FNQ-12

Specialty Fuses

The FNQ-12 is a fuse made by Ferraz-Mersen that is typically used when a medium-voltage fuse is needed to interrupt short-circuits in either the AC or DC systems. The fuse is rated for up to 600VAC and 1000VDC.

The FNQ-12 offers an ideal solution for many applications, due to its symmetrical design, small size, light weight, and compact construction. This fuse\'s high-interruption capacity also ensures that protection is provided quickly and effectively in any short-circuit situation.

Application Field

The FNQ-12 is a reliable and cost-effective solution for many applications, and its applications range from photovoltaic power generation systems to residential single-phase lines. It is used in both single pole and three pole configurations, with a 6.3 kV voltage rating.

The FNQ-12 is also applicable in other power systems, such as industrial, electric power, and railway. Since it is installed in a variety of locations, the fuse is ideal for use in both general-purpose and hazardous locations.

Working Principle

The FNQ-12 operates by interrupting the current if it exceeds the maximum value in order to protect the circuit from damage. This is done through the fuse\'s current-limiting feature, which allows the fuse to quickly respond to faults and open the circuit before any damage occurs.

When the fuse is subjected to a current higher than its rated value, its fuse element melts and the top of the fuse pops off, disconnecting the faulty circuit while the bottom of the fuse remains closed. This is known as a “quick-make” operation, and allows for a fast response time when a fault occurs. Once the fault is eliminated, a resin bag and plug are placed in the fuse holes, and a new fuse can be inserted into the circuit.

Conclusion

The FNQ-12 is a reliable fuse that is designed to provide protection in short-circuit situations. It is used in many applications due to its compact size, lightweight design, and high-interruption capacity. It is also designed to provide a quick response to faults, as it operates by quickly opening the circuit when a fault occurs.