Siemens Industrial Controls 3RH1921-1DA11 Auxiliary Contact Block Side Mount N/O & N/C

The Siemens Industrial Controls 3RH1921-1DA11 Auxiliary Contact Block is an essential component of an HVAC systems. It expand contactors, relays, and circuit breakers by offering extra switching capabilities. This block is useful in systems and there is a need to switch and regulate the flow of electrical current to systems such as compressors, fans, and heaters. It also contributes to the improvement of the efficiency of these systems when integrated into them. The advantages of using this auxiliary contact block are flexibility in designing the system, better performance, and efficiency.