Drop out fuse Cutout is a power protection device mainly used to prevent circuit overload or short circuit, in order to protect electrical equipment and personal safety. It is usually installed on branch lines and distribution transformers of 10kV distribution lines, with the function of isolating switches, which can reduce the range of power outages and create a safe working environment for maintenance sections and equipment. working principle The drop out fuse cutout consists of three parts: insulation support, dynamic and static contacts, and fuse tube. During normal operation, the fuse tube is tensioned by the fuse to form a closed position. When the system malfunctions, the fault current causes the fuse to quickly melt, forming an arc, which is extinguished by the arc extinguishing tube. After the fuse is blown, the lower static contact loses tension and flips down, causing the tightening mechanism to release the fuse tube, and the fuse tube falls to form a clear breaking position. Application scenarios Drop out fuses cutout are suitable for power systems with a frequency of 50HZ and a rated voltage of 35KV and below, and are usually installed on the high voltage side of distribution transformers or distribution main lines. It can be used in conjunction with isolation switches to replace automatic air switches; It can also be used in conjunction with load switches to replace expensive circuit breakers. In addition, drop out fuses also have the functions of short circuit protection, overload protection, and circuit isolation. Maintenance and replacement The safe use of drop out fuses cutout requires compliance with certain regulations. When choosing a suitable drop out fuse, the corresponding parameters such as current capacity, rated voltage, and melting capacity should be selected according to the needs. The installation location should be chosen to be close to the power supply, load, and other equipment in order to promptly cut off the faulty circuit. In addition, drop out fuses should be regularly inspected and kept clean, and regularly maintained and replaced
