The Schneider Electric LUCLX6ES is a TeSys Ultra magnetic control unit — a plug-in front-face device that combines motor control and short-circuit protection for 3-phase motors up to 0.09 kW at 400...440 V AC 50/60 Hz. It is designed specifically for protecting variable-speed drives or soft-start/soft-stop units, not just direct-on-line motors. The unit mounts via a plug-in (front face) fixing mode, so it snaps into a TeSys Ultra base or assembly without tools — a panel-builder detail that saves time on wiring and replacement.
Rated operational voltage [Ue] is 690 V AC, with a rated insulation voltage [Ui] of 690 V per IEC 60947-6-2 and 600 V per UL 60947-4-1 and CSA C22.2 No 60947-4-1. The utilisation categories are AC-43, AC-41, and AC-44, which cover motor starting, switching, and plugging/ inching duties respectively. For a 0.09 kW motor at 400 V, the unit's tripping threshold is set at 14.2 x Ir +/- 20 %, giving a magnetic trip that clears short-circuit faults fast — 35 ms opening with the companion LUB control units. The IP20 front panel and wired terminals (per IEC 60947-1) mean it's finger-safe in an enclosed panel; the IP40 front panel outside the connection zone adds a bit more splash protection on the face. Heat dissipation runs 2 W with LUB12, 3 W with LUB32 or LUB38 — negligible for panel thermal budgeting but worth noting if you're packing multiple units in a small enclosure.
Control circuit and environmental ruggedness
Control circuit voltage is 48 V AC or 48...72 V DC, with a dropout threshold of 29 V for AC and DC circuits — so a saggy 24 V control bus won't hold it in. Typical inrush during closing hits 280 mA at 48 V; sealed current drops to 35 mA (LUB12) or 45 mA (LUB32/38). The unit is rated for 2000 m operating altitude, TH protective treatment per IEC 60068, and vibration resistance of 2 gn (poles open) or 4 gn (poles closed) across 5...300 Hz. Shock resistance is 10 gn with poles open, 15 gn with poles closed. Immunity to microbreaks is 3 ms, and it withstands voltage dips down to 70 % for 500 ms per IEC 61000-4-11 — useful if your line feeds through a weak utility or generator transfer.
The unit carries approvals under EN 60947-6-2, IEC 60947-6-2, UL 60947-4-1 (with phase barrier), and CSA C22.2 No 60947-4-1 (with phase barrier). Safe separation of circuits is rated at 400 V SELV between control/auxiliary and main circuits per IEC 60947-1. Fire resistance is 960 °C for parts supporting live components and 650 °C for other parts per IEC 60695-2-12. The protective treatment is TH conforming to IEC 60068, suitable for tropical/humid environments.