20090323242 | DISCONNECTOR AND OVERVOLTAGE PROTECTION DEVICE - An object of the present invention is to provide a disconnector that satisfies applying a lightning surge current, blocking a follow current, being capable of short circuit breaking, and being compact in size and an overvoltage protection device combining the disconnector with overvoltage protectors. The disconnector of the present invention comprises: a current transformer that detects a current flowing through electric wires; a rectifying part that rectifies the current outputted from the current transformer; a charging part that charges the current outputted from the rectifying part; a switching part that disconnects the electric wires upon driving; and a trigger part that drives the switch when the charge stored in the charging part becomes a predetermined drive area. In this regard, the drive area is set larger than the charge that can be stored in the charging part by a lightning surge current. The disconnector of the present invention and the overvoltage protectors may be combined to constitute the overvoltage protection device. | 12-31-2009 |