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

FIELD: electricity.

SUBSTANCE: vacuum circuit breaker includes housing separated with high-voltage insulator, thus forming arc-extinguishing chamber with axial movable and fixed electrodes. Movable electrode is attached to housing by means of current lead and metal corrugation that separates vacuum medium of the chamber from environment. Movable and fixed electrodes are equipped with annular contacts in which equal radial slots which are uniformly located in circumferential direction are made on the side of their being attached to the corresponding electrodes. In slots of annular contacts there inserted are U-shaped constant magnets which are symmetrical relative to contact surface of contact connection and connected to each other which the circuit breaker is on. Polarity of poles of magnets which are located opposite each other on movable and fixed annular contacts is the same.

EFFECT: increasing concentration of magnetic field in inter-contact gap, reducing electro-erosion wear of contacts and improving switching characteristics.

3 dwg