The Omron H3Y-4 AC100-120 120S is a socketable mechanical time delay relay from the H3Y series, offering both Off-Delay and On-Delay functions with an adjustable delay window of 5 seconds to 120 seconds set via a hand dial on the top of the relay. Its 4PDT (4 Form C) contact arrangement switches up to 3 A at 250 VAC, making it suitable for controlling multiple loads or signal paths from a single timing event — common in conveyor sequencing, pump alternation, or HVAC staging where one timer governs several contactors.
Supply and mounting
The coil is rated for 100 to 120 VAC, and the relay plugs into a socketable base. Timing is initiated by applying input voltage; the hand dial allows field adjustment without removing the relay from its socket, which saves time during commissioning or retooling.