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