Residual current device, which functions on a magnetic tripping principle based on electronic measuring, and which comprises a measuring winding, measuring electronics, a main switch with knob part, a trip coil, a permanent magnet, and a testing and reset contact for residual current protection as well as device-status indication, and an integrated main switch-trip part (301-315) of the residual current device provided with a metallic shaft (308) traveling through the trip coil (303), and a permanent magnet (306) arranged below the shaft, which main switch is simultaneously a contact that opens in a residual current protection situation, which main switch-trip part comprises integrated means, with which it is arranged to function also as a reset switch and testing switch, which means comprise an integrated trip module for bringing about testing/resetting in connection with the knob part (301) as well as a swivel (314) for turning the knob part.