The Omron G7Z-3A1B-11Z-R DC24V is a safety relay with a 3PST/SPST contact arrangement — three normally-open safety channels and one normally-closed monitoring channel, all switched by a 24 VDC coil. That contact count suits it for dual-channel emergency-stop or guard-door circuits where the feedback loop needs a separate NC path back to the safety controller.
This relay carries a mature lifecycle status — the manufacturer continues to produce it, but the part has been on the market long enough that a buyer should confirm the current lead time before committing a BOM line.
Integration notes
Mounts on a DIN rail in the control panel. The 3PST/SPST contact set is fixed — no field-convertible contacts — so verify the safety circuit topology before wiring. The 24 VDC coil draws its nominal current from a standard 24 VDC power supply; coil suppression is internal on the G7Z series, so no external flyback diode is needed across the coil terminals.