The Schneider Electric TeSys U LUCB32FUTQ is an advanced control unit for motor control and protection, designed for 3-phase self-cooled motors. It provides protection against overload, short-circuit, earth fault, phase failure, and phase imbalance, with a manual reset. Rated motor power reaches 15 kW at 400...440 V AC, 15 kW at 500 V AC, and 18.5 kW at 690 V AC (50/60 Hz). The unit operates in utilisation categories AC-41, AC-44, and AC-43, which cover resistive and inductive motor loads typical in conveyor, pump, and fan applications. The control circuit voltage is 110...240 V AC or 110...220 V DC, drawing 280 mA maximum while closing and 25 mA sealed. Heat dissipation from the control circuit is 3 W. The unit is plug-in mounted on the front face of the TeSys U power base, making panel swaps straightforward without rewiring the power connections.
The tripping threshold for short-circuit protection is 14.2 x Ir ±20%, which coordinates with the upstream TeSys U power base and LUB32 or LUB38 control modules to clear faults within 35 ms opening time. Rated insulation voltage is 690 V (IEC 60947-6-2) and 600 V (UL/CSA 60947-4-1), with safe separation of 400 V SELV between control/auxiliary circuits and the main circuit. This allows the unit to be used in 400 V line-to-line systems without additional isolation barriers in the panel. The protective treatment TH conforming to IEC 60068 indicates tropicalisation for humid environments.
The manual reset button is accessible from the front. Vibration resistance is 2 gn (poles open) and 4 gn (poles closed) over 5...300 Hz; shock resistance is 10 gn (poles open) and 15 gn (poles closed).