It draws between 0.8 and 1.1 A at 50 Hz, which determines the control-circuit transformer sizing and the contactor's pick-up and hold characteristics. This is the replacement coil for SIRIUS contactors in the S0 and S2 frame sizes that use a separate coil assembly — not a complete contactor, but the electromagnetic actuator that pulls the main contacts in.
The coil snaps onto the contactor's magnet system. The 220 V AC rating at both 50 and 60 Hz simplifies stocking for panels that ship to mixed-frequency sites — one coil covers both. Verify the contactor frame size (S0 or S2) before ordering; the 3RT5945-5AN21 is the coil assembly only, not the full contactor.