Wilo-EMU TR 212… – TR(E) 326…

Series description


Slow-running submersible mixer reduced by two-stage planetary gear


  • Energetically optimized mixing and circulation of activated sludges
  • Generation of flow rates in circulation channels
  • Further areas of application in industry

Model Numbers

Example:Wilo-EMU TRE 321.38-4/12
TRSubmersible mixer
EHigh-efficiency motor in accordance with premium class (IE3; derived from IEC 60034‑30)
3Number of blades
21x 100 = nominal propeller diameter in mm
38Propeller speed in rpm
4Number of poles
12x 10 = stator length in mm

Special features/product advantages

  • Efficient energy usage.
    The innovative blade geometry and energy-efficient IE3/IE4 motors ensure the best possible specific thrust coefficient. At the same time, this reduces your energy and operating costs.
  • Consistently reliable.
    The low-wearing GFK/PA6 propeller is durable and scores with its self-cleaning effect.
  • Smooth running thanks to the balanced propeller load, even in high thrust ranges and when incoming flow conditions are unfavourable.

Technical data


  • installation with stand allows free placement in basin
  • flexible installation
  • Two-stage planetary gear with exchangeable second planetary gear speed


  • Housing components: A 48 Class 35/40 B (EN-GJL-250)
  • Propeller blades: GRP vinyl ester; TRE 312: PA 6C
  • Propeller hub: A 536A 60-40; TRE 312: AISI 316TI (1.4571)
  • Screwed connections: 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 47 inch (1200 mm) to 102.5 inch (2600 mm).

TRE 312: 2-blade, solid-material propeller with a nominal propeller diameter of 47 inch (1200 mm).

Non-ragging 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 and grooved ball bearings ensure long service life of the motor bearings.

TRE units are equipped with the high-efficiency “TE motor” which meets the “Premium classification” (IE3; derived from IEC 60034-30).


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.


2-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 entry 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 - Continuous duty:

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 cable per customer request
  • TR 212 and TRE 312: Propeller completely assembled
  • TR(E) 216, 221, 226-3, 316, 321 and 326-3: pre-mounted hub, Propeller blades - delivered loose, installation on-site
  • Accessories per customer request
  • Operating and maintenance manual




Gear chamber

Sealing chamber

directly driven


VFD 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


Guide rail system 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


PDF: Wilo-EMU TR 212… – TR(E) 326…


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