The Siemens SIRIUS 3RT6926-5AB01 is a replacement magnet coil for Size S0 contactors rated up to 18.5 kW motor loads. It's the part you swap when the original coil opens or the winding shorts — not a contactor itself, but what makes the contactor pull in. This one is wound for 24 V AC at 50 Hz, with a tolerance band of 0.8 to 1.1 times rated voltage, meaning it'll hold in down to about 19.2 V and pick up reliably as long as the supply stays within that window. The coil draws 9.8 VA holding power — that's the steady-state load the control transformer sees once the contactor is sealed. Out here in the grease, if you're swapping a coil on a motor starter that's been cycling hard, that 9.8 VA figure tells you whether your existing 24 V control transformer has headroom for it alongside the other coils on the same bus.
Panel fit — Size S0 footprint
This coil mounts onto the Size S0 contactor frame — the same footprint used across the SIRIUS 3RT1 and 3RT2 series for 18.5 kW motor starters. If you're pulling a failed coil off a 3RT1026 or 3RT1017 contactor, this 3RT6926-5AB01 is the factory replacement winding.