DRAWER-TYPE VACUUM CIRCUIT-BREAKER

摘要

PROBLEM TO BE SOLVED: To provide a truck-type vacuum circuit-breaker capable of demonstrating the locking function to any possible misoperation. SOLUTION: A locking part comprising a perpendicular part 6a and an arc- shaped part 6b is formed to a lower part of a lever 6 fixed to a main shaft 5. A tip part 4a is formed on a locking piece 4 fixed to a lower part of a locking bar 14, and the tip part 4a is fixed to the locking bar 14 so that the upper end of the tip part of the locking piece 4 is located rearward of the lower end of the perpendicular part 6a of the lever 6 when a vacuum valve 13 is in the open condition where the lower end of the locking bar 14 is fitted to a locking hole in a locking plate 16. Even when the lever 6 is oscillated through the closing action, a lower end face of the arc-shaped part 6b is opposite to the upper end of the tip part 4a with a slight clearance in between, and the locking bar 14 is not moved upward.