Siemens SIRIUS 3RT1056-6SP36-3PA0 — Power Contactor, Size S6
The Siemens SIRIUS 3RT1056-6SP36-3PA0 is a Size S6 power contactor rated for motor switching in industrial control panels. Its coil accepts 200-277 V AC, and the main power circuit terminates via screw-type terminals on the magnet coil side, accepting stranded conductors from 25 to 120 mm². The contactor carries an auxiliary switch block integrated into the assembly.
Ratings and What They Mean for Fit
The AC-3 switching frequency is rated at 750 operations per hour maximum, which suits motor starting duty for conveyors, pumps, and compressors in a typical production line. AC-4 duty, which covers plugging and inching, is limited to 130 operations per hour — a real constraint if the application requires frequent reversing or jogging. The mechanical life is listed at 10,000,000 typical operations, so the contactor is built for long service in high-cycle applications. The arcing time of 10-15 ms is within the range for standard AC contactors; coordination with upstream short-circuit protection should account for this let-through energy. The auxiliary contact ratings at 24 V rated value are 10 A, dropping to 2 A at 48 V and 60 V — this governs what control loads the auxiliary block can switch directly without an interposing relay.
Mounting and Integration
Mounting is by screw fixing through a single 9 mm hole. The contactor can be installed on a vertical mounting surface, rotatable ±90°, and tiltable ±22.5° to front and back. Clearance requirements: 10 mm upwards, 10 mm downwards, 20 mm forwards, and 10 mm at the side. The overall dimensions are 172 mm height, 120 mm width, and 170 mm depth — verify panel depth clearance before committing the layout.
Environmental and Lifecycle
Operating temperature range is -25 to +60 °C; storage temperature extends from -55 to +80 °C. Lifecycle status is current production.