5ST3021-0HG SIEMENS

The 5ST3021-0HG is a fault signal contact designed by Siemens, specifically engineered for use with miniature circuit breakers (MCBs) that adhere to the UL 489 standard. This auxiliary component provides essential remote signaling capabilities, indicating the operational status of the associated MCB. Featuring two normally open (2 NO) contacts, the 5ST3021-0HG allows for the transmission of fault signals to monitoring systems or control circuits. When the MCB trips due to an overload or short circuit, the fault signal contact changes state, providing a clear indication of the fault condition. This enables prompt identification and resolution of electrical issues, enhancing system reliability and safety. The compact design of the 5ST3021-0HG ensures easy integration into existing electrical panels and systems. Its robust construction guarantees reliable performance in demanding industrial environments. By providing real-time fault indication, this accessory contributes to reduced downtime and improved maintenance efficiency. It is an indispensable component for comprehensive circuit protection and monitoring.