In a boiler‑room control panel, the additional switch is wired to the main circuit breaker and to the plant’s supervisory system. When the breaker trips, the switch closes a dry circuit that feeds a visual alarm and triggers a remote shutdown command for upstream pumps. This simple action isolates the fault, prevents cascading failures, and gives operators immediate status feedback without drawing power from the high‑voltage line. The same device is used in chemical reactor safety loops, where it links a pressure‑release valve to the central PLC; the valve’s movement opens the switch, which then logs the event and initiates an emergency venting sequence. Because the switch provides a reliable, non‑powered signalling point, it can be installed in hazardous zones and in cabinets that are frequently accessed for maintenance. Its presence lets plant engineers monitor critical interlocks from the control room, schedule preventive maintenance only when the status changes, and keep production running with minimal unscheduled stops.