The Siemens 3RT2028-1NP30 is a SIRIUS S0 power contactor with a 200-280 VAC coil, screw-type terminals, and an integrated auxiliary switch. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and its 45 mm width and 107 mm depth fit a standard S0 panel footprint.
Envelope and Mounting
The S0 frame measures 85 mm high by 45 mm wide by 107 mm deep. Mounting position allows +/-180° rotation on a vertical surface and +/-22.5° forward/backward tilt. Clearance: 10 mm upwards, downwards, and forwards; 6 mm at the sides.
Ratings and Duty
Rated for AC-1 at 1,000 operations/hour, AC-2 and AC-3 at 750 ops/h, AC-4 at 250 ops/h. Coil inrush peaks at 25 A. Arcing time is 10 ms. Mechanical life of the contactor typical is 10,000,000 cycles.