SPJ-7E700

The SPJ-7E700 is an electrical specialty fuse designed to protect components from short circuits in a wide variety of electronic and electrical products. It has been widely used in aircraft, medical, industrial, automotive, instrumentation, and many other applications requiring electrical safety. This fuse utilizes a unique design that combines efficiency and safety with maximum protection. In this article, we will discuss the application field and working principle of the SPJ-7E700.The SPJ-7E700 is a miniature size fuse, sometimes referred to as a “friction” fuse for its design that utilizes a narrow gap between two halves of the body that rubs against each other when the fuse is overloaded. This rubbing opens up the gap and stops the current from flowing through the fuse. The SPJ-7E700 is rated for 700 Amps but can be used in any application as long as it meets the arc rating requirements.The SPJ-7E700 is primarily used as a component protection device in many types of electronic and electrical equipment. It offers a degree of safety and protection that exceeds that of traditional components such as relays, circuit breakers, and fuses. It is also suitable for protection in a wide range of operating temperatures, ranging from -20°C to 85°C, ensuring its reliability in extreme conditions.The SPJ-7E700 incorporates a unique design that uses a dual-loop structure, which consists of two loops of ferrite material that are connected in series. This structure helps to significantly reduce the size of the fuse while also increasing its arc-discharge resistance. The arc-discharge is then distributed to two loops, which reduces the core temperature and voltage drop, ensuring a safe operation. The terminals of the fuse are formed in a “T” shape and are mounted onto a PC board for efficient connections and easy replacement.The SPJ-7E700 utilizes two distinct operating principles to ensure its reliability and performance. The first principle is its current-limiting action, which is achieved through the dual loop structure mentioned earlier. When the normal operating current of the fuse is exceeded, the arc-discharge is first distributed to the two ferrite loops, which absorbs the energy and limits the current. The second principle is the fault-clearing action, which occurs when the current exceeds the arc rating of the fuse. In this case, the arc-discharge opens up the gap between the two halves of the body, breaking the electrical path and thus eliminating the possibility of a short circuit or other harm to connected components.The SPJ-7E700 has been designed for use in equipment with different levels of sensitivity, and is able to protect the most vulnerable devices from overcurrents. It is suitable for a variety of applications, including aeronautical and automotive systems, HVAC systems, machinery operation, communications systems, medical equipment, and instrumentation. It is also suitable for applications that require high levels of safety or high levels of current-limiting, since the dual-loop structure can absorb significantly higher amounts of energy than traditional components.Overall, the SPJ-7E700 is an electrical specialty fuse that combines efficiency and safety with maximum protection. Its unique design utilizes two loops of ferrite material to reduce the size of the fuse while also increasing its arc-discharge resistance. The fuse is rated for 700 Amps and is suitable for protection in a wide range of operating temperatures, making it an ideal choice for many applications requiring electrical safety.