The unit D0500 is designed to connect up to 8 detectors in parallel and has a separate indication of which detector(s) caused tripping by means of a red LED for each detector. The red LED is lit when the light intensity exceeds 6.000 lux. on the detector, but it turns off again if the intensity goes below 6.000 lux. At 12,000 lux. the Arc Detecting Relay is triggered, the active LEDs are latched and a yellow LED (TRIP) is turned on. All LEDs remain turned on until reset by a common RESET button. Max. 2 boxes per arc detecting relay are allowed.