What this coil does in the panel
The Siemens 3RT5944-5AM01 is a SIRIUS-series magnet coil that provides the electromagnetic actuation for a contactor when 220 V AC is applied at 50/60 Hz.
Control voltage and supply type
Rated 220 V AC — this is a line-voltage coil, not a low-voltage DC type, so it connects directly to a 220 V control transformer or panel supply without an intermediate rectifier. The AC rating at both 50 and 60 Hz means the same coil works across regional mains frequencies — no need to swap coils for a 60 Hz installation.