Patent ID: 7009825
Filing Date: 2006-03-07
Classification: H02H

Abstract:
1. An earth leakage protection device comprising: an input for connecting to a measuring toroid of an earth leakage current, comparison means for comparing a signal representative of said earth leakage current with a reference threshold, processing means to command a trip relay for opening main contacts when an earth leakage fault is detected, rectifying means for receiving at least one signal representative of an earth leakage current, and filtering means comprising a first internal part that comprises two buffer circuits to command a current mirror that references a filtering signal to a power supply line or a reference line, with a resistive element arranged in an integrated circuit, and a second external part with a capacitive element arranged outside said integrated circuit and connected to the internal part by a filtering output, said filtering means, connected to the rectifying means, for: filtering a rectified signal supplied by the rectifying means; and supplying a filtered rectified signal to said comparison means.