5ST3021-2 SIEMENS

The 5ST3021-2 from Siemens is a fault signal contact designed to enhance the functionality of your miniature circuit breakers (MCBs) and residual current circuit breakers with overcurrent protection (RCBOs). This device provides a reliable method for signaling fault conditions, ensuring prompt awareness and response to electrical issues. Equipped with both a test and acknowledgment key, the 5ST3021-2 allows for convenient testing of the fault signaling functionality and confirmation of fault resolution. It features two normally open (NO) contacts, which close upon detection of a fault, providing a clear signal to monitoring systems or control circuits. This fault signal contact is compatible with Siemens miniature circuit breakers 5SL, 5SY, and 5SP, as well as RCBO 5SU1 and FI 5SV. For seamless integration with the 5SU1 series, the handle coupler 5ST3805-1 is required, ensuring a secure and reliable connection. By integrating the 5ST3021-2 into your electrical system, you gain enhanced monitoring capabilities, enabling faster response times to faults and improved overall safety. Its robust design and compatibility with a range of Siemens circuit protection devices make it a versatile and valuable addition to any electrical installation. This device is essential for applications where immediate fault detection and notification are critical.