What 1FK2104-4AF10-2SA0 is and where it slots in
The 1FK2104-4AF10-2SA0 is a SIMOTICS S-1FK2 HD servo motor from the 1FK2 high-dynamic family, designed to run on a SINAMICS S210 drive — the integrated motor-cable-drive architecture is what makes this frame size useful in compact, high-dynamic axis designs where cabinet space is at a premium. It is rated 0.4 kW at 3000 rpm on a 380–480 V supply, and 0.2 kW at 1500 rpm on 200–240 V, with a standstill torque M0 of 1.27 Nm — that dual-voltage rating is the lever that lets the same motor drop onto a 230 V machine tool line or a 400 V European assembly cell without re-spec.
Holding brake, encoder, and shaft detail
The motor ships with an integrated holding brake, so it holds the axis at standstill after the drive enable drops — a vertical axis without a back-up brake needs a second safety path, but the built-in brake covers the standard gravity-load stop. Feedback is an absolute single-turn 22-bit encoder (AS22DQC) over the OCC interface, paired with a cylindrical shaft D14 x 30 mm and a rotatable M17 plug — the rotatable connector is what lets you clock the cable exit to suit the cabinet layout rather than fighting the harness on install.
Mechanical and environmental envelope
Protection is IP64, which seals against dust and splashing water but is not rated for pressure washdown or submerged duty — for food-and-bev lines or outdoor cabinets, step up to an IP65+ variant rather than assume IP64 will hold up under hose-down.
Lifecycle and sourcing posture
The catalog ships one piece per package in a 452 x 250 x 267 mm carton, with group code R220 inside Siemens product group 9021 — useful when matching the motor against the SINAMICS S210 configurator or when filling out the commercial invoice line for customs.