The Siemens 3RA2115-1ED15-1BB4 is a SIRIUS 3RA2 non-fused motor starter, size S00, configured as a direct starter — meaning the contactor and overload relay ship as a single, pre-assembled unit ready to snap onto a 60 mm busbar system. It comes supplied with a 3RT2015-1BB41 contactor, a 3RA1921-1DA00 link module, and an 8US1251-5DS10 busbar adapter — so the panel builder gets a matched set, not a bag of loose parts. The coil pulls 24 V DC (rated value), and the thermal bimetallic overload release is set to CLASS 10 trip curve, sized for motor protection on standard induction motors up to the S00 frame.
Motor power coverage across common line voltages
At 400 V AC-3 duty this starter is rated for 1 500 W (2 hp); at 460/480 V it handles 2 hp; at 575/600 V it reaches 3 hp — so a single BOM line covers 400 V to 600 V three-phase motors without a variant swap.
Panel fit and mounting constraints
Width is 45 mm, depth 155.1 mm, height 200 mm — fits a standard S00 footprint on a 60 mm busbar system; snaps on without tools. Mounting position must be vertical; clearance above the unit is 20 mm, below 10 mm, and 9 mm at the sides — no space needed forward or backward. Operating temperature range is -20 to +60 °C, storage -50 to +80 °C, transport -55 to +80 °C — fine for most panel environments, but watch the upper end near a hot drive or transformer.