Motor Drive Unit МZ 4.4



  • Reliable
  • Wide range of special applications on demand
  • Long operational life
  • Low maintenance

Product Info

The motor drive unit MZ 4.4 is the universal drive unit for all Elprom tap changers. It can be used for tap changers made by other manufacturers, as well as for retrofit purposes.
The MDU enclosure is made of aluminium alloy. The front panel is protected from the environment by a protective cover. The motor drive unit is equipped with a lighting unit, a power outlet, a document pocket, etc. by default. Additional functions can be added to the MDU according to the customer's requirements.

Technical Data

Electrical motor rated power 0,75 / 1,1 kW (0,9/1,3 for 60 Hz)
Rated frequency 50 / 60 Hz
Supply voltage 3 AC 380/400 V
Synchronous speed 1500 min -1 (1800 for 60 Hz)
Revolutions of hand crank per tap change operation  33 revs
Revolutions of outgoing shaft per tap change operation 33 revs
Drive shaft torque 17 / 24 Nm
Duration of the tap change operation 4,5 s
Maximum number of operating positions  35
Control circuit voltage AC 220/230 V
Insulation level of voltage Ph - PE  2,5 kV
Heater elements power  300 W
Protective degree IP55
Weight 104 kg

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