Littelfuse 201A-AU 3-Phase Plug-In Volt Mon/ 190-

The Littelfuse 201A-AU is a three-phase voltage monitoring relay that protects electrical equipment against voltage imbalances, overvoltages, and undervoltages. It operates by constantly checking the voltage levels in each of the three phases of an AC power source. To prevent harm to delicate equipment, the relay disconnects the power or sounds an alert if any phase voltage deviates above predetermined thresholds. The 201A-AU has various advantages and is commonly utilized in big HVAC systems and industrial applications. Its plug-in, small form makes installation easier, and its broad operating voltage range of 190-480 VAC guarantees power source compatibility. Trip settings that may be changed to suit particular equipment requirements are possible, and tripping hazards can be avoided with the use of adjustable time delays. The relay improves overall system uptime and dependability by offering LED indicators for easy status monitoring.