What it is and where it fits
The Siemens 3RT7035-1AB00 is a Size S2 SIRIUS contactor with three normally-open main poles, screw-type terminals on both main and auxiliary circuits, and a 24 V AC coil. It snaps onto a 35 mm DIN rail per DIN EN 50022 and can be screw-mounted as well. The front face carries an IP20 rating; the terminals themselves are IP00, meaning the wiring zone expects enclosure protection.
Key ratings and what they mean for fit
Rated insulation voltage is 690 V, and the maximum operating voltage in AC-3 duty is also 690 V — so this contactor handles 400 V and 480 V motor circuits without derating, and can switch 690 V loads within the AC-3 switching frequency of 800 operations per hour. The AC-3 maximum switching rate of 800 1/h means it is sized for moderate-duty motor starting; the AC-4 rate drops to 250 1/h, which governs inching or plugging applications where the contactor makes and breaks full motor current under stalled-rotor conditions. For DC-13 loads at 220 V, the rated operational current is 0.3 A — enough for a DC brake coil or small solenoid, not a main motor. The coil holds at 24 V AC nominal, drawing 0.42 A at both 50 Hz and 60 Hz. Closing power is 0.78 W DC equivalent; holding power drops to 0.42 W DC. That low holding draw means the control transformer can be sized lean — a 50 VA transformer will comfortably power several of these in a panel. Surge voltage resistance is rated at 6 kV, so the contactor meets basic impulse withstand for industrial control panels without external MOVs in most installations. Operating temperature range is -10 to +55 °C, storage from -25 to +70 °C. The shock resistance figures — 15g for 5 ms and 8g for 10 ms — are solid for a contactor mounted on a DIN rail in a panel near vibrating machinery, but not rated for direct mounting on a crusher or vibrating screen without additional damping. Pollution degree 3 means it is intended for industrial environments with conductive or dry non-conductive pollution; no conformal coating is assumed on the contactor itself.
Mounting and wiring constraints
For type of coordination 2 (short-circuit protection allowing contactor damage), the required gL/gG fuse is 80 A NH 3NA. For type 1 coordination (no damage to the contactor), the fuse rating is 125 A NH 3NA. These fuse sizes tell you the upstream protection needed for a 3-pole motor circuit; the contactor itself is not the short-circuit protective device.
Lifecycle and sourcing reality
For a buyer sourcing this exact order code, the supply posture is straightforward: quoted to order against an RFQ. The contactor is a standard catalog item, not a special or configured variant, so lead times are typical for the SIRIUS 3RT7 series.