Siemens 3RH1911-1FC22 Auxiliary Switch Block

The auxiliary switch block, also known as auxiliary contact block or additional switch, is an electrical switching device from the field of switches. It comes from the manufacturer Siemens with type number 3RH1911-1FC22. This block is equipped with a contact configuration of 2 normally open (NO) and 2 normally closed (NC) contacts (2SV+2ON / 2NOP+2NCD). The device has dimensions 10 x 5 x 5 cm and weighs 0.06 kg. Auxiliary switch blocks are used to extend the functionality of main switches or contactors by providing additional switching points for control, signaling, and interlocking tasks. They find typical applications in machine control in automation technology, for monitoring operating states in industrial plants, and for realizing safety functions in electrical circuits.

2SV+2ON / 2NOP+2NCD