What the H3Y-4-B DC24 120S does on the panel
The Omron H3Y-4-B DC24 120S is a solid-state plug-in timer from the H3Y line, built around a 4PDT contact set with a 120 s timing range on a DC24 V supply — the right fit when a control sequence needs four independent poles switching together off one timing element, with the time base set short enough for machine-cycle interlocks rather than long process delays.
Lifecycle read on a mature but active line
Mature-and-active is the right shape for a critical spare: the part is not aging out next quarter, but the install base running it is, so the cabinet stock call is to keep one in the drawer against the timer that has been bouncing relays for a decade — the failure mode the spares buyer is hedging is the timer itself, not the supply.
Packaging and how it ships
The H3Y-4-B DC24 120S ships in bulk pack, which is the panel-builder configuration — multi-unit quantities for cabinet builds and spare stocking, not the single-unit retail pack used for bench prototyping.