Patent ID: 8890017

Claim:
A motor operator for switchgear for mains power distribution system, the switchgear comprising: a cabinet with at least one operating shaft for at least one mains switch located inside the cabinet, said operating shaft having a coupling part accessible on a front surface of the cabinet and said operating shaft being rotatable between at least two positions namely corresponding to a closed and an open position of the mains switch, the motor operator comprising: a housing having a front surface and rear surface and a side surface connecting the front and rear surfaces, a rotatable connection shaft with a first and second end said first end being designed for engagement with the coupling part of the operating shaft of the switchgear, said connection shaft rests in a hole in the front surface of the housing, an electric motor, wherein the front surface of the housing includes an opening for the connection shaft, a worm gear with a worm and a worm wheel, said worm being in driving connection with the motor for rotating the connection shaft, wherein the worm wheel and the worm are embedded in a separate worm gear housing and a drive end of the worm is accessible from outside of the housing for connection with the motor, and an adapter is fixedly connected to the second end of the connection shaft, and there is a recess in the worm wheel for rotational interlocking connection of the adapter with the worm wheel.