The ABB S800-AUX/ALT is a versatile auxiliary and signal/alarm contact designed as a key accessory for the S800 series of high-performance miniature circuit breakers (MCBs). This unit provides reliable remote indication of the circuit breaker’s status, signaling whether it is in the ON, OFF, or tripped position. It can be configured as either an auxiliary contact (AUX) to show the main contact position or as a signal/alarm contact (ALT) to indicate a trip event. Ideal for integration into automation and control systems, the S800-AUX/ALT enhances system monitoring and safety by providing crucial feedback for PLCs, control panels, and building management systems. It is designed for easy, tool-free mounting to the side of an S800 MCB, ensuring a secure and efficient installation.