What the timer does and where it sits
The Omron H3CR-G8EL AC100-120 is a star-delta timing relay from the H3CR-G series, designed to sequence the star (Y) run-up and delta transition of a three-phase motor starter by holding a contact closed for a programmed interval before releasing the coil that drops the motor back into line. The supply range of 100–120 VAC lets the unit ride directly on a 120 V control transformer secondary common in North American MCC buckets, and the timing window of 0.5 sec to 120 sec covers the typical star-to-delta changeover band where starting transients must settle before full-line connection.
Output contact, socket, and wiring fit
The output is a single SPST-NO (1 Form A) mechanical contact rated 5 A at 250 VAC — adequate to drive the coil of the line contactor that completes the delta connection, but the 5 A ceiling means the unit belongs in the control circuit, not in the power path of the motor itself. Termination is an 8-pin octal plug-in, and the unit is socketable so a failed timer pulls straight out of its base without disturbing the rest of the starter wiring — the practical advantage on a hot starter swap where downtime is the dominant cost.
Timing adjust and initiation
Timing initiate is keyed to input voltage, so the star interval starts the moment the coil sees line potential — no separate trigger terminal to wire. The delay is set with a hand dial on the front face, which is the field-friendly choice when commissioning techs need to trim the star interval against a real load without a programming tool.