0203003.URG

Fuses are a type of overcurrent protection device designed to protect power circuits, electrical equipment, and electrical installations. URG fuses are a type of fuse specifically designed to protect electrical circuits with high surge currents. The URG fuse is designed specifically to trip at high surge current levels, while remaining operational after a specified overload current. In this article, we will discuss the application field and working principle of URG fuses.

Application Field Of URG Fuses

URG fuses are primarily used in applications where high surge currents up to 15 kiloamps may occur. Such applications include motor starting, instantaneous relay closures, lightning strikes, and short circuits. URG fuses are commonly used in applications where short-circuit protection is needed, such as in heavy-motor load applications. URG fuses are also suitable for use in circuits requiring overload protection.

Working Principle Of URG Fuses

URG fuses are designed to effectively protect circuits from high surge currents, while maintaining reliable operation after a previous overload current. The URG fuse has a melting element, which is designed to open an electrical circuit when it is exposed to a surge current above the fuse\'s rated capacity. When the surge current passes through the melting element, the thin filament is heated and begins to melt. This causes the filament to expand, which causes the window of the URG fuse\'s cover to open, disconnecting the circuit.

Once the circuit is disconnected, the URG fuse will remain in an open circuit state until it is reset. The URG fuse will reset itself after the circuit has cooled and the filament has solidified after the surge current has dissipated. After the URG fuse has reset, it will remain in a closed circuit state and the circuit will be functional again.

Conclusion

URG fuses are an effective and reliable overcurrent and surge protection solution for electrical circuits. URG fuses are designed to open a circuit in the event of a surge current, while remaining operational after a specified overload current. The URG fuse is ideal for applications where high surge currents may occur, such as motor starting, instantaneous relay closures, lightning strikes, and short circuits.