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Electrical Specialty Fuses

FRN-R-5-6/10 Application Field and Working Principle

Specialty fuses are designed and manufactured to protect low voltage circuit equipment from short-circuits, overload, over-current, and thermal effects. Most specialty fuses are used in large equipment and in locations where the location or equipment type requires a specialized fuse design. FRN-R-5-6/10 fuses are one of the most widely used specialty fuses in the electrical industry.

Design

The FRN-R-5-6/10 fuse is a three-pole, three-wire fuse rated for 5 amps and 10kV. It has two poles for tripping, one for system reset, and one for locking. The three-pole means the fuse will trip if any one of the three lines is overloaded with current. The pole for system reset allows for a remote reset to be triggered if necessary when the fuse needs to be replaced. The locking pole prevents accidental tripping of the fuse if it is being actively monitored, for example if a safety system is in place to detect high amperage.

Application Field

The FRN-R-5-6/10 fuse is primarily used in industrial and utility grid applications. It is frequently found in medium voltage equipment such as switchgear and transformers, as well as in motor control and high power relay systems. It is also used in low voltage substation equipment like disconnect switches and circuit breakers. Applications usually involve extremely high switching current and large loads, so the FRN-R-5-6/10 can reliably limit the amount of current when these components are connected.

Working Principle

The FRN-R-5-6/10 fuse is designed to prevent short-circuits and overloads in high-power equipment. It is a three-pole fuse with two poles for tripping and one for system reset. When the current in the circuit reaches 5 amps, the two trips are initiated, and the trip current is reduced. This causes the fuse to stop conducting current and trip the circuit breaker. When reset, the fuse is reset and ready to operate again. A locking pole prevents accidental tripping of the fuse when actively monitored in a safety system.

Conclusion

The FRN-R-5-6/10 is a three-pole, three-wire specialty fuse used in medium voltage and high-power applications. It is capable of limiting current and preventing short-circuits and overloads. It is commonly used in industrial and utility grid applications, as well as in low voltage equipment. The three-pole design allows for the fuse to be triggered by any one of the three poles, and the locking pole prevents accidental tripping when actively monitored.

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