OPERATIONAL POLE DEVICE IN MEDIUM VOLTAGE ELECTRIC CONTROL APPARATUS Russian patent published in 2017 - IPC H01H3/00 

FIELD: electrical engineering.

SUBSTANCE: invention relates to a device for controlling poles of electric protective devices capable of actuating shaft (1), to support movable contacts between open pole position, wherein movable contacts and fixed contacts of apparatus are separated, and a closed pole position, wherein said movable and fixed contacts are closed, device comprises closing spring (2), controlled by working shaft (3), wherein said spring (2) is capable of transmitting energy for closing said first shaft (1) after compression and moving said spring (2) beyond line of neutral point of passage using cam (8), rotated by second shaft (3), and interacting with roller (5), fixed on first shaft (1). Device comprises means (13) of holding control shaft in closed position and means (18, 5) for disconnection of said holding means (13), said holding means (13) are supported by said cam (7, 8).

EFFECT: providing constant control and power control.

19 cl, 12 dwg