The Siemens 3RT1056-6AP36-3PA0 is a SIRIUS-brand power contactor in the Size S6 frame, with a 220-240 V AC coil terminated through screw-type terminals and an integrated auxiliary switch. It is designed for motor switching in industrial control panels, rated for AC-3 duty cycles up to 750 operations per hour.
Sizing and fit
The Size S6 frame measures 172 mm high by 120 mm wide by 170 mm deep, with screw fixing through a single 9 mm hole. Mounting position allows vertical surface rotation ±90° and tilting ±22.5° front-to-back, giving panel-builders flexibility in tight enclosures. Power-circuit wiring accepts stranded conductors from 25 to 120 mm². The auxiliary and coil terminals handle solid or stranded wire: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or max 2x 0.75 to 4 mm². Clearance spaces: 10 mm upwards, 20 mm forwards, 10 mm downwards, 10 mm at the side.
Duty cycles and switching performance
Maximum switching frequency varies by duty: 800 operations/hour at AC-1 (resistive), 750/h at AC-3 (standard motor starting), 300/h at AC-2, and 130/h at AC-4 (plugging/inching). Arcing time is 10 to 15 ms; operate time spans 40 to 60 ms for both AC and DC coil supplies. Mechanical life of the contactor is rated at 10 million operations typical.
Environmental and auxiliary ratings
Operating temperature range is -25 to +60 °C; storage range extends from -55 to +80 °C. The auxiliary switch contacts are rated: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, and 1 A at 110 V.