The LP1D80008ED: The 125 A AC-1 figure is the load current you can switch continuously — that is the headroom for resistive heaters, lighting banks, or transformer primaries. Making and breaking capacity at 440 V is 1100 A, so it handles inrush from cold resistive elements without welding contacts. Mechanical durability is 10 Mcycles; the electrical durability of 0.8 Mcycles at rated load tells you the contact wear life under continuous use.
Mounts on either plate or rail (DIN). IP20 front face. Power circuit terminals accept 4 to 50 mm² (flexible without end sleeve), control circuit screw clamps take 1 to 4 mm². Torque for power terminals is 12 N·m — a standard screwdriver or hex driver. Depth is 196 mm (7.7 in), width 96 mm, height 127 mm, so it fits a standard 300 mm deep enclosure on a backplate. Operating altitude up to 3000 m; no derating needed at most altitudes.