It is a deliberate weak point in the circuit that melts and breaks the circuit when too much current flows through it. This prevents damage to the wiring and other components in the system.
Fusible links are usually made of a metal with a low melting point, such as zinc or lead, and are typically installed in series with the power supply. When too much current flows through the link, the metal melts and the circuit is broken.
In a car battery, the fusible link is typically located near the battery terminals. It is designed to protect the wiring system from damage if the battery is overloaded or if there is a short circuit.
