TeSys U standard control unit for motor protection
The Schneider LUCA18BLTQ is a standard control unit from the TeSys U range, designed for basic motor protection and control of 3-phase motors. It handles motor power up to 7.5 kW at 400...440 V AC, 9 kW at 500 V, and 15 kW at 690 V, covering a wide range of industrial motor loads like pumps, fans, and conveyors. The control circuit runs on 24 V DC, with a typical sealed current draw of 80 mA and a peak closing current of 220 mA. Drop-out occurs at 14.5 V DC, ensuring reliable operation within a 20...27 V DC window. This unit provides earth fault protection, overload and short-circuit protection, phase failure and phase imbalance detection, with manual reset. The tripping threshold is set at 14.2 x Ir ±20 %, and the thermal overload class is Class 10, temperature-compensated from -25 to 70 °C per IEC 60947-6-2 and UL 508.
Mounts via plug-in front face onto the TeSys U power base or starter controller. Dimensions are 45 mm wide, 66 mm high, and 60 mm deep — fits standard 45 mm DIN-rail spacing. IP20 on the front panel and wired terminals; IP40 on the front panel outside the connection zone per IEC 60947-1. Compatible with LUB32 and LUB38 control circuit modules. Opening time is 35 ms, closing time 70 ms with either module. Heat dissipation is 3 W for the control circuit.
Approvals include 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 400 V SELV between control/auxiliary and main circuits per IEC 60947-1.