HIGH-VOLTAGE VACUUM CIRCUIT BREAKER Russian patent published in 2009 - IPC H01H33/66 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, particularly to high-voltage vacuum circuit breakers. The high-voltage vacuum circuit breaker contains a frame, a pole terminal with vacuum arc-quenching chambers and isolating rods, shaft, electromagnet with an interleaved core, actuating and tripping coils, armature and permanent magnets. The electromagnet is provided with two latches which hold the armature in two extreme positions due to the effect of the permanent magnets. The armature has two end clearances: one near the left end and the other near the right end. Near one end in the area of the tripping coil there are two more lateral working clearances. Magnetic conductance of the lateral working clearance is several times greater than magnetic conductance of the said end working clearance. Also the vacuum circuit breaker has a tripping spring.

EFFECT: reduction of power consumed by the tripping coil of the electromagnet several times and increased reliability of the circuit breaker.

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