Wilo-EMU TR 212… – TR(E) 326…

Series description


Slow-running submersible mixer with two-stage planetary gear reduction


  • Energetically optimized mixing and circulation of activated sludges
  • Generation of flow rates in circulation channels

Type key

E.g.:Wilo-EMU TRE 321.36-4/12
TRSubmersible mixer
EHigh-efficiency motor in accordance with IE3/IE4 (derived from IEC 60034‑30)
3Number of blades
21x 100 = nominal propeller diameter in mm
36Propeller 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

  • Mains connection: 3~400 V, 50 Hz
  • Submerged operating mode: S1
  • Protection class: IP 68
  • Max. fluid temperature: 40 °C
  • 2-stage planetary gear with an exchangeable 2nd planetary gear
  • Mechanical shaft seal with SiC/SiC pairing
  • Permanently lubricated roller bearings
  • Max. immersion depth: 20 m


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


  • Housing components: EN-GJL-250
  • Propeller blades: GRP vinyl ester; TRE 312: PA 6C
  • Propeller hub: EN-GJS-400
  • Screwed connections: Stainless steel 1.4571
  • Seal bushing: Stainless steel 1.4571
  • Gear shaft: Stainless steel 1.4462



2- or 3-bladed propeller in sandwich-style construction with a nominal propeller diameter of 1200 mm to 2600 mm.

TRE 312: 3-blade, solid-material propeller with a nominal propeller diameter of 1200 mm.

All propellers have an clogging-free design made possibly by backward-curved flow edge.


Wilo-submersible motor of the T-series (surface-cooled motor) with standard connection for an easy and efficient adaptation of the motor power. 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 high-efficiency TE motors which meet the IE3/IE4 classification (derived from IEC 60034‑30).


Sealing is achieved through the use of a 3-chamber system (pre-chamber, gear chamber and sealing chamber). The large-volume pre-chamber and sealing chamber collect leakage from the mechanical seal. If desired, the pre-chamber can be equipped with an external sealing chamber electrode. The sealing between the fluid and the pre-chamber, 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 pre-chamber 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 inlet 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.


Immersed operating mode S1:

The unit can be used immersed in continuous duty. Surfacing the propeller or motor 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.

When installing the power cables, make sure that they are not drawn into the propeller by the fluid current.


  • Special voltages
  • PTC thermistor sensor
  • External sealing chamber control
  • Ceram coating C0
  • Ex-rated to ATEX or FM


  • Stand for free positioning of the units in the basin
  • Auxiliary lifting device
  • Special fastening pieces for the use of an auxiliary lifting device for multiple units
  • Additional rope anchoring
  • Fixation sets with anchor bolts

Scope of delivery

  • Submersible mixer with cable per customer request
  • TR 212 and TRE 312: Propeller completely pre-assembled
  • TR(E) 216, 221, 226-3, 316, 321 and 326-3: Propeller blades - delivered loose, installation on-site
  • Accessories according to 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

• (not TR 212)


Certification Booklet Wilo-EMU AVMS(H)/ AVUS(H)

Article Number 6078119
Edition 1509
Version number 02
Page format A4
Number of pages 29

PDF (529 kB)


Certification Booklet Wilo-EMU AVU

Article Number 6078118
Edition 1509
Version number 02
Page format A4
Number of pages 29

PDF (522 kB)


Certification Booklet Wilo-EMU TR(E) / Wilo-Sevio MIX BG / Wilo-Sevio FLOW BG

Article Number 6074694
Edition 1702
Version number 02
Page format A4
Number of pages 32

PDF (1 MB)


Certification Booklet Wilo-EMU HHV

Article Number 6072705
Edition 1509
Version number 03
Page format A4
Number of pages 32

PDF (606 kB)


Drainage and Sewage

Page format A4
Number of pages 24

PDF (8 MB)


General overview

Edition 2017
Page format A4
Number of pages 72

PDF (46 MB)


Wilo-EMU TR 2xx / TR 3xx (Maxiprop/Megaprop)

Version number 3.0
Page format A4
Number of pages 89

PDF (3 MB)



PDF: Wilo-EMU TR 212… – TR(E) 326…


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