TeSys Ultra advanced control unit LUCB18FU has manual reset and plug-in front-face mounting. Tripping threshold is 14.2 x Ir ±20% with thermal overload Class 10. The utilisation categories AC-43 and AC-44 (alongside AC-41) confirm this unit is rated for starting and switching of high-inrush motor loads—slip-ring motors, high-inertia drives, or frequent starts—not just resistive or lightly inductive circuits. The manual reset function means the operator must physically reset after a fault clears, a safety requirement for applications like conveyors, pumps, and compressors where automatic restart could be hazardous.
The unit measures 2.4 x 1.8 x 2.6 in (60 x 45 x 66 mm) and mounts by plugging onto the front face of the matching TeSys contactor base. This plug-in scheme reduces wiring time and makes replacement straightforward during a line-down event—no screw terminals to undo on the power side. The control circuit accepts 110...240 V AC or 110...220 V DC, with a sealed current draw of 25 mA rms, so transformer sizing for multi-unit panels is predictable. Compliance is documented against IEC 60947-6-2, UL 60947-4-1, and CSA C22.2 No 60947-4-1 (all with phase barrier), meaning it meets the three dominant standards for motor starter components in North America and Europe. IP20 on the front panel and wired terminals covers the typical enclosure requirement; IP40 on the front panel outside the connection zone adds a margin for dusty environments.