Siemens 3RH2911-1HA13 Auxiliary Switch Block

The auxiliary switch block from Siemens, also known as auxiliary contact module or signaling contact block, is an electrical switching device from the category of switches, with type number 3RH2911-1HA13, which serves to extend switching functions in electrical systems. It has the dimensions 10 x 10 x 5 cm and weighs 0.06 kg. Auxiliary switch blocks are used to add additional switching contacts to main switches, contactors or motor protection switches, thereby enabling the implementation of control, signaling and interlocking tasks. Typical applications include industrial automation for process control, mechanical engineering for safe operational monitoring, and power distribution for signaling switching states.