The Schneider Electric TeSys F LC3F185F7 is a pre-wired star delta starter, a complete assembly for reduced-voltage starting of three-phase induction motors. It integrates three contactors (line, star, delta) with the necessary interlocking and timing, factory-wired into a single unit rated for AC-3 motor switching duty. Rated motor power reaches 160 kW at 380/400 V AC and 185 kW at 440 V AC, making it suitable for large pump, fan, and compressor drives. The control circuit operates on 110 V AC 50/60 Hz, with a pickup range of 0.85 to 1.1 Uc and a dropout range of 0.35 to 0.55 Uc at 55 °C. Closing time is 20 to 35 ms; opening time is 7 to 15 ms.
The rated insulation voltage (Ui) is 1000 V per IEC 60947-4-1 and 1500 V per VDE 0110 Group C, meaning the internal clearances and creepage distances support installation on 690 V line supplies common in industrial plants. The rated breaking capacity is 1480 A and the rated making capacity is 1850 A, both per IEC 60947-4-1 — this defines the unit's ability to safely interrupt and close onto fault currents without welding or arc damage. Maximum operating rate is 2400 cycles per hour at 55 °C, so it can handle frequent starting sequences without thermal overload. Heat dissipation is 18 to 24 W, which must be accounted for in enclosure thermal calculations. The unit is plate-mounted (not DIN rail), so panel layout must provide a flat mounting surface and clearance for the 525 mm width and 235 mm depth. Associated fuse protection is specified at 315 A gG or 200 A aM up to 440 V, giving the coordination engineer a starting point for short-circuit protection. The IP2X front face with shrouds meets IEC 60529 for finger protection, but the unit is not sealed against moisture — it belongs in a clean, dry enclosure.
This class of pre-wired star delta starter is deployed in motor control centres (MCCs) and dedicated pump or compressor panels where reduced inrush current is required to avoid voltage dips on the plant network. The 160 kW rating at 400 V corresponds to a typical 300 A motor full-load current range, common in industrial water handling, HVAC, and material transport systems.
The pre-wired nature means it ships as a single assembly, reducing field wiring time and potential errors compared to building a star delta from discrete contactors and timers.