The LC3F400U7 is a pre-wired TeSys F star delta starter from Schneider Electric. It's built for motor control in AC-3 duty — the category for squirrel-cage motors during starting, running, and plugging. Rated at 400 A operational current at ≤440 V AC, it handles motor loads up to 185 kW on 220/230 V, 315 kW on 380/400 V, 355 kW on 415 V, and 375 kW on 440 V, all at 50/60 Hz. This isn't a bare contactor — it's a pre-assembled star delta assembly with three contactors (star, line, delta), pre-wired for a reduced-voltage start. The contact composition is 3 x 3 NO power poles, with auxiliary contacts: 1 NC and 1 NO on the star contactor, 2 NC and 1 NO on the line contactor, and 1 NC and 2 NO on the delta contactor. That's enough auxiliaries for interlocking and status feedback without adding blocks.
Making capacity is 4000 A, so it handles the inrush when closing into a stalled motor. Rated insulation voltage is 1000 V per IEC 60947-4-1 and 1500 V per VDE 0110 group C, so it's comfortable in 690 V systems with margin. Control circuit is 240 V AC 50/60 Hz, with a hold range of 0.85 to 1.1 Uc and dropout between 0.35 and 0.55 Uc. Inrush power is 1075 VA at 20 °C — your control transformer needs to handle that peak. That's a rugged unit for frequent starting applications like conveyors or compressors. Heat dissipation is 14 W — negligible for panel thermal calculations.
This is a plate-mount assembly — no DIN rail. Dimensions are substantial: 28.5 inches wide, 10.9 inches deep, 7.09 inches tall. That's a big footprint; plan the backplate layout accordingly. Power connections are via bolted lugs or busbars (30 x 5 mm busbar cross-section recommended), with M10 bolts. Control wiring uses screw clamp terminals accepting 1 to 4 mm² flexible or solid wire. Keep it inside a panel.
Compliance is solid: the starter meets IEC 60947-4-1, IEC 60947-1, EN 60947-4-1, EN 60947-1, and JIS C8201-4-1. That covers most global panel standards. Associated fuse rating is 500 A gG or 400 A aM at ≤440 V — use that for your short-circuit protection coordination.