The Siemens 3RA2125-4CD27-0AK6 is a SIRIUS non-fused motor starter, a direct starter design combining a contactor and a thermal bimetallic overload relay in one size S0 package. It is rated for AC-3 motor switching up to 690 V and delivers 11 kW at 400 V, 22 A at 480 V, and 15 hp at 460/480 V — enough for a moderate three-phase induction motor on a conveyor, pump, or fan.
This starter snaps directly onto a 60 mm busbar system, saving the DIN-rail adapter. Mounting position is vertical only. Clearance around the unit: 30 mm above, 10 mm in front, 10 mm below, 9 mm at the sides, and zero clearance behind. That zero-backward clearance means it can sit flush against a panel backplate.