What this part is on the BOM
The G7L-1A-T 100/120AC is the Omron G7L-series general purpose relay specified with a 100/120 VAC coil, sitting in the General Purpose Relays line of the catalog. On paper this is a power relay used to switch heavier AC loads than a signal relay can handle — heating elements, motor contactors, lighting banks — while keeping the control side on a low-power 100/120 VAC coil fed from a control transformer or a phase leg of the same panel.
Mature lifecycle stage, no PCN on record
The listing marks as mature, which means Omron is still shipping but the part is no longer a new-designation favorite — long-term spares and maintenance stock are the realistic use case, not a greenfield design-in. No official L*-coded successor or cross-reference appears in the ledger, so any swap to a newer G7L variant has to be confirmed against the coil voltage, contact form and pin footprint rather than treated as a guaranteed drop-in.