Handle lock device of circuit breaker
A circuit breaker has at least two handle lock screw engagement portions to which a handle lock device is attached formed on a case at positions different from a position of an attachment screw for integrating a case including a plurality of divided bodies. The handle lock device has at least two attaching screws disposed, the attaching screws engaging with the handle lock screw engagement portions of the circuit breaker and attaching the handle lock device at a regular position on the circuit breaker. The handle lock device has a handle locking portion disposed, the handle locking portion restricting the knob portion from moving to an ON position even when the attaching screws are incorrectly attached to the handle lock screw engagement portions.
1 . A handle lock device of a circuit breaker, the handle lock device locking a knob portion of a rocker-type open-close operation handle projecting from an upper portion of a case of the circuit breaker to an OFF position, wherein the circuit breaker has, at positions different from a position of an attachment screw for integrating the case including a plurality of divided bodies, at least two handle lock screw engagement portions to which the handle lock device is attached are formed on the case, the at least two handle lock screw engagement portions include a first handle lock screw engagement portion and a second handle lock screw engagement portion, the handle lock device comprising:
at least two attaching screws including a first attaching screw and a second attaching screw, the first and second attaching screws engaging with the first and second handle lock screw engagement portions of the circuit breaker and attaching the handle lock device at a position on the circuit breaker;
a first handle locking portion restricting the knob portion from moving to an ON position when the first attaching screw is attached to the first handle lock screw engagement portion;
a second handle locking portion restricting the knob portion from moving to the ON position when the second attaching screw is attached to the first handle lock screw engagement portion;
a lock base including the attaching screws and the second handle locking portion and attached on an upper portion of the case,
wherein the first handle locking portion including a handle lock plate connected to the lock base in a freely rotatable manner and configured to move to a position at which the handle lock plate restricts the knob portion from moving to the ON position regardless of whether the attaching screws are correctly attached to the handle lock screw engagement portions; and
a lock plate holding member connected to the lock base in a freely rotatable manner and configured to, by being locked with a padlock, restrain movement of the handle lock plate restricting the knob portion from moving to the ON position.
2 . The handle lock device of the circuit breaker according to claim 1 , wherein
the lock base includes a pair of first frames extending in parallel with each other and a pair of second frames connecting the pair of first frames to each other, and
the second handle locking portion is a handle locking protrusion that protrudes from one of the first frames toward an opening portion of the lock base.