Auxiliary switch, front, 4 NC, 51/52, 61/62, 71/72, 81/82, current path: 1 NC, 1 NC, 1 NC, 1 NC, spring-loaded terminal, physically coded, can only be combined with 3RH2140 and 3RH2440 contactor relays (according to EN 50011) SIRIUS 3RH29 auxiliary switch for extending the auxiliary contacts in the control circuit. The 3RH29 front-mounted auxiliary switches can be mounted on the 3RT2 contactors and 3RH2 contactor relays without tools, regardless of the size. The 3RH19/3RH29 auxiliary switches are available as front-mounted or side-mounted versions, with up to four instantaneous switching or up to two leading switching NO and NC contacts. The auxiliary switches can be designed as positively guided contact elements in 3RH contactor relays or as mirror contacts in 3RT power contactors. They are available with screw connections and spring-loaded connections.Simple, efficient, always up-to-date - the SIRIUS modular system.