Key ratings and what they mean for fit
The 3RT1025-1AL24-3MA0: Rated for pollution degree 3, meaning it's suited for industrial environments where conductive pollution or dry non-conductive pollution that becomes conductive due to condensation may occur — typical for unsealed panels near machinery. The operating temperature range of -25 to +60 °C covers most plant-floor conditions without derating concerns. The S0 frame size with 45 mm width and 85 mm height keeps panel density reasonable; the 140 mm depth means it fits standard 200 mm deep enclosures with room for wiring behind the rail. Screw-type terminals on the main current circuit accept 2x (0.5...1.5 mm²) solid or 2x (0.75...2.5 mm²) stranded, with a maximum of 2x (0.75...4 mm²) — enough for most motor control circuits up to the contactor's rating.