What this reversing starter is
The Siemens 3RA1210-0GC15-0AP0 is a SIRIUS reversing starter — a non-fused load feeder in size S00. It combines a reversing contactor pair with bimetal motor protection, rated for 0.18 kW at 400 V. The design includes the supplied contactor (3RT10 15-1AP02), link module (3RA19 11-1AA00), circuit-breaker (3RV10 11-0GA10), and RS assembly kit (3RA19 13-1C).
The 0.18 kW rating at 400 V defines the maximum three-phase motor it can switch — match this to your motor nameplate, not the contactor's thermal current. The insulation voltage is rated 690 V, giving headroom for 400 V systems. Bimetal protection means the overload relay uses a thermal bimetal strip, which tracks motor heating closely and resets automatically after cooldown. Size S00 is the smallest SIRIUS frame, so this unit fits compact enclosures and tight DIN-rail layouts. The 90 mm width and 128 mm depth let you plan gland-plate space. Mounting position is horizontal only, and it snaps onto 40 mm busbar systems — no screws needed for the busbar connection.
Where this class of part is used
Reversing starters control the direction of three-phase motors in applications like conveyors, hoists, and valve actuators. The non-fused design means branch-circuit protection is provided upstream — typically a motor circuit breaker or fuses. The IP20 front protection suits installation inside a control cabinet, not exposed to washdown.