What it is and what it does
The Siemens 3RT1466-6QP35 is a SIRIUS contactor in the Size S10 frame, rated for a 200... 277 V AC/DC coil — meaning it pulls in reliably across that whole range, not just at nominal. The auxiliary switch is built in, so you don't need a separate block for basic status feedback. Mounting is screw fixing; the front face carries IP20 with a cover, the rest is IP00 — plan for enclosure protection.
Key ratings and what they mean for fit
Coil voltage is 200... 277 V AC/DC — a wide-band coil that handles both 208 V and 240 V systems without a tap change. The auxiliary contact ratings span from 10 A at 24 V down to 0.3 A at 220 V and 3 A at 400 V; that covers most PLC and relay interface loads, but watch the 400 V rating if you're switching a small contactor coil in the same cabinet. Stranded wire capacity goes up to 240 mm² on the main power terminals — sized for heavy motor feeders.
Panel integration notes
Dimensions are 210 mm high, 165 mm wide, 202 mm deep — that's a Size S10 footprint. Mounting position allows vertical surface with +/-90° rotation and +/-22.5° tilt front-to-back, so you can orient it to fit the gland plate layout. Solid wire terminals accept 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²), max 2x (0.75... 4 mm²) for control wiring; main power lugs handle 70... 240 mm² stranded.