Auxiliary switch, front-mounted, 1 NO, 71/72, current circuit: 1 NO, top cable entry, screw connection, for contactors 3RT2 and auxiliary contactors 3RH2. Auxiliary switch SIRIUS 3RH29 for expanding auxiliary contacts in the control circuit. The front-mounted auxiliary switches 3RH29 can be installed on contactors 3RT2 and auxiliary contactors 3RH2 without tools, regardless of size. The auxiliary switches 3RH19/3RH29 are available as front or side-mounted variants, with up to four instantaneously switching normally closed or up to two early switching 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-loaded connections. Simple, efficient, always up to date - the SIRIUS system modular concept.