What this reversing starter is and why the rating matters
The Siemens 3RA2210-0GH15-2BB4 is a SIRIUS reversing starter — a compact, pre-assembled unit that combines two contactors and a thermal overload relay in one package, so you don't have to wire a reversing pair and a separate overload from scratch. The 0.63 A AC-3 rating at 400 V governs motor switching: that's the current it can break under full-load inductive conditions for a 3-phase motor. At 480 V and 600 V the rating holds at 0.63 A, so the motor current — not the line voltage — is the limiting factor.
Trip Class 10 and thermal overload — what they mean for motor protection
That's the standard for standard-duty induction motors — pumps, fans, compressors — where the rotor can survive a 10-second locked-rotor heat rise. The overload release is thermal bimetallic, so it tracks the motor's I²t heating curve naturally; no electronic settings to misconfigure. This matters for a reversing starter because the same overload element protects the motor in both directions — the contactors swap phases, but the overload sees the same motor current.
Busbar mounting and panel footprint
This unit is designed to snap directly onto 60 mm busbar systems — the standard spacing in Siemens and many European panel layouts. Mounting position is vertical. The dimensions are 155 mm deep, 90 mm wide, and 260 mm tall. That 90 mm width is the key panel-space number: it occupies a single 90 mm-wide slot on the busbar, leaving adjacent slots free for other feeders. Clearance requirements: 50 mm upwards, 32 mm forwards, 10 mm at the side, 10 mm downwards, and 0 mm backwards — meaning the back can sit flush against the mounting surface.
Supplied components and what you still need to add
The 3RA2210-0GH15-2BB4 ships with a 3RT2015-2BB42 contactor and a 3RA2911-2AA00 link module that mechanically and electrically interlock the two contactors for reversing duty. The supplied RS assembly kit is 3RA2913-1DB2. What you still need: a separate upstream short-circuit protection device (a circuit-breaker or fuse) sized to the motor full-load current — the overload relay protects against overload, not short-circuit. The size of the circuit-breaker should match S00, the same frame size as the contactor.