What the H3CR-G8EL-31 does in a star-delta starter
The Omron H3CR-G8EL-31 AC100-120 is a star-delta timing relay from the H3CR-G series, sitting in the Electronic Timers & Counters category and built to coordinate the open/closed transition between the star and delta contactor stages of a reduced-voltage motor start. With a delay range of 0.5 Sec to 120 Sec set by the hand dial on the front face, it gives the panel builder a single knob to tune the changeover window for the motor's load and inertia profile. The output is a mechanical relay in SPST-NO (1 Form A) configuration, rated 5 A at 250 VAC — sized to drive the auxiliary coil of a downstream star or delta contactor, not the motor itself. Timing is initiated by input voltage, so the relay starts its cycle the moment the line is energized and drops the star contactor out at the end of the timed window.
Supply, socket, and panel-side wiring
Supply is 100 to 120 VAC, matching the standard North American control transformer secondary used in motor control panels. The unit terminates as a plug-in 8-pin (octal) base, and the socketable mounting style means the timer body unclips from the base for swap-out without disturbing the wired terminals — a clean MRO posture for a part that may need replacement mid-life. That octal pinout is the H3CR-G family's standard footprint, so a field replacement of this timer does not require rewiring the socket when the replacement is another H3CR-G variant or a pin-compatible timer in the same series.
Sourcing posture for this mature line
Lifecycle is listed as Active with a mature stage — the part remains in current Omron production rather than being phased out, and the H3CR-G series continues to be quoted against panel-builder BOMs. No official successor or second-source cross-reference is on the record for this exact order code.