The Siemens 3RA2215-1CA15-2BB4 is a SIRIUS non-fused reversing motor starter — a single-package unit that combines a reversing contactor pair, a thermal bimetallic overload relay, and a magnetic short-circuit trip in one S00 frame. It is designed for reversing applications where a motor must run forward and reverse without an external interlock — the mechanical and electrical interlocking is built in, so the two contactors cannot close simultaneously. The 24 V coil controls the switching; the thermal overload element provides Class 10 protection. Rated for AC-3 duty up to 690 V maximum, it handles motor switching at 400 V (750 W) and 500 V (1 100 W), with horsepower ratings at 200/208 V (0.5 hp), 460/480 V (1 hp), and 575/600 V (1.5 hp).
Mounting position is vertical; clearance requirements: 20 mm upward, 10 mm downward, 9 mm to the side, and no space needed forward or backward. Dimensions are 170 mm high, 90 mm wide, 97.1 mm deep — fits standard panel layouts for S00 starters.