What it is and where it fits
The Siemens 3RT1017-1AP01-ZX95 is a SIRIUS-branded power contactor in the S00 frame size, designed for switching three-phase motor loads in control panels. It mounts via screw or snap-on onto 35 mm DIN rail per EN 50022, so it drops into a standard panel layout without extra bracketry. At 45 mm wide and 57.5 mm tall, it fits tightly in a crowded enclosure — useful when you're packing multiple contactors side by side (side-by-side mounting is supported).
What the ratings mean for your load
The headline motor rating is 5.5 kW at 500 V and also at 690 V — that's the AC-3 duty, which covers standard squirrel-cage motor starting. For tougher switching like slip-ring motors (AC-2), it still delivers 5.5 kW at 400 V, so it's not a one-trick pony. The AC-4 rating of 8.5 A at 400 V matters for reversing or inching duty where the contactor makes and breaks stalled-rotor current. If your application does frequent plugging or jogging, that's the number to watch — not the AC-3 figure. Auxiliary contact ratings cover the control side: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V. That's enough for direct PLC outputs or relay coils without an interposing relay in most cases.
Integration and wiring
Screw-type terminals on the main circuit accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²) — solid or stranded. That covers most motor leads up to 4 mm² without needing a terminal adapter. IP20 on the front and at the terminals means it's protected against finger contact but not washdown — standard for enclosed panel use. Pollution degree 3 suits industrial environments with conductive dust or occasional condensation. Operating temperature spans -25 to +60 °C, which covers most plant-floor conditions without derating concerns until you push past 60 °C.
Sourcing and lifecycle
For coordination, the manufacturer specifies a gL/gG fuse of 20 A for type 2 coordination (no damage) and 35 A for type 1 (damage allowed but safe). That's your selectivity starting point when designing the branch circuit.