UL Certification. LEDO - ON Delay Timer Relay. Delay On Operate, Multi-voltage timer LEDO in a 17.5mm DIN rail housing. Supply initiated Delay On Operate timing function. 7 selectable time ranges. Fine adjustment of selected time range. Multi-voltage input. Green LED indication for supply and timing status. Red LED indication for relay status. 17.5 mm width. DIN rail mounting