Electronic circuit ensuring protection against electrical discharge, in particular for hairdryers

Abstract From the Canadian patent

This invention relates to an electronic control circuit ensuring protection against short-circuiting and especially against electrical discharge in particular in, domestic electrical appliances such as hairdryers. This circuit comprises a pair of parallel, slightly spacedapart metal sensing grids disposed in correspondence with each aperture of the appliance, and an electronic control and tripping circuit which maintains energized a relay for closing a switch connected into the electricity feed line. Each of the two grids is connected to the electronic control and tripping circuit by a pair of conductor wires through which a supplementary control current constantly circulates, accidental …