Semiconductor fuses are specially designed protective devices used to safeguard sensitive electronic components such as diodes, transistors, thyristors, IGBTs, and other power semiconductor devices. Unlike conventional fuses, semiconductor fuses operate extremely fast and are capable of interrupting fault currents before they reach levels that could damage delicate components. This fast-acting nature is essential because semiconductor devices have very low tolerance to overcurrent and short-circuit conditions.

Semiconductor fuses are commonly used in power electronic systems, including rectifiers, inverters, motor drives, uninterruptible power supplies (UPS), and renewable energy systems. They are designed with low melting energy (low I²t value), which ensures rapid response to sudden current surges.