Siemens 3RH2911-1FC22 Auxiliary Contact Block

Siemens 3RH2911-1FC22 Auxiliary Contact Block is a front-mounted signaling accessory for Siemens SIRIUS equipment, compatible with 3RT2 contactors and 3RH2 relays. It provides four auxiliary contacts—two normally open (NO) and two normally closed (NC)—wired through front-side screw terminals and presented in a compact 22 U width. When installed, this block adds signaling capacity without carrying the main power path, enabling separate control or feedback signals in automation systems. The two NO and two NC contacts allow monitoring of both energized and de-energized states, supporting logic inputs, interlocks, and status signaling in machine control and automation architectures that use Siemens 3RT2/3RH2 assemblies. In short, the 3RH2911-1FC22 is the front-accessory solution for expanding the signaling capability of compatible Siemens contactors and relays.