SPP-7K800

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Electrical components such as circuit breakers, fuses and selectors are essential for proper system operation. These components rely on the expertise of electrical engineers and surveyors in order to select the most appropriate pieces for the specific application. Fuses in particular are needed to prevent hazardous situations that may arise from sudden electrical load increases. The SPP-7K800 application field and working principle must be understood in order to ensure safe and reliable usage of the fuse.

SPP-7K800 Field Application

The SPP-7K800 is a high temperature, current limiter plug fuse that is designed for protection of industrial, commercial, and residential equipment. The fuse is suitable for the short-circuit protection of high voltage circuit breakers, rectifier units, switchgear, and controlgear. The maximum short-circuit rating of the fuse is 50,000 amperes and it has an operating temperature of -45°C to +155°C. The fuse is available in the ratings of 0.5A to 500A.

The design of the fuse incorporates an element that is composed of two 1/4” diameter copper bars that are embedded in a silicone compound. The two copper bars form an inverted U shape and are connected to two spring-loaded contact pins that are used to make the connection to the load or to the breaker.

SPP-7K800 Working Principle

The working principle of the SPP-7K800 is based on the principle of thermal Joule effect or Joule heating. Joule heating is the process through which an electric current passing through a conductor releases heat energy. The heat energy released by the conductor is proportional to the current square flowing through it, the resistance of the conductor and the time duration for which the current is passing through. Thus, the amount of heat energy released depends on the amount of current passing through the conductor, the resistance of the conductor, and the duration of time for which the current is passing through.

The SPP-7K800 has two copper bars embedded in a silicone compound, which act as a conductor. The two copper bars are configured in an inverted U shape, which increases the surface area of the conductor and thus increases the amount of heat energy that is released.

When the current going through the fuse exceeds a certain predetermined level, the heat energy released causes the silicone compound to expand. This expansion causes the two copper bars to move further apart, thus opening up the circuit and preventing further current from flowing through. The time for which the fuse will open up the circuit depends on the amount of heat energy absorbed by the silicone compound, which in turn depends on the current flowing through the conductor.

The fuse also has an internal filament which acts as a failsafe. If the current going through the circuit is too high, the filament melts, thus ensuring that the circuit does not stay open for too long and thus preventing possible damages.

Conclusion

The SPP-7K800 is a high temperature, current limiter plug fuse suitable for the protection of high voltage circuit breakers, rectifier units, switchgear, and controlgear. The SPP-7K800 works on the principle of Joule heating in order to limit the current flow. The fuse is composed of two copper bars embedded in a silicone compound, which expand when the current exceeds a certain predetermined level. The fuse also has an internal filament which acts as a failsafe in case the current is too high.

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