THREE-PHASE VACUUM CIRCUIT BREAKER Russian patent published in 2019 - IPC H01H33/66 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering and can be used for creation of three-phase vacuum switches having the possibility of manual AC disconnection with application of minimum forces for their disconnection. Three-phase vacuum circuit breaker comprises housing, synchronizing shaft, movably fixed by its ends on opposite walls of housing, three pole housings, fixed by their lower bases on upper surface of housing, three vacuum arc-extinguishing chambers installed inside each pole, three electric insulating tie rods, located corresponding parts of their external side surfaces in the hole made in each lower electric outlet housing, three drives for movement of movable contacts of each vacuum arc-quenching chamber, three mechanisms for disconnection of movable contacts from fixed each arc-quenching chamber, made in form of second cylindrical springs, located by its external side surface near inner surface of each second cylindrical barrel and abutting their upper ends in corresponding sections of each lower surface of upper bases of drive through insert and by its lower ends installed on the corresponding section of the inner surface of the stepped recess made in the bottom of each second cylindrical bar for accommodating the electric insulating rods with the protrusion on the corresponding section of the external surface of the electric insulating rod and the annular stop, three anchor latching mechanisms made in the form of permanent magnets. Mechanism of manual disconnection of three-phase vacuum circuit-breaker in the absence of real-time power supply is made in the form of control levers with return spring interacting with their respective ends with corresponding sections of synchronizing shaft, first and second magnetic circuit releases. Handles of releases are rigidly fixed on one of end surfaces of semi-cylindrical longitudinal bar.

EFFECT: technical result is possibility of detachment of movable contact from fixed contact in each of vacuum arc-quenching chambers with minimum possible forces.

1 cl, 3 dwg