Part identity and key ratings
The Siemens 3RT1056-6AF36 is a SIRIUS power contactor in frame size S6, with a magnet coil rated for 110... 127 V. It mounts via screw fixing with four 9 mm holes and accepts power cables from 25 to 120 mm² stranded. Auxiliary switch included; its terminals accept 2x (0.5... 1.5 mm²) solid or 2x (0.75... 2.5 mm²) stranded, max 2x (0.75... 4 mm²). Electrical endurance: maximum operating rate at AC-3 is 750 cycles per hour; at AC-1 (resistive loads) 800 cycles/h; at AC-4 (inching/jogging) 130 cycles/h. Mechanical life typical 10 million operations. Arcing time is 10... 15 ms, dropout delay typically 40... 60 ms for both AC and DC control.
What the ratings mean for your panel
The AC-3 rate of 750 ops/hour is what drives motor switching duty; you can sustain that pace without thermal derating as long as ambient stays within -25... +60 °C. Mounting position allows ±90° rotation and ±22.5° front/back tilt, so cabinet layout is flexible. Main power terminals accept 25–120 mm² stranded cable — common for S6 frame. Auxiliary terminals handle two conductors each up to 4 mm², enough for feedback loops and status lamps in the same terminations. Storage temperature range -55... +80 °C means the contactor can sit in an unheated warehouse between campaigns without issue.