Siemens 3RT2047-1AL20 — SIRIUS Power Contactor, Size S3
It mounts on a 35 mm DIN rail (per DIN EN 60715) via screw and snap-on fastening, with a 70 mm width that fits standard enclosure layouts. Rated for AC-3 duty at up to 850 operating cycles per hour (and 850 cycles/h at AC-3e), this contactor handles frequent motor starting in conveyor, pump, and fan applications. The screw-type coil terminals accept solid conductors from 2.5 to 16 mm² or stranded from 6 to 70 mm², giving you flexibility with common panel wiring. Operating temperature range is -25 to +60 °C, with storage down to -55 °C. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — handy when you're fitting it into a tight corner of an existing cabinet.
Dimensions & Clearance
The contactor measures 70 mm wide × 140 mm high × 152 mm deep. For panel layout, allow 10 mm clearance upwards, 10 mm downwards, 20 mm forwards, and 10 mm at the sides — these are the minimum air gaps for heat dissipation and arc quenching.