The auxiliary contact OF/SD for the NSX molded case circuit breaker is designed to monitor the breaker’s status and provide remote signaling. The OF (Open/Fixed) contact indicates whether the breaker is in the open (OFF) position, while the SD (Switch Disconnected) contact signals a tripped state due to a fault or manual operation. These contacts are essential for automation and control systems, enabling real-time feedback on the breaker’s condition for safety and operational efficiency.

Typically used in electrical distribution panels, the OF/SD contacts integrate with alarm systems, PLCs, or SCADA systems to enhance fault detection and maintenance coordination. Their compact design ensures easy installation on NSX breakers, supporting applications in industrial, commercial, and infrastructure projects where reliable circuit monitoring is critical.