What it is and what it does
The Siemens SIRIUS 3RT2045-1AQ60 is a size S3 power contactor rated for switching motor loads in industrial control panels. It mounts on 35 mm DIN rail per DIN EN 60715, using either screws or a snap-on latch — no adapter plate needed for the standard rail profile. The contactor frame is 70 mm wide, 140 mm tall, and 152 mm deep, so it occupies a standard S3 footprint in the enclosure. The coil termination uses screw-type terminals; main power wiring accepts solid conductors from 2.5 to 16 mm² or stranded from 6 to 70 mm².
Key ratings and what they mean for your panel
The AC-3 switching frequency is rated at 1 000 operations per hour — that's about one cycle every 3.6 seconds, which covers most conveyor and pump duty cycles without derating. The AC-4 maximum is 300 operations per hour, reflecting the heavier electrical wear of plugging or inching loads. Mechanical endurance is listed at 10 000 000 operations typical, so the contactor outlasts most driven equipment in a standard 480 V motor branch. The auxiliary switch is built in, with contact ratings from 10 A at 24 V down to 0.3 A at 220 V — enough for PLC inputs or relay coils in the same panel. Ambient operating range is -25 to +60 °C, with storage from -55 to +80 °C. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so it fits odd-angle subpanels without derating.