2JQ 300-R

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Fuses are electrical safety devices used to protect people, buildings, or equipment, from potential damage caused by an overloaded or short-circuited electric circuit. The 2JQ 300-R is a type of fuse that combines current and time limiting characteristics into one device. It is designed to protect problematic circuits, such as those which may have excessive inductive loads, from surges and large inrush currents. This article provides an overview of the applications and working principle of the 2JQ 300-R.

Applications

The 2JQ 300-R is intended for use in industrial and commercial applications that have inductive loads, such as voltage-controlled switchgear for medium voltage motors. It can provide superior protection from surges, short circuits, and other damaging events which could occur due to excessive inrush current. It is suitable for a variety of industrial and commercial processing and manufacturing businesses, including petroleum refineries, cement plants, chemical plants, and food and beverage processors. Additionally, it can be used in residential, commercial, and agricultural applications where high levels of current are likely to pass through circuits.

Working Principle

The 2JQ 300-R fuse is a dual-element current limiting fuse. It has a current limiting element, which limits the current flowing through the circuit, and a time-delay element, which allows current to flow through the circuit but limits the amount of time it can do so. Together, they provide superior protection from both short-term and long-term overloads and surges in the circuit. The current limiting element of the fuse operates by increasing the impedance of the circuit, limiting the rate of rise of current to a predetermined amount. This allows it to “sniff out” an overload before it can cause damage. The time delay element is designed to allow the current to remain at safe levels for a predetermined amount of time before automatically tripping and shutting down the circuit. This ensures that the circuit does not suffer from a sustained overload which could cause permanent damage.

In short, the 2JQ 300-R fuse combines current and time-limiting features into a single device. It is designed for industrial and commercial applications which may require high currents passing through circuits, such as switchgear for motors. It is capable of providing superior protection from both short and long-term overloads and surges, thus protecting people, equipment, and buildings from potential damage.

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