An electrical device comprising: a noise filter connected to an external power supply, to filter noise from the external power entering the device and supplying a driving current to a plurality of loads within the device; and an arc fault detector to detect arc faults from the current flowing through the plurality of loads, characterised in that the arc fault detector includes: a current detector to generate a current detection signal representing a current variation from the driving current; a plurality of High Pass Filter units, HPFs, each arranged to pass a portion of the current detection signal having a frequency equal to, or higher than, a predetermined cut-off frequency for each HPF; a comparison unit arranged to compare a voltage of the passed portion of the current detection signal for each HPF with a predetermined threshold voltage for that respective HPF, to generate a comparison result for each HPF, and to output a comparison signal based on the comparison result; and a controller arranged to detect whether an arc fault has been generated by one of the plurality of loads, by comparing the comparison signal for each HPF with a predetermined stored reference signal characteristic of an arc fault for each respective load, and, when the arc fault is detected, to thereby identify a load having the arc fault from among the plurality of loads, and arranged to control cut-off of power to the load having the arc fault. a noise filter connected to an external power supply, to filter noise from the external power entering the device and supplying a driving current to a plurality of loads within the device; and an arc fault detector to detect arc faults from the current flowing through the plurality of loads, characterised in that the arc fault detector includes: a current detector to generate a current detection signal representing a current variation from the driving current; a plurality of High Pass Filter units, HPFs, each arranged to pass a portion of the current detection signal having a frequency equal to, or higher than, a predetermined cut-off frequency for each HPF; a comparison unit arranged to compare a voltage of the passed portion of the current detection signal for each HPF with a predetermined threshold voltage for that respective HPF, to generate a comparison result for each HPF, and to output a comparison signal based on the comparison result; and a controller arranged to detect whether an arc fault has been generated by one of the plurality of loads, by comparing the comparison signal for each HPF with a predetermined stored reference signal characteristic of an arc fault for each respective load, and, when the arc fault is detected, to thereby identify a load having the arc fault from among the plurality of loads, and arranged to control cut-off of power to the load having the arc fault. a current detector to generate a current detection signal representing a current variation from the driving current; a plurality of High Pass Filter units, HPFs, each arranged to pass a portion of the current detection signal having a frequency equal to, or higher than, a predetermined cut-off frequency for each HPF; a comparison unit arranged to compare a voltage of the passed portion of the current detection signal for each HPF with a predetermined threshold voltage for that respective HPF, to generate a comparison result for each HPF, and to output a comparison signal based on the comparison result; and a controller arranged to detect whether an arc fault has been generated by one of the plurality of loads, by comparing the comparison signal for each HPF with a predetermined stored reference signal characteristic of an arc fault for each respective load, and, when the arc fault is detected, to thereby identify a load having the arc fault from among the plurality of loads, and arranged to control cut-off of power to the load having the arc fault.