SIRIUS S6 Power Contactor — 172 x 170 x 140 mm Envelope
The Siemens 3RT1055-6PF35 is a SIRIUS-branded power contactor in the S6 frame size, designed for heavy motor switching and resistive load applications in industrial control panels. It measures 172 mm high by 140 mm wide by 170 mm deep and mounts via screw fixing to a vertical surface, with ±90° rotatability and ±22.5° tilt front-to-back for panel layout flexibility. The coil is rated 96-127 VAC at 50/60 Hz with a 0.8 pick-up and 1.1 drop-out factor, using screw-type terminals for the magnet coil connection. Operating time is 80-90 ms for both AC and DC actuation, with an arcing time of 10-15 ms.
Duty-Cycle Ratings and Switching Frequency Ceilings
The contactor's maximum switching frequency varies by duty class: 800 operations per hour in AC-1 (resistive), 750/h in AC-3 and AC-3e (squirrel-cage motor starting), 300/h in AC-2 (slip-ring motor), and 130/h in AC-4 (plugging/inching). For a motor-starting application at AC-3, the 750/h ceiling means a minimum cycle time of about 4.8 seconds — relevant when sizing for high-speed indexing or frequent start-stop sequences. Mechanical endurance is rated at 10,000,000 operating cycles typical, which under AC-3 duty at 750 ops/h translates to over 13,000 hours of continuous cycling before mechanical wear becomes a factor. The auxiliary switch is included as standard, with contact ratings of 10 A at 24 V, 2 A at 48 V and 60 V, and 1 A at 110 V — sufficient for PLC input or relay coil pilot duty.
Termination, Clearances, and Environmental Limits
Main power circuit accepts stranded conductors from 25 to 120 mm² via a single 9 mm diameter hole per pole. Auxiliary circuits use screw terminals accepting solid or stranded wire: 2x 0.5-1.5 mm², 2x 0.75-2.5 mm², or max 2x 0.75-4 mm² per clamp. Minimum clearance distances to adjacent components: 10 mm upwards, 10 mm downwards, 10 mm at the side, and 20 mm forwards. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C. The power factor at rated load is 0.6 at both 50 and 60 Hz.
Sourcing and Lifecycle — Active Production
For BOM planning, the part is sourced to order against an RFQ. No stock-holding claim is made; each order is validated against the manufacturer's current lead time.