The D0700 is a 3-phase current relay to be used in combination with a DC arc detecting relay. The current setting range is 1.5-3.0xIn (7.5-15A). Each time the set current is exceeded a red LED (TRIP) turns on and an output relay activates. The relay contact - normally closed - opens and cancels the blocking of the arc detecting relay making it able to trip the supply breaker in the case of an arcing fault. The function of the arc detecting relay is thus made dependent on the current at the time of the arcing fault. However arcing time is increased.