ABB OVRT23N40-550PU Overvoltage Relay

The OVRT23N40-550PU Overvoltage Relay is a protection device that detects abnormal voltages and trips its relay to shield connected equipment from surge damage, helping prevent insulation breakdown, overheating, and premature failure in sensitive drives and controllers. In typical installations, it sits in control panels, motor drives, and switchgear to continuously monitor supply voltages, coordinate with upstream protection, and execute protective actions when voltages stray beyond preset limits; the unit includes a relay contact output that can be wired to interrupt power, drive an alarm, or interface with a PLC input to trigger a safe shutdown. As part of the OVRT family, the device relies on a voltage-sensing input compatible with common industrial voltage ranges and is designed for rapid response to overvoltage events, with a clear status indication to simplify diagnostics during startup or fault conditions. Common applications span drive protection in motor control centers, protection of programmable logic controllers and other automation assets, and protection of cabinet power supplies in manufacturing and process industries; when selecting this model, ensure your system matches its voltage range, response behavior, and safe-reset options to maintain continuous operation and protect critical equipment.