CURRENT SUPERVISORY DEVICE WITH RELIABLE EVENT REPORTING

A current supervisory device includes current sensing means for sensing a current; a circuit arranged to convert a signal received from the current sensing means into a signal indicative of the sensed current; a processing circuit arranged to receive the signal indicative of the sensed current, to detect an event based on the received signal such that the detecting yields an outcome corresponding to one of at least two different states, and to generate an event signal in accordance with the outcome, such that the processing circuit has modulation means for performing modulation based on the event signal; and an output terminal arranged to output a reporting signal received from said processing circuit, whereby at least one of at least two different states gives rise to the reporting signal being a modulated signal.