The DRP completely protects the P.OT.DRP complete pump against lack of water in the well, without the aid of other equipment (probes, cables, sensors, control panels etc.). In case of dry running, the DRP automatically stops the pump. When the water level is restored in the well, the DRP restarts the pump after a programmed cycle time.
The P.OT.DRP complete pump is protected against overload. In case the pump is partially or totally blocked, the DRP, after some automatic re-start attempts, makes the pump enter the stand-by mode.
The DRP protects the P.OT.DRP complete pump against leaks in the piping system (also when the pressure tank is exhausted or its membrane is defective, or when there is a defective pressure switch) and too frequent starts and stops (for example if the tank is too small for the system). In such cases to avoid potential damages, the DRP, after some automatic re-start attempts, makes the pump enter the stand-by mode.
The DRP protects the P.OT.DRP complete pump against low voltage, that can damage the motor. Low voltage can occur, for example, if the section of the power cable is not adequate considering the motor power and the distance between the plug and the pump itself; or if a generator is faulty or undersized for the pump.
The P.OT.DRP complete pump is protected against phase-loss (caused by a brake of a fuse). The DRP protects the motor against damaging.