Integrator's Note — SIRIUS 3RT1035-1BF40
The Siemens 3RT1035-1BF40 is a SIRIUS power contactor in the S2 frame size, with a 110 V AC coil and screw-type terminals for the main current circuit. It is rated for AC-3 motor duty at 22 kW on a 500 V supply and 11.4 kW at 690 V, with an AC-4 reversing/inching rating of 35 A at 400 V. The coil pulls in at 110 V rated value; auxiliary contact capacity is 10 A at 24 V DC, derating to 1 A at 110 V DC and 0.3 A at 220 V DC. Mechanical life is rated at 10,000,000 cycles typical. Mounting is via screw and snap-on onto 35 mm DIN rail per EN 50022, with side-by-side mounting permitted — no derating gap required between units for standard panel layouts. Pollution degree 3 (conductive pollution) means it is suited for industrial control panels where some condensation or light contamination is expected. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C. The front face carries an IP20 finger-safe rating; the terminal area is IP00, so the installer must provide touch protection via the enclosure or shrouds.
Sourcing & Lifecycle — Current Production
RoHS compliance is confirmed with a substance prohibition date of 05/01/2012, covering the EU RoHS directive. No UL or CSA listing number is explicitly carried in the spec record, so verify site-specific approval requirements with the local Siemens office or your panel certifier.
Wiring & Termination
Main circuit screw terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded conductors: 2x (0.75 to 25 mm²). Solid or stranded: 2x (0.75 to 16 mm²). Switching rates: AC-1 (resistive) max 1,200 cycles/hour, AC-2 (slip-ring motor) max 600 cycles/hour, AC-3 (squirrel-cage motor) max 1,000 cycles/hour, AC-4 (plugging/inching) max 300 cycles/hour. The DC operating time (coil drop-out) is 20 to 25 ms; arcing time is 10 to 15 ms.
Dimensions & Panel Fit
The contactor measures 55 mm wide, 112 mm high, and 130 mm deep. The S2 frame size is the standard footprint for this current class; it occupies one 55 mm wide DIN-rail module position. Allow clearance for the 130 mm depth behind the panel door, plus wiring space for the screw terminals.