| 摘要 |
<p>An arrestor (10) is accommodated in an insulating housing (12) containing a voltage-surge limiter (14) with varistors, a disconnection device (16) with contacts (18, 20) actuated by a mechanism (22) with handle (46), and a disengagement circuit rendered active at the end of the lifetime of the varistors in order to disconnect the arrestor (10) from the network. The handle (46) co-operates with a cover (90) so as to be accessible in the disengagement position, and inaccessible in the engagement position, allowing delivery of the arrestor in the primed state of the mechanism (22) and in the position of disengagement of the handle (46). The arrestor (10) is placed in service at the time of installation in order to prevent an untimely disconnection during transportation. The mechanism (22) memorises the automatic disengagement in order to ensure an irreversible disconnection should the varistors be destroyed. <IMAGE></p> |
