Pumps in municipal and industrial environments often face dry-running or rotor blockages, causing sudden current surges. With its 5.5 to 8 A adjustment range, the thermal relay triggers a Class 10A trip to shut down the contactor before stator winding overheating causes permanent motor damage.

Conveyors frequently experience mechanical jams or heavy overloading, leading to high rotor currents. Operating at a 400V / 690V AC mains rating, the LRD12 actively monitors the operational current, breaking the control circuit of the LC1D contactor via its 1 NC auxiliary contact whenever a sustained overload is detected.

A single-phasing condition in three-phase fan motors causes rapid thermal build-up and winding burnouts. The LRD12's phase failure sensitivity triggers a trip when current unbalance exceeds standard thresholds (tripping current 130% of Ir on two phases, last phase at 0), isolating the fan and preventing costly replacement downtime.