GHISALBA devices base their operating principle on magnetic attraction, ensuring very fast response times compared to other solutions on the market, all of which is intrinsically guaranteed with opening not only through the use of a stop or emergency button but also automatically in the event of a fault, burnout of the power coil or attempted tampering. Thanks to the use of an auxiliary mirror contact integral with the device and not removable, the "mirror contact" via remote signaling, even in the event of a fault, you always have a safe indication of the status of the power contacts