Auxiliary switch, side-mounted, 2 NO, Left: 41/42, 51/52, Right: 21/22, 31/32, current circuit: 1 NO, 1 NO, spring terminal connection, for contactors 3RT2.1. Auxiliary switch SIRIUS 3RH29 for expanding auxiliary contacts in the control circuit. The side-mounted auxiliary switches 3RH29 can be installed on the 3RT contactors without tools, regardless of size. The auxiliary switches 3RH19/3RH29 are available in front or side-mounted versions, with up to four instantaneous switching and up to two early-make closing and opening 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 consistently available with screw terminals and spring terminal connections. Simple, efficient, always up to date - the SIRIUS system modular concept.