The 6SY7000-0AC23 is part of the SIPROTEC 4 range of protection products from Siemens. It is a digital protection relay designed to protect low and medium voltage power systems. It offers a wide range of protection features and functions, including voltage and current measurement, short-time delay, short-circuit protection, fault ride-through, overcurrent and over-/undervoltage protection, and differential protection. It can be used with a variety of communication protocols, including Profibus, ModBus, and OPC. The 6SY7000-0AC23 is suitable for applications such as transformer, motor, generator, capacitor, and network protection.