The BW9W1SG0-R is an auxiliary switch designed for Fuji Electric's G-TWIN series molded case circuit breakers (125, 160, and 250 AF frames). This low-level circuit auxiliary switch is configured for right-side mounting with a terminal block system connection, enabling remote monitoring and signaling of breaker status. It integrates seamlessly with the BW125, BW160, and BW250 breaker frames to provide auxiliary contact functionality for control circuits and alarm systems. The switch is commonly used in industrial power distribution systems where circuit breaker status indication and remote control integration are required.