It is a plug-in unit (front-face mounting) that provides overload, short-circuit, phase failure, phase imbalance, and earth fault protection, with manual reset. The control circuit accepts 110...240 V AC or 110...220 V DC, drawing 280 mA peak during closing (with LUB32 or LUB38) and 25 mA sealed. Operating time is 35 ms opening and 50 ms closing when paired with a LUB38 control module.
Rated for AC-43 utilisation category (IEC 60947-6-2) — this is the motor-switching duty class for contactors and starters, meaning the unit is designed for switching motor loads with inrush. Motor power rating is 18.5 kW at 400...440 V AC, 18.5 kW at 500 V AC, and 22 kW at 690 V AC (50/60 Hz). The tripping threshold is 14.2 x Ir ±20 %, so the instantaneous magnetic trip clears short-circuits well above the thermal overload curve. Thermal overload class is Class 10, temperature-compensated from -25 to 70 °C per IEC 60947-6-2 and UL 508 — this is the standard for standard-duty motor starting; for heavy-duty or frequent starts, a Class 20 or 30 unit would be needed.
Mounts via plug-in front face into the TeSys Ultra base (e.g. LUB38). The unit is self-cooled and requires no additional heatsinking for the control electronics. Dimensions: 45 mm wide, 66 mm high, 60 mm deep. Suitable for DIN-rail or panel-mount enclosures when paired with the appropriate base.