The Siemens 3RT2316-2AF00-1AA0 is a SIRIUS contactor in size S00 with a 110 VAC coil rated for both 50 Hz and 60 Hz. It carries a 9 A rated operational current at 400 V in AC-3 duty, which means it switches a 4 kW motor load at that voltage — the rating that governs real motor starts, not just resistive heating. The main circuit uses spring-loaded terminals.
The 45 mm width and 73 mm depth fit standard S00 footprint — three units side-by-side take 135 mm of rail with the required 6 mm side clearance. Mounting position is standing on a horizontal surface; forwards and upwards clearance of 10 mm each keeps the arc chamber vent unobstructed.
AC-3 motor switching at 400 V is 4 kW — that is the load it handles across the starting and running cycle. AC-4 at 400 V also rates 4 kW, so it manages plugging and inching without derating. The main circuit impulse withstand is 6 kV, which covers standard industrial distribution without extra surge suppression. Arcing time runs 10 to 15 ms; the AC coil pickup and dropout are 7 to 13 ms — fast enough for most sequence logic but not for high-speed synchronous transfer.