What it is and where it fits
The Siemens SIRIUS 3RT2035-3NF30 is a size S2 power contactor with spring-type terminals, designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. It measures 55 mm wide by 130 mm deep by 114 mm tall, so it occupies a standard three-module footprint on the rail — no surprises for panel layout.
Key ratings and what they mean for fit
The coil is rated 83…155 V (likely AC/DC, though the evidence doesn't specify). Inrush current peaks at 1.5 A, and the holding power draw is 2 VA at both 50 and 60 Hz — that's a light load on the control transformer, so you can share a 24 VDC or 110 VAC supply with other devices without worrying about voltage sag on pickup. Operating temperature spans -25 to +60 °C, which covers most indoor panel environments. Storage range is -55 to +80 °C — the wider storage limit governs handling and shipping, not running conditions. Mechanical life is typical at 10 million operations. Electrical switching rates vary by duty: up to 1,200 ops/h for AC-1 resistive loads, 1,000 ops/h for AC-3 motor starting, and 300 ops/h for AC-4 plugging/inching. That AC-4 figure is the one to watch if the contactor sees frequent reversing or jogging — it's the limiting duty cycle.
Mounting and integration
Mounting position is flexible: ±180° rotation on a vertical surface, and can be tilted forward/backward by ±22.5° on a vertical surface. Clearances: 10 mm upwards, forwards, and downwards; 6 mm at the sides. That's tight enough for dense DIN-rail packing — just keep the 6 mm side gap for arc venting. Spring-type terminals accept 2x (0.5…2.5 mm²) solid or stranded wire. No screw torque to check — just strip and push. The auxiliary switch is built in (yes/no flag in the spec), so you don't need a separate add-on block for basic status feedback.