7010.9907.03

Fuses are an off-on electrical machine protection device that breaks an electrical circuit when overloaded current exceeds normal running current. This form of protection is used in both domestic and industrial applications and in high-voltage and low-voltage applications, too. In most cases, the fuse will reset itself after the overload condition has been solved in order to restore the normal running current: this feature is known as automatic courtesy reset.
The 7010.9907.03 fuse is a high-voltage disconnector fuse that offers circuit protection for high-voltage systems. This type of fuse works by using a blown fuse element to automatically break the circuit when the rated current is exceeded. The current range in which the fuse can perform its duty is 5-125A.

Application Field

The 7010.9907.03 fuse can be used in high voltage power systems for automatic protection against short-circuits and overcurrent conditions. It can be applied in a variety of different applications ranging from residential and industrial building services to high voltage transmission and distribution systems. It can also be used in outdoor lighting, solar photovoltaic, wind-turbine, and motor control circuits.

Working Principle

The 7010.9907.03 fuse works on the principle of thermal expansion of metallic strips. It is composed of two parallel strips of metal that are connected by two small pieces of low resistance material, forming a “U” shape. When the system voltage reaches its peak, the two ends of the “U” shape heat up and the thermal expansion causes the two strips to separate. This breaking of contact causes the electrical circuit to be broken, preventing any further electrical current from flowing through the system.

Safety Features

The 7010.9907.03 fuse also features several safety features. A shorting link is present between the two fuse ends which shunts current around the fuse and ensures no damage is caused to the system by over-current. Additionally, a special anti-resetting feature is built into the fuse which prevents it from being reset or switched back on after it has been tripped. The fuse is also fitted with a locking plate which prevents the fuse from being removed while still under voltage since this could potentially be hazardous.

Conclusion

The 7010.9907.03 fuse is a high-voltage disconnector fuse which offers circuit protection for high-voltage systems. Its range of applications stretches from residential and industrial building services to outdoor lighting, solar photovoltaic, wind-turbine, and motor control circuits. It works by using a blown fuse element to automatically break the circuit when the rated current is exceeded, and features several safety features such as a shorting link, anti-resetting feature, and a locking plate.