Usually, a straight-plug fuse consists of two cables, which are connected by a fuse and a fuse holder or fuse box. One cable is connected to the positive power supply, and the other cable is connected to the device or device to which you want to power it. Separating the two cables with a fuse helps to protect the supplied circuit. A fuse holder or fuse box protects the fuse and is usually waterproof. Like other types of fuses, the main purpose of direct-connected fuses is to protect the circuits of electrical or electronic equipment. If the electrical equipment is suddenly charged by current, the filament in the fuse will melt and disconnect the circuit. Plug-in fuses look slightly different from other types of fuses, but work in the same way. One of the most common uses of inline fuses is cars. The starting motor usually consumes the maximum current of any component in the vehicle. Inline fuses are usually used to protect alternators and are designed to disconnect the circuit when the circuit is overloaded.https://www.renogy.com/solar-c....onnector-waterproof-