Earth leakage protection device and electrical switchgear unit comprising such a device

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.