What this relay is and the BOM-fit decision
The Omron G6S212VDC is a DPDT signal relay from the G6S series, with a 12 VDC coil — a common pick for switching low-level signals in control panels, PLC output isolation, or interface circuits where the board space is tight and the load is light.
Coil voltage and contact configuration
The 12 VDC coil voltage matches standard 12 V control supplies found in many industrial and telecom panels — no extra DC-DC converter or dropping resistor needed if your rail is already 12 V. DPDT (two Form C) contacts give you two independent changeover circuits in one package, which is useful for switching both the signal and its return, or for driving a pilot light plus a logic input from the same relay.