The 3RT2015-2UB42: The coil is rated at 24 V DC, and the main contacts are rated for 10 A at that same 24 V DC level.
The Size S00 footprint is 45 mm wide, 70 mm tall, and 73 mm deep — that's a compact, single-module-wide slice on the rail, so it leaves room for other devices in a crowded panel. Wiring is through spring-type terminals on the magnet coil, accepting solid or stranded wire from 0.5 to 4 mm², or 2x (0.5 to 4 mm²) for daisy-chaining. No screwdriver needed for termination — just strip and push, which speeds up panel building. For clearance around the contactor: allow 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. That's tight enough for dense layouts, but the side clearance is the pinch point — don't crowd the sides if you're running multiple contactors in a row.
Environmental and operating limits
Operates from -25 to +60 °C and can be stored from -55 to +80 °C. The mounting position is flexible: +/-180° rotation on a vertical surface, and can be tilted forward/backward by +/- 22.5°. That's useful when you're fitting it into a non-ideal panel orientation.