Inside the PDC are many fuses and relays which protect and control the many electrical circuits such as fuel pump and fuel injection systems. Fuses are used to safeguard electrical circuits and are designed to pop stopping the voltage flow in the event of a power overload or short circuit protecting the circuit wire from burning.
Though simple in operation, a switch does have its limitations. Like the wires and fuses in a system, it can handle only so much current before it fails.
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