Abstract: A fault protection device includes a magnetic capacitor unit and an isolation switch. The magnetic capacitor unit is capable of storing electrical energy, and has a first end and a second end. The isolation switch is capable of being switched on to electrically connect the first end of the magnetic capacitor unit to the second end of the magnetic capacitor unit for forming a short-circuit path between the first and second ends of the magnetic capacitor unit when the magnetic capacitor unit breaks down.