What it is and what it handles
The Siemens 3RT5076-6AF36 is a SIRIUS power contactor in Size S12, built for switching motor loads and resistive loads in industrial control panels. It is rated for AC-3e duty up to 1,000 V, delivering 151 kW at 230 V (60 °C) and 362 kW at 400 V (60 °C) — figures that tell you the real-world motor-handling capacity at elevated ambient temperatures, not just a lab number at 40 °C. The contactor uses screw-type terminals for the main current circuit and is fixed by screw fixing, so expect a standard panel-mounting job with no special tooling. Side-by-side mounting is permitted, which matters when you are packing multiple contactors into a tight MCC bucket.
Where it lives: environment and mounting
Operating temperature spans -25 to +60 °C, with storage down to -55 °C and up to +80 °C. Pollution degree 3 means it is rated for the conductive dust and humidity you get in a cement plant or a quarry — no derating needed for the gritty air that eats lesser gear. Mounting position is flexible: vertical surface, rotatable ±90°, tiltable ±22.5° front-to-back. That gives you options when the panel layout is awkward. A varistor-based surge suppressor is built into the design, so you get basic coil transient suppression without adding an external module. That saves a wiring step and keeps the panel cleaner.