The Siemens SIRIUS 3RT6926-5AP01 is a replacement magnet coil for S0-frame motor contactors rated up to 18.5 kW. It's the part that pulls the contactor in — when this fails, the contactor sits dead on the rail. The coil is wound for 230 V AC control voltage and accepts both 50 Hz and 60 Hz supplies, with a tolerance band that covers line fluctuations: 0.8 to 1.1 times nominal at 50 Hz, 0.85 to 1.1 at 60 Hz. Typical holding power is 9.8 VA, so it won't stress a small control transformer, but the inrush at pick-up will be higher — that's normal for an AC coil.
Integration note for the panel
Termination is screw-type, same as the S0 contactor base. The coil snaps onto the contactor's magnet system — no DIN-rail space consumed beyond what the contactor already takes. If you're swapping a failed coil in a live panel, kill the control voltage first; the AC coil doesn't have built-in suppression, so verify the free-wheel diode or RC snubber on the existing circuit is still intact before re-energizing.