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Wilo-Drain MTC

Series description


Submersible sewage pump with external macerator for continuous duty for stationary and portable wet well installation.


Pumping of

  • Sewage containing faeces
  • Pre-cleaned sewage without faeces and long-fibre components
  • Wastewater

Type key

E.g.:Wilo-Drain MTC 32F55.13/66Ex
MTMacerator technology
CCast iron version
32Nominal diameter [mm]
FImpeller shape
55Max. delivery head [m]
13Max. volume flow [m3/h]
66Power P2 [kW] (= value/10 = 6.6 kW)
ExATEX approval
AWith float switch and shockproof plug

Special features/product advantages

  • Heavy-duty version made of cast iron
  • External macerator
  • Sealing with mechanical seal on fluid side
  • Oil barrier chamber
  • Longitudinally watertight cable inlet

Technical data

  • Mains connection: 1~230 V, 50 Hz (only MTC 40) and 3~400 V, 50 Hz
  • Immersed operating mode: S1
  • Non-immersed operating mode: S2‑15 min or S3 30%
  • Protection class: IP 68
  • Insulation class: F
  • Fluid temperature: 3…40 °C (MTC 40: 3…35 °C)
  • Cable length: 10 m


  • Macerator with external blade and pulling cut
  • Winding temperature monitoring with bimetallic strip


Submersible sewage pump with external macerator as submersible monobloc unit for stationary and portable wet well installation in continuous duty.


The outlet on the pressure side is designed as horizontal threaded/flange connection or as flange connections. Open multi-channel impellers are used.


The motors available are surface-cooled motors in single-phase version (only MTC 40) and three-phase version for direct starting. The waste heat is given off directly to the surrounding fluid via the motor housing. These motors can operated immersed in continuous duty (S1) and non-immersed in short-time duty (S2) or intermittent operation (S3).

Furthermore the motors are equipped with thermal winding monitoring. The thermal winding monitor protects the motor winding from overheating. Bimetallic strips are used for this as standard.

Depending on the size, the motor can also be fitted with an external electrode to monitor the sealing chamber. This signals if there is water ingress into the sealing chamber through the seal on the pump side.

The connection cable has bare cable ends and a length of 10 m as standard, and is available in following versions: The "A" model is equipped with a float switch and shockproof plug.


There is a sealing chamber between the motor and hydraulics. It is filled with medical white oil and protects the motor from media ingress by the seal on pump side. Pump-side and motor-side sealing is available in different versions depending on the motor type:

  • MTC 32F33.17 and ...39.16: mechanical seal on the fluid side, two rotary shaft seals on the motor side
  • MTC 32F22.17, ...26.17, ...49.17, and ...55.13: two independently acting mechanical seals
  • MTC 40: two independently acting mechanical seals


  • Motor housing: EN-GJL-200 or EN-GJL-250
  • Hydraulic housing: EN-GJL-250
  • Impeller: EN-GJL-HB175, EN-GJS-500 or EN-GJL-250
  • Shaft: Stainless steel 1.0503, 1.7225 or 1.4021
  • Macerator: Stainless steel 1.4112, Abrasit/1.4034 or X102CrMo17K4
  • Sealing on pump side: SiC/SiC
  • Sealing on motor side:
    • MTC 40: Al oxide/SiC
    • MTC 32F16.17, MTC 32F22.17 and MTC 32F26.17: SiC/SiC
    • MTC 32F33.17 and MTC 32F39.16: NBR
    • MTC 32F49.17 and MTC 32F55.13: Carbon/ceramic
  • Static gasket: NBR

Scope of delivery

  • Pump
  • 10-metre connection cable with bare cable end
  • A version with attached float switch and shockproof plug
  • Installation and operating instructions


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

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

Version A

Capacitor box for 1~230 V


Version A


Pump housing

Cast iron


Cast iron

Motor housing

Cast iron


Certification Booklet Wilo-Drain MTC 32

Article Number 6080666
Edition 1605
Version number 01
Page format A4
Number of pages 11

PDF (445 kB)


General overview

Edition 2017
Page format A4
Number of pages 72

PDF (46 MB)


Wilo-Drain MTC 32

Article Number 2090114
Edition 1607
Version number 04
Page format A4
Number of pages 26

PDF (1 MB)



Tipps & Guides

General Overview 2018

PDF: Wilo-Drain MTC


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