VACUUM CIRCUIT BREAKER Russian patent published in 2012 - IPC H01H33/664 

FIELD: electricity.

SUBSTANCE: vacuum circuit breaker contains housing divided by high-voltage insulator forming arc-extinguishing chamber with axial movable and fixed electrodes. Movable electrode is attached to housing by current lead and metal corrugation separating chamber vacuum environment from ambient environment, fixed electrode is attached by its current lead to housing of arc-extinguishing chamber via separating insulator. Electrodes are provided with annular contacts. Electrodes are designed as disks made from nonmagnetic material with slots in the form of Archimedean spiral, at that angles of spiral radius rotation have reverse direction, fixed electrode has spiral radius rotation φ>0 and movable electrode has spiral radius rotation φ<0.3.

EFFECT: increasing concentration of magnetic field in intercontact interval, reducing electroerosive wear of contacts and improving commutating characteristics.

3 dwg