What the H3Y-2-B actually does in a panel
The Omron H3Y-2-B AC100-120 30M is a socketable, plug-in time-delay relay from the H3Y series, built around a mechanical DPDT (2 Form C) contact set that switches loads up to 5 A at 250 VAC. It covers both Off-Delay and On-Delay functions in a single unit, with a 1 min to 30 min timing window set via a hand dial on the front face, and timing initiated by the input voltage on its 100–120 VAC supply.
Contact rating and timing envelope
5 A at 250 VAC on the DPDT output is the load ceiling for resistive and lightly inductive duty — the mechanical relay contacts are rated for that figure at 250 VAC, so any pilot or small contactor coil switched through this timer must stay under the 5 A figure. A 1 to 30 min window with hand-dial adjustment means the dial position sets the delay directly; there is no digital readout to chase. For an existing machine logic retrofit where the original timer had a 30 min mechanical dial, this part drops into the same socket and preserves the operator-facing adjustment feel.
Lifecycle and how it is sourced
The H3Y-2-B AC100-120 30M sits at a mature stage in its product life and is listed as active — the classic profile of a long-running Omron timer that established lines still spec into replacement builds. Because it is socketable, field swap on a failed unit is straightforward: pull the old timer out of its 8-pin (or matching) socket, seat the replacement, restore the dial setting, and the line is back.