PV fuses are utilised to protect solar power gathering equipment against overcurrents, reserse currents and short circuits that can occur within alternative energy gathering PV string installations. Photovoltaic (PV) fuses vary in a number of different ways including fuse speed, voltage and amperage rating, breaking capacity and their physical size and shape. Photovoltaic fuses have the following superior properties: 1. Comprehensive protection: PV fuses can effectively break down to 1000Vdc. Especially suitable for thin film batteries and 4", 5", 6" crystalline silicon panels; 2. Environmental protection and recyclable: Photovoltaic fuses fully consider the operation of the photovoltaic panel system and the environmental impact; 3. 1000Vdc capacity: Photovoltaic fuses are suitable for typical photovoltaic panel systems, operating conditions can reach 1000Vdc, and the fusing response time is less than 1ms; 4. 10×38mm international standard specification: suitable for various current ranges, there are standard metal ferrules, bolts and multi-purpose circuit board mounting methods to choose from.

In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current. It is a sacrificial device; once a fuse has operated it is an open circuit, and must be replaced or rewired, depending on its type. Fuses have been used as essential safety devices from the early days of electrical engineering. Today there are thousands of different fuse designs which have specific current and voltage ratings, breaking capacity, and response times, depending on the application. The time and current operating characteristics of fuses are chosen to provide adequate protection without needless interruption. Wiring regulations usually define a maximum fuse current rating for particular circuits. Short circuits, overloading, mismatched loads, or device failure are the prime or some of the reasons for fuse operation. When a damaged live wire makes contact with a metal case that is connected to ground, a short circuit will form and the fuse will melt. A fuse is an automatic means of removing power from a faulty system; often abbreviated to ADS (Automatic Disconnection of Supply). Circuit breakers can be used as an alternative to fuses, but have significantly different characteristics. This is a cylindrical fuse. When the circuit fails or is abnormal, the current continues to rise, and the increased current may damage some important components in the circuit, or may burn the circuit or even cause a fire. If the fuse is correctly placed in the circuit, the fuse will cut off the current by itself when the current abnormally rises to a certain height and heat, thus protecting the safe operation of the circuit.

High speed fuse is a type of fuse, which is mainly used for short-circuit protection of semiconductor rectifier components or rectifier devices. Since the overload capacity of semiconductor components is very low, they can only withstand large overload currents in a very short period of time, so short-circuit protection is required to have the ability to quickly fuse. The structure of the high speed fuse is basically the same as that of the enclosed fuse with filler, but the melt material and shape are different. It is a variable-section melt with a V-shaped deep groove punched by a silver sheet. In addition to a metal wire with a certain shape, the fuse of the quick-acting fuse will also have a solder joint of a certain material on it, the purpose of which is to make the fuse disconnect quickly under overload conditions. The melt of the high speed fuse is made of pure silver. Due to the low resistivity, good ductility and good chemical stability of pure silver, the melt of the high speed fuse can be made into thin sheets and has a round hole and narrow neck structure. When a short-circuit fault occurs, the current density at the narrow neck is large, so the narrow neck is first fused and divided into many small sections by quartz sand. In this way, the arc formed by the melting of the melt is divided into many small sections by the quartz sand, the arc current is small, the distribution space is small, and it is easily absorbed by the arc extinguishing agent. And because the quartz sand is insulating, an insulator is formed immediately after the arc is extinguished to break the circuit.