Siemens 3RH1911-2FA31 Auxiliary Switch Block

The auxiliary switch block, also known as a switching module or contact block, from Siemens with type number 3RH1911-2FA31 is an electrical switch for control and signaling functions in switchgear. It features a configuration of three normally open (NO) and one normally closed (NC) contacts and complies with the GB14048 standard for 5/50Hz systems. It has the dimensions 10 x 10 x 5 cm and weighs 0.06 kg. Auxiliary switch blocks extend the functionality of main switches or contactors with additional control contacts and serve to transmit switching states and control auxiliary functions. Typical applications are found in automation technology, mechanical engineering, process control, and power distribution systems for monitoring and controlling processes.

3S+1O / 3NO+1NC GB14048 5/50Hz