TeSys U Advanced Control Unit for Motor Protection and Control
The Schneider Electric LUCBX6BLTQ is an advanced control unit within the TeSys U range, designed to manage and protect 3-phase motors. It integrates protection against overload, short-circuit, phase failure, phase imbalance, and earth faults, with a manual reset function. The 24 V DC control circuit draws 130 mA peak during closing (with LUB12) and 60 mA sealed, making it compatible with standard 24 V DC control systems in industrial panels. Rated for 0.09 kW at 400...440 V AC (50/60 Hz), this unit is suited for small motor loads such as fans, pumps, or conveyors in light industrial applications. The plug-in front-face mounting allows quick installation or replacement on the TeSys U base without disturbing wiring — a practical advantage for panel builders and MRO teams minimizing downtime.
Standards Compliance and Protection Characteristics
The LUCBX6BLTQ 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). These standards certify its suitability for motor starter applications in North American and European installations. The thermal overload class is Class 10 (frequency 40...60 Hz, temperature compensation -25...70 °C) per IEC 60947-6-2 and UL 508, meaning it will trip within 10 seconds at 7.2× Ir — appropriate for standard motor starting duty. The tripping threshold is set at 14.2 × Ir ±20 %, providing short-circuit protection coordination with the upstream TeSys U power base. The unit also offers phase failure sensitivity and immunity to microbreaks up to 3 ms, ensuring nuisance tripping is minimized on supply disturbances common in industrial environments.
Environmental and Mounting Specifications
The control unit measures 45 mm wide, 66 mm high, and 60 mm deep, fitting the standard TeSys U modular footprint. The plug-in design (front face) allows the control unit to be swapped without removing the power base wiring — a time-saver during troubleshooting or upgrade cycles. Rated for operation up to 2000 m altitude, with vibration resistance of 2 gn (poles open) and 4 gn (poles closed) per IEC 60068-2-6, and shock resistance of 10 gn (poles open) and 15 gn (poles closed) per IEC 60068-2-27. The protective treatment is TH conforming to IEC 60068, indicating suitability for tropical/humid environments.