The Siemens 3RT1036-1BF44 is a SIRIUS S2 power contactor with screw-type terminals, designed for switching motor loads and resistive loads in industrial control panels. It mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022. Rated for 30 kW at 500 V in AC-3 duty (motor switching), 22 kW at 400 V in AC-2 duty (slip-ring motor starting), and 41 A at 400 V in AC-4 duty (plugging/inching). These are the ratings that govern real motor control fit — the AC-3 figure is the one to match against the motor nameplate. The contactor carries an operational current factor of 0.8 (initial) and 1.1 (full-scale), meaning it can handle sustained overloads up to 10% above nominal under the right conditions. Operating temperature range is -25 to +60 °C; storage range -55 to +80 °C.
Lifecycle & Sourcing
RoHS compliance date is 05/01/2012, confirming the part meets the EU Restriction of Hazardous Substances directive for the substance prohibitance listed.
Integration & Mounting
Dimensions: 112 mm height, 55 mm width, 179 mm depth. The S2 frame size fits standard 35 mm DIN rail per EN 50022. Side-by-side mounting is permitted, so multiple contactors can be ganged without spacing gaps. Terminal capacity: solid conductors accept 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), max. 2x (0.75...4 mm²); stranded accepts 2x (0.75...25 mm²). Minimum permissible conductor at 40 °C is 16 mm². The main current circuit uses screw-type terminals — no cage-clamp or spring terminals on this variant.
Electrical Performance
Coil rated at 110 V. Switching times: arcing time 10...15 ms, DC dropout 20...25 ms. Mechanical life typical 10,000,000 operations. Maximum switching frequency varies by duty: AC-1 (resistive) 1,000 cycles/h, AC-2 400 cycles/h, AC-3 800 cycles/h, AC-4 300 cycles/h. Auxiliary contact ratings at various DC voltages: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. For AC loads: 6 A at 230 V, 3 A at 400 V. Pollution degree 3 (industrial environment).