Electrical Exam Term
Fuse
An overcurrent protection device containing a fusible element that melts and opens the circuit when current exceeds its rating.
Detailed Explanation
Unlike circuit breakers, fuses are single-use devices that must be replaced after operating. Types include plug fuses (Edison base and Type S), cartridge fuses (ferrule and knife-blade), and high-rupture capacity (HRC) fuses. Fuses are classified as time-delay (for motor circuits, allowing brief startup surges) or fast-acting (for general circuits). NEC Article 240 covers fuse sizing, and they must not be installed in parallel.
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