Auxiliary switch, side-mounted, 1 NC + 1 NO, Left: 41/42, 53/54, Right: 21/22, 33/34, Current path: 1 NO, 1 NC, spring-loaded connection, for contactors 3RT2.1. SIRIUS 3RH29 auxiliary switch for expanding auxiliary contacts in the control circuit. The side-mounted auxiliary switches 3RH29 can be installed on the contactors 3RT2 without tools, regardless of size. The auxiliary switches 3RH19/3RH29 are available as front or side-mounted versions, 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 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 modular system.