The 3RT5065-8AP38-0PR0 is a Siemens SIRIUS power contactor in the S10 frame, rated for AC-3 duty at 132 kW on a 400 V three-phase line (50-60 Hz). That 132 kW figure is the motor-switching rating — it tells you the contactor can make and break full-load current for an induction motor of that size under IEC 60947-4-1 utilization category AC-3, which covers starting and plugging/stopping. The coil is dual-rated 220-240 V UC (universal current), meaning it accepts both AC and DC control voltage in that range — useful when your control transformer or battery-backed DC supply lands in that window. The auxiliary contact block carries 2 NO + 2 NC instantaneous contacts, enough for basic interlocking and status feedback without an add-on module.
The closest functional sibling is the 3RT5064-6AP36-0TH0, also a SIRIUS power contactor but rated at 110 kW AC-3 at 400 V — 22 kW less than the 132 kW of this part. Both share the S10 frame and screw-terminal main connections, but the 3RT5064-6AP36-0TH0 carries a different coil voltage (96-127 V UC) and a lower maximum switching frequency (500 1/h at AC-3e versus the 700 1/h typical of the S10 class). If your BOM specifies 132 kW motor load at 400 V, the 3RT5064-6AP36-0TH0 undershoots; you need the 3RT5065-8AP38-0PR0 to hold the rating.
Deployment context — motor control centers and heavy loads
This contactor is sized for motor loads in the 132 kW class — think large pumps, compressors, conveyors, or crusher drives in mining and industrial plants. The S10 frame and screw terminals are built for the high current draw (330 A at 40 °C ambient) and the vibration that comes with heavy switching.