ARRANGEMENT FOR SAFELY REMOVING OVERVOLTAGE PROTECTION DEVICES FROM THE MAINS, INDEPENDENTLY OF SWITCHGEAR OR BACKUP FUSES, IN THE EVENT OF CRITICAL OPERATING STATES

摘要

The invention relates to an arrangement for safely removing overvoltage protection devices from the mains, independently of switchgear or backup fuses, in the event of critical operating states, particularly transition of the overvoltage protection device to a fault or overload state, consisting of a device for sensing the current flowing through the overvoltage protection device and a switching apparatus connected in series with the overvoltage protection device. According to the invention, the device for sensing the current flowing through the overvoltage protection device is in the form of a toroidal coil with or without a ferromagnetic core, which toroidal coil is designed such that fault currents of medium amplitude, which differ from event-dependent surge currents, are detectable. The toroidal coil is electrically connected to an indicator device or a similar means, the indicator of which is mechanically connected to the switching apparatus in order to trigger same.