Auxiliary switch, front-mounted, 1 S, circuit: 1 S, screw connection, for contactors 3RT2 and auxiliary contactors 3RH2. Auxiliary switch SIRIUS 3RH29 for expanding the auxiliary contacts in the control circuit. The front-mounted auxiliary switches 3RH29 can be installed without tools, regardless of size, on the contactors 3RT2 and auxiliary contactors 3RH2. The auxiliary switches 3RH19/3RH29 are available as front-mounted or side-mounted variants, with up to four instantaneous closing or up to two early-opening 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 available with screw connection and spring-loaded connection. Simple, efficient, always up to date - the SIRIUS system modular kit.