Auxiliary switch, front-mounted, 2 NO, 1/2, 1/2, current circuit: 1 NO, 1 NO, screw connection, for contactors 3RT2 and auxiliary contactors 3RH2. SIRIUS auxiliary switch 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 in front-mounted or side-mounted versions, with up to four instant switching normally open or up to two early switching normally closed contacts. The auxiliary switches can be designed as positively driven 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 concept.