Where this motor sits on the SIMOTICS line
The 1FK71055AC711KB8 is a Siemens 3-phase synchronous servo in the high-inertia SIMOTICS S class, rated 48 Nm continuous torque and 7.75 kW mechanical output at a 2000 rpm nominal speed — a shaft rating that puts it squarely in the mid-frame machine-tool and packaging-axis range rather than light-feed axis duty.
What the 48 Nm / 7.75 kW figure decides on the BOM
48 Nm at 2000 rpm gives the 7.75 kW shaft figure on the nameplate, so any drive pairing has to deliver that torque continuously across the speed envelope without tripping the SINAMICS torque-limit model — undersizing the S120 module here shows up as I2T shutdowns on the slow-axis moves, not as an alarm during commissioning.
Sourcing posture for an eol_hot servo
For an eol_hot servo like this one, the spread between original-pack and surplus-channel pricing is the part of the business that matters — clean traceable stock from a known industrial source is what keeps a margin on the line and avoids the encoder-data-sheet mismatch that bites when a motor arrives with a DOA resolver. Quoted to order against the RFQ: pricing and availability for the 1FK71055AC711KB8 are confirmed at quote time from independent industrial channels, with lead time and lot condition returned per request rather than carried as a posted number.