Check the electrical load and ensure that the sensors do not exceed the 10 Amp maximum. Check the tightness of electrical connections along the. In modern power systems, distribution boxes are the core equipment for power distribution and control, and their stable operation is crucial to ensuring the safety and reliability of power supply. The fuses are located behind a cover on the face of the PNDB. Do not touch live parts, turn off the corresponding power switch to avoid the risk of electric shock.