What this contactor is and where it lands
The Siemens SIRIUS 3RT1017-1BB42-ZW97 is a power contactor in frame size S00, built for switching motor loads and resistive loads in control panels. It snaps onto a 35 mm DIN rail per DIN EN 50022 or screws directly to a mounting plate. The 24 VDC coil pulls 3.3 W to close and holds at 3.3 W, so your control transformer sizing is straightforward — no inrush surprise on a DC coil. Rated at 5.5 kW at 400 V in AC-2 and AC-3 duty, it handles motor starts and stops on pumps, fans, and compressors within that power band. AC-4 at 400 V is rated 8.5 A for reversing or jogging applications where the contactor breaks full-load current on every cycle. The main circuit uses screw-type terminals that accept 2x (0.75 to 4 mm²) solid or stranded wire. Auxiliary contacts — 1 N/O + 1 N/C — are rated 10 A at 24 V, tapering to 0.3 A at 220 V DC. That 10 A at 24 V is your PLC output interface; the 0.3 A at 220 V is for pilot-duty control circuits.
Panel fit and integration
At 45 mm wide, 57.5 mm tall, and 72 mm deep, this S00 contactor eats minimal DIN rail space. Side-by-side mounting is allowed — no gap between units — but if you're packing them tight, remember the 6 mm side clearance to grounded metal for the arc chamber. Pollution degree 3 means it's rated for the conductive dust and humidity you find in an unsealed industrial panel. Front face carries an IP20 rating — safe for finger-probe access inside an enclosure. Operating temperature spans -25 to +60 °C, so it's fine in a hot motor control center or a chilly unheated pump house. Maximum altitude is 2 000 m without derating. Pick-up voltage is 0.85 x nominal (20.4 V for a 24 V coil); drop-out is 1.1 x nominal (26.4 V). That 85% pick-up means a sagging DC bus won't drop the contactor prematurely, but it also means you need a clean 24 V supply. The holding power being the same as closing — 3.3 W — tells you it's a DC-operated economized coil, not a simple solenoid.
Sourcing and lifecycle reality
For type 2 coordination (no weld-sticking after a short circuit), the required upstream fuse is gL/gG 20 A. For type 1 coordination (contactor may be damaged but clears the fault), it's gL/gG 35 A. Mechanical life is rated 30 million operations — that's a lot of cycles for a conveyor line or a pump start.