The Siemens 1FL2205-4AF11-0SB0 is a SIMOTICS S-1FL2 low-inertia servomotor sized for 400 V 3AC supply, with a rated power Pn=1.5 kW at a nominal speed Nn=3000 rpm and standstill torque M0=6 Nm with rated torque Mn=4.6 Nm on a 48 mm shaft-height frame. That torque headroom matters: with M0=6 Nm versus Mn=4.6 Nm, the motor absorbs roughly 30 percent overload above rated torque during acceleration peaks without saturating the drive current loop, which is what lets positioning axes stay inside their cycle-time budget when the load inertia spikes.
Mechanical build and feedback
An AS21bit absolute encoder feeds the SINAMICS S200 drive for commutation and position control, and the unit ships with an integrated holding brake for axis-locking when the drive is de-energised — confirmed by the published configuration description. The shaft is plain (no keyway), tolerance class N, and the housing carries an IP65 protection rating with an oil seal; the angular connector exits along the motor axis so the cable routing stays inside the cabinet envelope.
Compliance and ordering notes
Compliance with the RoHS substance restrictions is confirmed since 01-01-18, with REACH Article 33 information supplied via the manufacturer's candidate-list disclosure — the part is classed as Product class C, meaning it is built per order and cannot be returned against credit.
Sourcing posture
Because the part is built to order under Product class C, the realistic sourcing channel is RFQ-driven: a confirmed BOM quantity gets a formal quote with lead time and price-break ladder against the SINAMICS S200 drive it pairs with, rather than off-the-shelf stock. Group Code R220 and Product Group X0DK are the internal Siemens classification fields that should appear on the procurement paperwork so the motor is matched to the SINAMICS S200 commissioning profile, not a different drive family.