The Siemens SIRIUS 3RA2215-0BD15-2AK6 is a non-fused reversing motor starter in Size S00, designed for direct-on-line reversing of three-phase motors up to 690 V AC-3 duty. The Trip Class 10 thermal bimetallic overload relay protects standard induction motors during start-up, while the magnetic short-circuit trip clears faults fast enough to avoid upstream breaker coordination issues.
The AC-3 rating at 690 V maximum means this starter switches squirrel-cage motors under full load — the standard duty for reversing applications on conveyors, pumps, and fans. The Trip Class 10 rating means it allows a 10-second overload before tripping, which covers most NEMA Design B and IEC standard motor starts without nuisance trips. The thermal bimetallic overload element tracks motor heating directly, so it responds to actual current, not just a simulated curve. The magnetic short-circuit trip provides instantaneous protection for the downstream motor and cable. Because it's a non-fused design, the upstream protective device (typically a circuit breaker or fuse) must be coordinated per the manufacturer's selectivity tables — the supplied circuit breaker 3RV2011-0BA15 is the intended match.
This reversing starter snaps onto standard 60 mm busbar systems, which is the common footprint for SIRIUS S00 feeders in motor control centers. The vertical mounting position is specified for proper heat dissipation from the bimetallic overload. The overall dimensions are 155.1 mm deep, 90 mm wide, and 200 mm high. The width is the critical dimension for DIN-rail or busbar spacing — at 90 mm, it occupies a standard 4-module width on a 60 mm busbar system. The depth of 155.1 mm means it will fit most standard 200 mm deep enclosures, but check the door clearance if a manual motor starter handle or operator is added. The supplied components include a contactor (3RT2015-1AK62), a link module (3RA1921-1DA00), a busbar adapter (8US1251-5DS10), and an RS assembly kit (3RA2913-1DB1). The main contact wiring accepts 0.5 to 4 mm² stranded or 2x (0.75 to 2.5 mm²), with AWG equivalents of 2x (20-16) for the contactor and 2x (18-14) or 2x 12 for the main circuit.