The ABB E1N1600 R400/800/1600 3/4P is a high-performance modular motor protection circuit breaker (MPCB), designed for use in industrial and commercial applications. It is part of the SACE E1N series and is primarily intended to protect motors, transformers, and other electrical systems from various fault conditions such as overload, short-circuit, ground faults, and thermal damage. This model offers a flexible configuration and can be used in both three-pole (3P) and four-pole (4P) systems, making it suitable for a variety of electrical network types.