The Siemens SIRIUS 3RT2035-1NB30-ZX95 is a Size S2 power contactor with a magnet coil rated for 20-33 V AC/DC, terminated via screw-type terminals. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, making it a direct panel fit for standard control cabinets. The coil draws 2 VA at both 50 Hz and 60 Hz, with an inrush peak of 3 A — a steady load for a 24 VDC control supply.
What the ratings mean for fit
The 20-33 V rated coil covers nominal 24 V systems with margin — dropout typically occurs below 18 V, so it holds through brownout conditions common on long cable runs. The auxiliary switch is included, saving a separate add-on block for status feedback. Mechanical life is rated at 10 million operations typical, with AC-3 switching at up to 1,000 operations per hour — suited for frequent motor starting on conveyors or pumps. Operating temperature range of -25 to +60 °C covers most indoor panel environments; storage from -55 to +80 °C handles shipping and warehouse extremes. The mounting position allows +/-180° rotation on a vertical surface and +/-22.5° tilt, giving flexibility in tight enclosures.
Panel integration
At 55 mm wide, 114 mm tall, and 130 mm deep, the Size S2 footprint fits standard 35 mm DIN rail. The screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire — no special ferrules required. Clearance spacing: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side for heat dissipation.