The Siemens SIRIUS 3RT1017-1AK64-3MA0 is a Size S00 power contactor rated for 5.5 kW motor switching at both 400 V and 690 V AC-3 duty.
The AC-3 rating of 5.5 kW at 400 V and 690 V means this contactor directly switches standard three-phase induction motors up to that power — a common 5.5 kW pump or conveyor motor on a 400 V line is a direct match. The AC-4 rating of 8.5 A at 400 V covers inching, plugging, or jogging duty where the contactor opens under full motor current; if your application includes frequent reversing or position stopping, that 8.5 A AC-4 figure is the one that governs contact life. The 24 V DC coil with a 10 A rated current is a standard PLC-level control signal. The coil holds reliably across the 0.85 to 1.1 x rated voltage range at 50 Hz and 0.8 to 1.1 at 60 Hz — so a 24 V supply that sags to 20.4 V still keeps the contactor sealed. The IP20 front and terminal protection means it belongs inside an enclosure, not in a washdown zone. For short-circuit coordination, the manufacturer specifies a Type 1 coordination with a 35 A gL/gG fuse and Type 2 with a 20 A gL/gG fuse. Type 2 coordination (20 A fuse) limits contactor damage to the point that it remains functional after a fault — important for high-uptime lines where you want to clear a short and restart without replacing the contactor.
The 45 mm width and 57.5 mm height fit the S00 footprint — side-by-side mounting is permitted with a 6 mm spacing to adjacent devices for heat dissipation. The screw terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²) stranded or solid conductors, with AWG equivalents of 2x (20-16), 2x (18-14), and 1x 12.