Electrical installation protecting device, has connecting unit with electrode placed at level of mobile stud, so that unit passes lightning current formed between electrode and fixed contact stud, to ground when stud occupies open position

摘要

The device has a control unit controlling a displacement unit (10) to place a mobile contact stud (8) in its open position when a storm activity exceeds an alarm level. A connecting unit (20) connected to ground has an electrode (21) placed at a level of the stud (8), such that the unit (20) passes lightning current established between the electrode and a fixed contact stud, to the ground when the stud (8) occupies the open position.