ILS120-ON ON Switcher, 120V-15AThe iLS120 ON On Switcher directional relay is useful for adding equipment to augment a process like heating or cooling. It allows you to add additional equipment exceeding the controller load capacity: the equipment is simply activated when the current is active at the controller output. The iLS120 ON turns on the equipment when the relay sense cord detects that the control output is powered. No adjustments to makejust plug the iLS120 ON on a circuit