The arc detecting point sensor A1000 is installed in switchboards in such a way that it has a line-of-sight to all powered connections, where an arc can develop. Typically, each compartment will have one or two sensors. The sensor is able to detect light from all angles in front of it due to the specially shaped cylindrical lens on the front of the sensor. The detection radius is dependent on the arc power. At a trip level setting on the D1000 of "1", the A1000 will react to all arcs of more than 3 kA within a 2 meter radius.