The ABB E1N800 R400/630/800 3/4P is a motor protection circuit breaker (MPCB) designed for low-voltage protection in industrial electrical systems. This model belongs to the E1N series of circuit breakers, offering comprehensive overload, short-circuit, and ground fault protection for motor-driven systems, transformers, generators, and other critical electrical equipment. The E1N800 is available in a range of current ratings (from 400A to 800A) and can be used in three-pole (3P) or four-pole (4P) configurations, making it suitable for a variety of industrial applications.