THREE-POSITION VACUUM LOAD DISCONNECTING SWITCH Russian patent published in 2016 - IPC H01H31/00 H01H33/666 

FIELD: electricity.

SUBSTANCE: three-position vacuum load disconnecting switch comprises one or several phases joined by the common frame. Each phase has a base insulator with current lead and vacuum arc-quenching chamber placed in a protective insulating case with spring-actuated mechanism of contacts opening and contact arm rotating in vertical plane around the axis in the case, the master fixed contact connected electrically to the current lead and vacuum arc-quenching chamber, and the master movable contact installed at the other base insulator. Cam lifter is installed additionally at the master movable contact and coupled electrically to it; at the frame there is an additional metal base with fixed ground contact and the third base insulator with the second current lead coupled by a flexible current conductive link with a movable contact. The master movable contact performs rotational motion in horizontal plane. When switched on, it closes the master fixed contact, at turn to angle of 90° it forms visible rapture while at turn to angle of 180° it closes the ground contact. At closing and opening the master contacts, impacting the contact arm, the cam lifter leads to preliminary closure and opening of contacts and current switching inside the vacuum arc-quenching chamber.

EFFECT: combining functions of cutoff, disconnecting and grounding switch in one mechanism with control from the same wire.

4 dwg