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eFuse Market Trends, Share, Scope, and Research Insights by 2027 An eFuse or electronic fuse is an electronic device integrated with an FET i.e. field effect transistor, which is used for circuit protection by adjusting voltages and currents to a safe level in case of fault. Moreover, eFuses are replacing traditional, large-sized fuses that are employed for device protection. In case of overload, eFuses disconnect the load from the main power supply so as to avoid damage or malfunctioning.