control signal s 1 issued by the micro controller 5 the switch circuit 3 further comprises a bypass switch element 32 that is connected between the second power line l 2 and the second terminal 12 of the load 1 whereby the bypass switch element 32 is connected in parallel to the solid state switch 31 and the filter circuit 2 the bypass switch element 32 is also coupled to the micro controller 5 and is controlled by a bypass switch control signal s 2 issued by the micro controller 5 when the bypass switch element 32 is closed electrical power from the power source acv is supplied to the load 1 via the bypass switch element 32 and the solid state switch 32 and the filter circuit 2 do not function fig2 shows an embodiment of the solid state switch 31 and waveforms of the power side voltage v 1 and the load side voltage v 2 associated with the solid state switch 31 of fig2 are shown in fig3 in the embodiment illustrated in fig2 the solid state switch 31 comprises a triac 311 functioning as a switching element the triac 311 receives the switch control signal s 1 from the micro controller 5 and the conducting angle u03b8 of the triac 311 is controlled by the switch control signal s 1 whereby.