Star-delta function module, consisting of a base module and two coupling modules, time range 0.05-60 s, AC/DC 24-240 V, 50/60 Hz, integrated varistor for damping the contactor coils, for 3RT20 contactors. SIRIUS 3RA28 function module for star-delta start for attachment to 3RT2 contactors and 3RH2 contactor relays, e.g. for the targeted starting of motors, fans and ventilators. Simple and tool-free installation of star-delta starters including time function and electrical interlock without additional wiring. This avoids wiring errors and reduces testing costs. By attaching the devices to the front, you save space on the top-hat rail. Additional protective circuitry is not required. The automatic priority circuit reduces current peaks. The devices can be used worldwide thanks to international approvals (e.g. IEC, CCC, UL/CSA).The function modules are available for 3RT2 contactors and 3RH2 auxiliary switches in sizes S00 to S3. Available with a flexible wide voltage range AC/DC 24-240 V, selectable outputs 1 NO + 1 NC or 1 W and with screw or spring-loaded connection technology.Wiring kits and a sealable cover are available for the function modules.SIRIUS relays - a program for all situations.