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COMPONENT DESCRIPTIONS
The varistor
The varistor is a surge protection
device that is connected directly across the AC input. When a power
surge or voltage spike is sensed, the varistor's resistance rapidly
decreases, creating an instant shunt path for the over-voltage,
thereby saving the sensitive control panel components (hopefully).
Because the shunt path creates a short circuit, the varistor and the
line fuse are subject to be damaged or weakened in the process.
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