On-load Tap-Changers

Vacuum type OLTCs
SF6 Gas Insulated Vacuum Type OLTCs
Arcing contacts in oil OLTCs

De-energized Tap-Changers

Series PBVE
Series PBV
Series PBVKL

Drive units

Hand Drive
Motor Drive

Motor Drive


Motor Drive Unit МZ 4.4

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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.

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 outgoing shaft per tap change operation

33 revs

Maximum number of operating positions


Control circuit voltage

AC 220/230 V


104 kg