The 3RT1024-1AL20-ZX95: Mounts via screw or snap-on onto a 35 mm DIN rail per EN 50022. The 45 mm width is standard for the S0 size, so it'll fit existing panel layouts without surprises. Operating temperature range is -25 to +60 °C, which covers most industrial environments short of a foundry. IP20 on the front, IP00 at the terminals — that's typical for a panel-mounted contactor; the terminals need to be inside an enclosure.
Compared to the 3RT1023-1AL20, the 3RT1024 steps up in current handling. The 3RT1023 is a smaller frame; this one gives you the 10 A AC-12 rating and higher motor kW values (7.5 kW at 690 V versus the 1023's lower ratings). If your BOM called for the 1023 but your load calculations came in higher, this is the natural bump without changing rail footprint or terminal style.
Wire sizes: accepts 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded for control circuits, and up to 2x 10 mm² for the main power circuit. For short-circuit protection with Type 2 coordination, use a 25 A gL/gG fuse; for Type 1, a 63 A fuse. That's important for selectivity studies if you're coordinating upstream breakers.