What it is and what it does
The Siemens SIRIUS 3RT1456-6SF36 is a Size S6 contactor with a 96-127 V AC/DC coil and screw-type terminals. It's built for switching motor loads in industrial control panels, with a listed MTBF of 75 years — a solid reliability figure for a contactor in this class.
Key ratings and what they mean for fit
The 96-127 V AC/DC coil suits standard control transformers or DC control buses. The MTBF is 75 a — a statistical reliability figure for continuous-duty applications. The auxiliary switch is included (yes), which simplifies wiring for status feedback or interlock circuits without adding a separate block. The screw-type terminals accept 2x (0.5-1.5 mm²), 2x (0.75-2.5 mm²), and up to 2x (0.75-4 mm²) solid or stranded conductors — standard for panel wiring with ferrules.
Mounting and integration
Mounts via screw fixing with a 9 mm hole. The vertical mounting surface can be rotated ±90° or tilted ±22.5° front-to-back, giving flexibility in tight enclosures. Clearance: 10 mm upwards, 10 mm downwards, 20 mm forwards, 10 mm at the side — plan your panel layout accordingly. Size S6 frame (172 mm high, 120 mm wide, 170 mm deep) is a standard footprint for this current class, so it should drop into existing S6 cutouts without panel modifications.