What this SIRIUS direct starter delivers
The Siemens 3RA2110-4AE18-1AP0 is a SIRIUS direct (on-line) starter in frame size S00 — a factory-assembled combination of a contactor and a circuit-breaker in one package, saving panel space and wiring time compared to building the pair from loose components. Rated 15.5 A at AC-3 at 400 V, it switches standard three-phase squirrel-cage motors with a Class 10 trip curve that clears overloads fast enough for most pump, fan, and conveyor starts without nuisance tripping. The main circuit uses spring-loaded terminals (cage-clamp style), so a panel wireman lands solid or ferruled stranded conductors without retorquing during commissioning.
Clearance requirements: 50 mm upward, 20 mm forward, 10 mm downward, 20 mm at the side, and 0 mm backward — meaning it can sit flush against a backpanel or enclosure wall on the rear face. The supplied link module (3RA2911-2AA00) bridges the contactor and circuit-breaker internally, so the installer runs motor leads to the breaker output and control wires to the contactor coil — no interconnecting power wiring needed.