Siemens 3RH2911-1FA04 Auxiliary Switch Block

The auxiliary switch block, also known as auxiliary contact block, additional switch, or switching module, from manufacturer Siemens with type number 3RH2911-1FA04 is an electrical switch for extending the functionality of main contactors or circuit breakers. It has the dimensions 10 x 10 x 5 cm and weighs 0.06 kg. Auxiliary switch blocks serve to provide additional switching contacts for control and signaling purposes without affecting the main current circuits. Typical applications are found in control technology, complex automation systems, and in mechanical and plant engineering for signaling switching states.