insulation breakdown finite lifespan experienced electricians electrical equipment correct gauge frayed wires require reprogramming compatible components handling contactorsthyristors obvious signs short circuit age overheating fail due common issues minimize downtime time prompt experience malfunctions commercial settings erratic switching switching devices insulation testing wiring issues faulty component effective repair apfc panels repair process panel fusebreaker tripping ensure accurate readings power factor controller prevent future problems configuration wiring repair leakage electrical testing apfc panels troubleshooting overload repair process switching capacitors correctly issue component replacement correctly controller malfunction genuine replacement parts technicians genuine parts ensuring proper discharge builtin diagnostic features check voltages currents malfunction preventing capacitors