeller!


  • Special voltages
  • Thermistor temperature sensor
  • External sealing chamber control
  • Ceram C0 coating
  • Ex-rated to ATEX, FM or CSA


Scope of delivery

  • Submersible mixer with mounted propeller hub and cable
  • Cable length per customer request
  • Accessories per customer request
  • Operating and maintenance manual




Gear chamber

Sealing chamber

directly driven


FC operation

Single-stage planetary gear

Two-stage planetary gear


Sealing by mechanical seal on motor side

Sealing by rotary shaft seal on motor side

Sealing by mechanical seal on fluid side

Seal for rotary shaft seal on fluid side


Explosion protection


Wet well installation, ground installation


Wet well installation, wall fixation


Lowering device for wet well installation

Tripod for wet well installation


Cast propeller


Steel propeller

PUR propeller

PUR/GRP propeller

GRP propeller



Motor temperature monitoring, bimetal

PTC motor temperature monitoring


Motor leakage monitoring

Sealing chamber monitoring


Propeller blades can be replaced individually



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