Auxiliary switch on the front side, 2 S + 1 Ö power circuit 1 Ö, 1 S, 1 S for 3RH2 and 3RT2 spring terminal connection. Auxiliary switch SIRIUS 3RH29 for expanding the auxiliary contacts in the control circuit. The front-mounted auxiliary switches 3RH29 can be installed on the contactors 3RT2 and auxiliary contactors 3RH2 without tools, regardless of size. The auxiliary switches 3RH19/3RH29 are available as front-mounted or side-mounted variants, with up to four instant switching or up to two early switching normally closed and normally open contacts. The auxiliary switches can be designed as forcibly guided contact elements in auxiliary contactors 3RH or as mirror contacts in power contactors 3RT. They are continuously available with screw connections and spring terminal connections. Simple, efficient, always up to date - the SIRIUS system modular system.