The EW100EAGU-3P090B is a 3-pole earth leakage circuit breaker (ELCB) designed for line protection in electrical distribution systems. It features a 100 A breaker ampere frame with a 90 A rated current and is UL489 listed for North American applications. The device supports multiple mounting and connection options including blank, D, and K configurations, providing flexibility for various installation requirements. It operates within the G-TWIN series standard for earth leakage protection and is suitable for industrial and commercial electrical systems requiring reliable ground fault detection and circuit interruption.