1. 3NE1 021-0 is an electronic protection relay developed by Siemens. It is used mainly for protection and monitoring of medium-voltage power supplies in industry and utilities. This versatile device offers three single-phase and four multi-phase settings, providing maximum flexibility for the user.
2. It has versatile control modules that are configurable via PC or laptop. It also uses a modular concept with interchangeable function blocks. This enables the user to expand or reconfigure it to any type of application.
3. Its main features include integrated measurement and monitoring functions such as: Over-currents, Earth-leakages, Out-of-step protections, Over-loads, Reactive power, to name a few. 3NE1 021-0 is commonly used in substations, power plants and factories.