Auxiliary switch on the front, 1 NC Current path 1 NC Connection from top for 3RH and 3RT screw terminal 71/72 auxiliary switch SIRIUS 3RH29 for the expansion of auxiliary contacts in the control circuit. The front-mounted 3RH29 auxiliary switches can be installed on 3RT2 contactors and 3RH2 contactor relays without the need for tools, regardless of size. The 3RH19/3RH29 auxiliary switches are available as versions for front or lateral mounting, with up to four instantaneous contacts or up to two leading NO and NC contacts. The auxiliary switches can be designed as positively driven contacts in 3RH contactor relays or also as mirror contacts in the case of 3RT power contactors. All of them are available with screw terminal and spring-type terminal. Simple, efficient and always up to date – SIRIUS modular system.