The Omron H5S-YB2D-X is a panel-mount programmable time delay relay with two SPST-NO (1 Form A) outputs, each rated for 15 A at 250 VAC. It runs on a 24 VDC supply and covers a delay range from 1 minute up to 1 year, adjusted via up/down digit keys. The timing initiate method is input voltage — apply the supply and the programmed delay starts.
The 15 A contact rating at 250 VAC covers most resistive and moderate inductive loads found in panel-level control — pilot lights, contactor coils, solenoid valves, small heaters. It's a mechanical relay, so it handles inrush without the leakage or heat-sinking constraints of a solid-state timer. The 1-minute to 1-year delay range is unusual: most industrial timers top out at hours or days, so this part fills the niche for long-cycle processes like batch chemical dosing, HVAC defrost schedules, or irrigation sequencing where a PLC timer would need a separate RTC module. The 24 VDC supply is common in modern control cabinets; just watch that the coil dropout threshold stays below 18 V to avoid nuisance reset on a sagging bus.