The Siemens 3RA1210-1FA15-0AM2 is a reversing motor starter in the SIRIUS 3RA12 family, size S00, rated for 208 VAC control voltage and 3.5 A operational current. The S00 frame means it fits the compact DIN-rail footprint common in small control panels — about the width of a standard miniature circuit breaker — so it slots into tight enclosures without re-laying the backplane.
This is a reversing starter, meaning it contains two contactors mechanically interlocked to swap any two phases to the motor — forward and reverse in one package. That saves panel space versus wiring two separate contactors with an external interlock, and it eliminates the risk of a phase-to-phase short if both coils energize simultaneously. The 3.5 A rating at 208 VAC covers small three-phase motors — fractional-horsepower pumps, fans, or conveyors — where reversing is needed for direction control.
Size S00 defines the physical envelope: roughly 45 mm wide, matching the standard 22.5 mm per pole spacing. The 208 VAC coil is tapped directly from the control transformer, so no separate DC supply is needed. Verify the coil pickup and dropout voltage against your control circuit's tolerance — 208 VAC nominal coils typically hold in down to about 180 VAC.