The Siemens SIRIUS 3RT2025-1AF04 is a Size S0 power contactor with screw-type terminals on the magnet coil and main contacts. It carries a 14 A rated operational current at 480 V in AC-3 duty — that's the motor-switching current, not the resistive load rating, so size it for the motor FLA, not the contactor's AC-1 maximum. Mounting is straightforward: screw and snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width and 85 mm height fit the standard S0 footprint. Depth is 141 mm, which matters when you're laying out gland-plate clearance in a shallow enclosure. Operating temperature 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 — useful when the panel layout forces an unconventional orientation.
Wiring and Clearances
Main contact terminals accept solid or stranded wire from 1 to 10 mm². For dual-wire terminations, the range is 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). That covers most panel-building scenarios up to about 8 AWG. Minimum clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. The arcing time is 10 ms, and the switching frequency at AC-3 duty is rated at 1,000 operations per hour maximum.