The small cylindrical module near the end of a laptop charger cable is commonly referred to as an “inline fuse.” Its purpose is to provide protection for both the charger and the laptop in case of a power surge or electrical malfunction. The inline fuse acts as a safety switch that cuts off power to the charger and the laptop in the event of an over-current situation, preventing damage to the electrical components.
In other words, the inline fuse acts as a safeguard against electrical hazards, ensuring that the laptop and its components are not damaged by sudden spikes in electrical current. This can help to extend the life of the laptop and its components, as well as protect against potential fire hazards.
It’s worth noting that not all laptop charger cables come with an inline fuse, but for those that do, it’s an important safety feature that should not be overlooked.