Siemens 3RH1921-1FA22 Contact Block

The contact block, also known as an auxiliary contact block or switching module, from Siemens with type number 3RH1921-1FA22 is an electrical switching module for contactors from the auxiliary contactor category. It serves to extend the switching functions in control circuits and features a configuration of 2 normally open (NO) and 2 normally closed (NC) contacts. The device has the dimensions 4 x 4 x 5 cm and weighs 0.065 kg. Contact blocks enable the provision of additional switching points for signaling and controlling auxiliary circuits in industrial switchgear and machines. Typical application areas include automation technology, mechanical engineering, and building automation for the flexible design of complex control solutions.

2O + 2S