The Siemens SIRIUS 3RT1017-1AB01-ZW97 is a size S00 power contactor rated for switching motor loads up to 5.5 kW at 500 V in AC-3 duty. The 45 mm width and 72 mm depth fit standard DIN-rail enclosures with 35 mm rail per DIN EN 50022, and the IP20 front protection means it's safe for finger contact in a closed panel.
The 5.5 kW rating at 500 V AC-3 is the motor-switching capability — that's the headline number for sizing. For high-stress applications like plugging or jogging, the AC-4 rating of 8.5 A at 400 V is the one to watch; it's lower than the AC-3 current because the contacts take more wear breaking stalled rotor current. Short-circuit coordination is specified: type 2 coordination requires a 20 A gL/gG fuse, type 1 allows a 35 A gL/gG fuse. Type 2 means the contactor remains usable after a fault — no contact welding — which matters for production lines where downtime for replacement is expensive.
The screw-type terminals for the main circuit accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) — or AWG equivalents 2x (20-16), 2x (18-14), and 1x 12. That's enough for the motor leads on a 5.5 kW drive at 500 V.