SIMOTICS S-1FK2 HD on the SINAMICS S120 line
The 1FK2104-4AF01-1SB0 sits inside the SIMOTICS S-1FK2 HD family paired with SINAMICS S120 drives, a high-dynamics servo line where the motor carries its own absolute encoder and feeds back across DRIVE-CLiQ rather than a conventional resolver cable. The flange shaft is D19x40 mm with a feather key, sealed to IP65 at the body and the connector face, so the unit goes into machine enclosures exposed to coolant mist or fine swarf — the integration angle is single-cable-less commissioning where the encoder, motor data, and brake switch all travel over one DRIVE-CLiQ link. Stall torque M0 is 1.27 Nm and the rated power is 0.4 kW at nN 3000 rpm on a 380-480 V bus, with an alternate duty of 0.2 kW at nN 1500 rpm on a 200-240 V bus — so the same frame is specified for both the European 400 V class and the North American 230 V class without a different winding. Position feedback is an absolute single-turn encoder with 22-bit resolution (AS22DQC), which resolves to roughly 19 arc-seconds per count — enough for precision indexing and registration moves without an external second encoder on the load.
Commercial identifiers for the paperwork
Product class is C — built to order, not reusable, not returnable for credit. The paperwork has to be clean on the inbound PO: a wrong encoder code or a wrong connector size on a class-C item cannot be reversed against a return, so the BOM line should be cross-checked against the Siemens configurator before the order is released. Compliance trail is RoHS-compliant since 01-07-06 and subject to REACH Art. 33 disclosure when a candidate-list substance is present above threshold; export control is AL:N / ECCN:N_CNDU, which generally clears without a licence for the destinations this motor class ships to, but the broker still files the ECCN line on the commercial invoice.
Lifecycle and supply posture
Lifecycle stage is recorded as current and the brand-level product status is active, so the motor is still in normal production rather than a last-time-buy position. The class-C nature of the part means the realistic path is quoted-to-order against the BOM line rather than off-the-shelf pick — lead time and a firm delivery window are confirmed at RFQ, not inferred from a generic catalogue entry.