Series description


Submersible sewage pump with and without active cooling system for pumping untreated sewage for continuous duty in the stationary and portable wet well installation, as well as for stationary dry well installation.


Pumping of

  • Untreated sewage with faeces and long-fibre components
  • Sewage containing faeces
  • Process water

Type key

Example:Wilo-EMU FA 20.54T + FKT 27.1-4/28KEx
Hydraulics:FA 20.54T
FASubmersible sewage pump
20x10 = nominal diameter of the pressure port, e.g. DN200
54Performance indicator
T = Shut SOLID impeller
G = semi-open SOLID impeller
Motor:FKT 27.1-4/28K Ex
FKTMotor version
1Distinctive number
4Number of poles
28x10 = package length [mm]
KSeal version
E3High-efficiency motor in accordance with IE3 (derived from ISO 60034-30)

Special features/product advantages

SOLID T impeller

  • Patented SOLID hydraulics for reduction of clogging susceptibility, suitable for untreated sewage
  • High hydraulic efficiency
  • Reduction of vibrations through a flow-optimised impeller geometry for secure operation and long service lives
  • Energy-efficient IE3 motor technology available as an option
  • Ceram coating and special material for protection against abrasion and corrosion

SOLID G impeller

  • SOLID hydraulics for reduction of clogging susceptibility, suitable for untreated sewage
  • Consistently high efficiency due to adjustable suction port
  • Process reliability thanks to optimised impeller geometry for safe pumping of untreated sewage with long-fibre components
  • Energy-efficient IE3 motor technology available as an option

Technical data

  • Mains connection: 3~400 V, 50 Hz
  • Submerged operating mode: S1
  • Non-immersed operating mode: S1 (FK, FKT, HC motor) or S2 (T motor, depending on performance)
  • Protection class: IP 68
  • Fluid temperature: 3 ‐ 40 °C, higher temperatures on request
  • Free passage (T impeller): 78x105…150x150 mm
  • Free ball passage (G impeller): 80 or 90 mm
  • Max. immersion depth: 20 m


  • Submersible motors as dry motor or self-cooling motors with active cooling system
  • Longitudinally watertight cable inlet
  • SOLID hydraulics with closed (T) or half-open (G) impeller


Submersible sewage pump as submersible monobloc unit for stationary and portable wet well and dry well installation. Portable installation is possible, depending on type.


The outlet on the pressure side is designed as horizontal flange connection. The maximum possible dry matter is 8 %. “SOLID” impellers are used as the impeller form:

  • T impeller: closed SOLID impeller for very smooth operation and high efficiencies. The hydraulic units are equipped with an impeller wear ring and casing wear ring. These can be readily replaced and contribute to ensuring the long-term, uniform efficiency of the unit.
  • G impeller: half-open SOLID impeller for high non-susceptibility to clogging and good efficiencies in comparison with conventional vortex impellers. The gap between suction port and impeller can be readjusted later. This ensures uniform hydraulic efficiency.


Submersible motors with passive and active cooling are used for the drive:

  • T motors (surface-cooled motors) have passive cooling. They emit their heat directly into the surrounding fluid via the housing parts. For this reason, these motors can operated immersed in continuous duty (S1), depending on performance, and non-immersed in short-time duty (S2).
  • FK, FKT and HC motors are self-cooling and have an active cooling system. The waste heat is guided via the coolant (white oil or water-glycol mixture) to an integrated heat exchanger, and this releases the waste heat to the conveyed medium. As a result, these motors are suitable for continuous duty (S1) either in immersed or non-immersed state.

All motors have a sealing chamber that protects the motor from fluid ingress. It can be accessed from the outside and can be monitored with an optionally sealing chamber electrode. All filling fluids used are potentially biodegradable and environmentally safe.

In addition, depending on performance, high-efficiency motors with the IE3 efficiency class (in accordance with IEC 60034-30) are also available. These motors are marked with the extension “E3” in the type code.

The cable inlet on the motors is longitudinally watertight, cable lengths can be individually configured.


Fluid-side and motor-side sealing is possible in the following versions depending on the motor type:

  • Version H: Mechanical seal for the fluid side, rotary shaft seal for the motor side
  • Version G: Two independently-acting mechanical seals
  • Version K: Block seal cartridge with two independently acting mechanical seals


  • Housing components: EN‐GJL or EN‐GJS
  • Impeller: EN‐GJL or EN‐GJS
  • Static gaskets: NBR
  • Sealing on pump side: SiC/SiC
  • Sealing on motor side: NBR, carbon/ceramic or SiC/SiC
  • Shaft: Stainless steel 1.4021, as of size 49: High-grade steel 1.7225

Scope of delivery

  • Submersible sewage pump
  • Cable length and accessories in accordance with customer requirements
  • Operating and maintenance manual


  • Chains
  • Suspension unit or pump base
  • Fixation sets with anchor bolts
  • Switchgears, relays and plugs

Duty chart

Duty chart




Single-channel impeller


Vortex impeller


Multi-channel impeller


Open multi-channel impeller






Sealing chamber

Leakage chamber

Sealing by mechanical seal on motor side

Sealing by rotary shaft seal on motor side

Sealing by mechanical seal on fluid side

AC motor


Three-phase motor

Direct activation

Star-delta activation

FC operation

dry motor

Motor with oil cooling

Dry motor with closed-circuit cooling


Wet well installation, stationary

Wet well installation, portable

Dry well installation, stationary

Dry well installation, portable


Motor leakage monitoring

Sealing chamber monitoring


Leakage chamber monitoring

Motor temperature monitoring, bimetal


PTC motor temperature monitoring


Explosion protection


Float switch


Capacitor box for 1~230 V





Pump housing

Cast iron


Cast iron

Motor housing

Cast iron


Certification Booklet Wilo-EMU FA + FK-Motor

Article Number 6074692
Edition 1606
Version number 04
Page format A4
Number of pages 44

PDF (754 kB)


Certification Booklet Wilo-EMU FA + FKT-Motor

Article Number 6074691
Edition 1606
Version number 03
Page format A4
Number of pages 56

PDF (867 kB)


Certification Booklet Wilo-EMU FA + HC-Motor

Article Number 6074690
Edition 1606
Version number 04
Page format A4
Number of pages 32

PDF (695 kB)


Certification Booklet Wilo-EMU FA + T-Motor

Article Number 6072704
Edition 1606
Version number 05
Page format A4
Number of pages 68

PDF (1 MB)


General overview

Edition 2017
Page format A4
Number of pages 72

PDF (46 MB)




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