The H3Y4120SDC12 is a time-delay relay manufactured by Omron. It is a 240V AC model that has 4PDT (4-pole double-throw) contact configuration. This relay can be used to control an electrical circuit, turning it off and on in either a timed (delay on) or continuous (drop-out) mode. The H3Y-4120-SDC12 features an adjustable range (from 0.1 seconds to 1 hour) and an adjustable repeat cycle (from 0 to 199). The relay also has an LED indicator to show the state of the output.