The ABB E3S2000 R2000 PR121/P-LSI 3P is a motor protection circuit breaker (MPCB) designed for high-power motor protection and electrical circuits in industrial and commercial environments. This model is part of ABB's E3S series and provides comprehensive protection for three-phase electrical systems. It is particularly suitable for motors, transformers, and other critical equipment, offering protection from various fault conditions such as overload, short-circuit, ground faults, and thermal damage.