The 3RA6120-2EP33 is a SIRIUS compact starter — a direct starter design that integrates the contactor and overload relay into one 45 mm wide housing, saving DIN rail space over a two-device build. The adjustable trip class (Class 10 or 20) lets you match the overload curve to the motor's starting profile — Class 10 for fast-ramping pumps and fans, Class 20 for high-inertia loads like conveyors or crushers that need a longer start time. Control voltage is 110-240 V AC/DC, so it works across both North American 120 V and European 230 V control circuits without a separate transformer tap.
The main circuit connects via plug-in terminals (no screw terminals on the power side), which speeds wiring and reduces the chance of a loose connection under thermal cycling. Solid wire capacity is 2x 0.25 to 1.5 mm² per clamp — fine for the control wiring but undersized for the main power; expect to use the plug-in terminals for the motor circuit and separate ring lugs for the line side.
Environmental and mechanical endurance
Operates from -20 to +60 °C ambient, with storage and transport range of -55 to +80 °C — suitable for unheated plant floors and shipping in non-climate-controlled trucks. Shock rated at 60 m/s² (6g) for 10 ms, three shocks per axis; vibration tested at 4-5.8 Hz with 15 mm displacement and 5.8-500 Hz at 20 m/s² for 10 cycles — it holds up on a conveyor drive or a compressor skid without nuisance trips.
No direct second-source cross-reference exists — the 6ES7517-3FP00-0AB0 is a Siemens PLC CPU, not a motor starter, and will not drop into this panel position without a complete rewire and control redesign.