Siemens 3RA21104AA181BB4 is a SIRIUS direct-on-line motor starter (load feeder fuseless) in the S00 size, combining a contactor with motor protection for DIN-rail mounting. Designed for direct-on-line starting of 400 V AC motors, it handles 10–16 A and uses a 24 V DC coil. The unit provides 1 NO contact and a short-circuit current rating Iq = 150 kA with coordination type 1. Terminals are screw-type for DIN rail installation, reflecting its fuseless 3RA21 configuration to streamline wiring in motor protection and starting applications.
