EARTHING SWITCH INTERLOCK DEVICE OF VACUUM CIRCUIT BREAKER

摘要

PROBLEM TO BE SOLVED: To provide an earthing switch interlock device of a vacuum circuit breaker, which prevents a main unit of the vacuum circuit breaker from being pulled in or being pulled out interlocking earthing operation of the earthing switch.

SOLUTION: The earthing switch interlock device of the vacuum circuit breaker includes: a drive spindle 20 for pulling in or pulling out of the main unit of the vacuum circuit breaker; a movable plate 40 prepared with a connection hole 40a for an operation handle 70 for turn-driving the drive spindle, the movable plate 40 being capable of moving to an operation handle connection allowing position which allows a drive connection of the operation handle to the drive spindle and an operation handle connection disallowing position which disallows the drive connection of the operation handle to the drive spindle; a first interlock plate 50 coupled to the movable plate, capable of moving so as to move the movable plate between the operation handle connection allowing position and the operation handle connection disallowing position; and a second interlock plate 60 capable of moving between a position at which the second interlock plate restrains the first interlock plate at the operation handle connection disallowing position when the earthing switch 88 is in the earthing state and a position at which the second interlock plate releases the first interlock plate from the restraint when the earthing switch is not in the earthing state.

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