The Siemens 3RA2110-0HA15-1AP0 is a SIRIUS direct (on-line) starter in size S00, combining a contactor and overload relay in one compact unit. It is rated 0.8 A at 400 V AC-3, so it switches small induction motors — fractional-horsepower pumps, fans, or conveyors — up to that current in a standard motor-starting duty cycle.
The S00 footprint — 45 mm wide, 97 mm deep, 167 mm tall — keeps the panel density high; plan for 50 mm clearance above and 20 mm forward for wiring and heat dissipation. Main circuit terminals are screw-type, sized for the S00 frame. The supplied contactor (3RT2015-1AP01) and link module (3RA1921-1DA00) arrive pre-assembled, so the panel builder wires the line and load directly without extra bridging.