What the H3Y-4 DC24 5S is and what it switches
The H3Y-4 DC24 5S is an Omron H3Y-series mechanical-relay timer, a 4PDT (4 Form C) package that combines on-delay and off-delay functions on a single socketable plug-in body, with a 24 VDC coil supply. Four form-C poles in one timer means a single DIN-rail socket drives up to four independent switched circuits from the same timing event — useful when a sequence needs to drop a contactor and light a stack lamp and energize an alarm horn from the same initiating edge. Timing is set with a hand dial across 0.2 sec to 5 sec, initiated by input voltage, so the field technician dials the delay without a programming tool. Contact rating is 3 A at 250 VAC — adequate for pilot-duty loads (coils, small contactors, indicator lamps) but not for direct motor switching. The plug-in termination means the timer body pulls out of its base for replacement without disturbing the panel wiring.
Lifecycle posture and sourcing channel
Omron lists the H3Y-4 DC24 5S as active in the lifecycle record, with a mature production stage indicating a long-running catalog line rather than a new release. For an MRO spare or a small panel build, this posture keeps a known timing part available without committing the buyer to a redesign.