S6 frame, 132 kW at 500 V — the panel fit and the load it carries
The 3RT1056-6PP35-0SW0: This is a Siemens SIRIUS power contactor in the S6 frame size, rated for motor switching at 132 kW at 500 V in AC-3 duty — the standard category for squirrel-cage motor starting under load. The 172 mm height, 170 mm depth, and 140 mm width define the panel footprint; screw fixing through 9 mm diameter holes secures it to the backplate. The coil operates on 200–277 V AC at 50/60 Hz with a pick-up threshold of 0.8 × rated voltage and a drop-out ceiling of 1.1 × rated voltage. Coil connections are screw-type terminals, matching the main power circuit termination style.
Duty-cycle limits and switching capacity across the voltage range
Maximum operating rates vary by duty: 800 cycles/hour in AC-1 (resistive), 750 cycles/hour in AC-3 and AC-3e (motor starting), 300 cycles/hour in AC-2 (slip-ring motor), and 130 cycles/hour in AC-4 (plugging/inching). The mechanical endurance is 10 million cycles typical, so the limiting factor in a high-duty application is the electrical life under the specific load current. Switching capacity is specified across multiple voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 2 A at 60 V — these figures govern auxiliary contact or control-circuit switching, not the main motor path. The main poles carry the 132 kW motor rating at 500 V.
Clearance, conductor sizing, and environmental limits
Minimum clearances to adjacent metalwork: 10 mm upwards, downwards, and to the side; 20 mm forwards. These distances matter when packing multiple contactors in a row — the arc-chamber venting needs that gap to avoid flashover between units. The main circuit terminals accept solid or stranded conductors: two conductors per clamp in the ranges 0.5–1.5 mm², 0.75–2.5 mm², and up to 4 mm² for the larger pair. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Coil pick-up time is 80–90 ms for both AC and DC control supplies; arcing time is 10–15 ms. These timing figures matter for coordination with upstream short-circuit protection devices and for sequencing multiple contactors in a motor control centre.