What this contactor is and what it does
The Siemens SIRIUS 3RT1034-1AN60-1AA0 is a size S2 power contactor built for switching three-phase motor loads in industrial control panels. It carries a motor rating of 18.5 kW at 500 V under AC-3 duty, and 10 kW at 690 V — numbers that tell you it can handle a 25-hp-class motor on a 480 V line or a 15-hp motor on a 600 V line. The coil is wound for 200 V at 50 Hz, with a 200–220 V range at 60 Hz, so it drops into 208 V control circuits common in North American panels. Mechanical life is rated at 10 million operations, and the maximum switching frequency hits 1000 cycles per hour under AC-3, which is plenty for a conveyor or pump station that cycles a few times a minute.
What the ratings mean for fit
The AC-3 rating of 18.5 kW at 500 V is the one that governs motor starting — it's the current drawn during acceleration, not the locked-rotor inrush. The AC-4 rating of 250 operations per hour caps plugging or inching duty, so if you're doing frequent reversing or jogging, keep that in mind. The auxiliary contact ratings cover 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — enough for a PLC input or a pilot light. Coil operating range is 0.8 to 1.1 times rated voltage at 50 Hz, and 0.85 to 1.1 at 60 Hz, so a 200 V coil will pick up reliably down to about 160 V and drop out cleanly below that. Operating time is 7 to 20 ms, arcing time 10 to 15 ms, which is fast enough for most interlocking schemes.
Mounting and wiring
Mounts on a 35 mm DIN rail per EN 50022 — screw and snap-on, no tools needed. Side-by-side mounting is allowed, so you can gang multiple contactors without a gap. The main circuit uses screw-type terminals; the power wiring accepts stranded conductors up to 25 mm², and the control wiring takes solid or stranded from 0.5 to 4 mm². Front face is IP20, terminals are IP00, so keep the panel door closed. Pollution degree 3 means it's fine for industrial environments with conductive dust or occasional condensation.