Siemens 3RT2317-2AB00-1AA0 SIRIUS Contactor — Integrator's Brief
The Siemens 3RT2317-2AB00-1AA0 is a Size S00 SIRIUS contactor rated for 5.5 kW motor load at 400 V in AC-3 duty — that's the real-world figure for switching a standard three-phase induction motor on a conveyor or pump. The 24 V AC coil is the one you'll find on most control transformer secondaries in European panels; it holds at 24 V nominal and drops out reliably below about 18 V. Spring-loaded terminals on both the main circuit and the coil mean no screwdriver torque check on a ladder — strip to 8 mm, push in, done.
The AC-3 rating of 5.5 kW at 400 V is the number that decides whether this contactor handles your motor — it covers most 7.5 HP (5.5 kW) four-pole machines in light industrial service. Rated current is 12 A at 400 V, so the main poles carry that continuously in a 40 °C ambient. Electrical life will be shorter and depends on the switching category and load current; for AC-3 at full rated current, expect roughly 1–2 million operations before the main contacts need attention. The 24 V AC coil draws 0.25 A at both 50 Hz and 60 Hz, so the control transformer sizing is straightforward — about 6 VA inrush, 6 VA sealed.
The Size S00 footprint is 45 mm wide, 70 mm tall, 73 mm deep — that's the compact frame that fits two contactors per standard 150 mm DIN rail section. Side-by-side mounting is permitted with zero spacing, so you can pack them tight in a panel. Standing orientation on a horizontal mounting surface is the specified position.