JJS-2

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The JJS-2 is an important device used in electrical and specialty fuse applications. It is a two-pole, low-Voltage fuse that helps to prevent dangerous over-currents and overloads that can damage electrical equipment.

JJS-2 Construction and Function:

The JJS-2 has two ceramic bodies, each containing a pair of contact points that are connected to two separate circuits—one for each pole. Inside the body, each pair of contact points is connected to a cylinder of fuse wire. The fuse wire is silver-plated, high-temperature resistant copper wire, and is connected to copper end caps to provide a low-resistance contact point. This creates a low-resistance path between the two circuits. When an overload or short circuit occurs, the current flowing through the fuse wire causes it to heat up. This causes the surrounding air to expand, causing the two contact points to move apart, breaking the current flowing through the two circuits.

Working Principle:

In a healthy electrical system, the current flowing through the two circuit poles of the JJS-2 is equal, so the current flowing through each fuse is equal. However, if a short circuit or overload occurs, the current flowing through one pole is greater than the other, causing the fuse in that pole to heat up faster than the other. When the fuse in this pole reaches its melting point, the current flowing through that pole is interrupted, and the fuse rapidly opens, breaking the circuit.

Advantages of the JJS-2:

The JJS-2 offers several advantages over other specialty fuses. Firstly, it has a low-resistance contact point, which provides better protection against short circuits and overloads. Secondly, it has the capability to detect and open quickly in the event of an overload, preventing motor stall-out or other damaging effects of excessive current in the circuit. Finally, the use of a silver-plated, high-temperature resistant copper wire ensures the fuse will not become damaged in the event of an overload or short circuit.

Conclusion:

The JJS-2 fuse is an essential device for electrical and specialty fuse applications. Its small size and low-resistance contact point make it well-suited for use in low-voltage applications. Furthermore, its quick response to short circuits and overloads provides extra protection for sensitive electrical equipment. The use of a silver-plated, high-temperature resistant copper wire ensures the fuse will remain intact and operational in the event of an overload or short circuit.

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