Panel fit and mounting
The 3RT2327-1BF40: S0 frame means 60 mm wide, 85 mm tall, 107 mm deep — a compact footprint that leaves room for auxiliary contact blocks on the side. Screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. Mounting position is flexible: +/-180° rotation on a vertical surface, and you can tilt it forward or backward by +/-22.5°. Clearance: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. That's tight enough for a crowded enclosure but gives you room to land the power wiring.
Wiring and terminals
Main contacts accept stranded wire from 1 to 10 mm². The coil and auxiliary terminals take solid or stranded 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²). Screw-type terminals throughout — no spring-cage here, so you'll need a screwdriver at the panel. The contactor comes with an auxiliary switch built in, which saves you a separate block if you just need one N.O. or N.C. feedback to the PLC.