Fuses & Relays are protective and control devices in electrical systems. Fuses are one-time-use safety components that interrupt a circuit by melting when current exceeds their specific rating, protecting against overloads and short circuits. Relays are electrically operated switches that use a low-current signal to control a separate, high-current circuit, commonly used in automotive and industrial controls. It is crucial to replace a blown fuse only with one of the identical type and amperage rating. Using an incorrect fuse or bypassing it can lead to wiring damage or fire.

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