VLP220UF

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PTC Resettable Fuses are an important element in electronic circuit protection. Short circuit or overloads are automatically cut off by the fuse before causing damage to the system. The VLP220UF is specifically designed for protecting sensitive pro audio equipment from unbalanced line voltage. It provides protection from spikes up to 220 volts, and is rated for a maximum current of 2.9 amperes.

The VLP220UF fuse consists of two elements; an external PTC (Positive Temperature Coefficient) device, and an internal fuse mechanism. The PTC device is the heart of the fuse; it is an electronic resistive element that is not affected by electrical current, but instead responds to changes in temperature. The PTC features a non-linear characteristic; as the current through the element rises, the resistance also increases. In the VLP220UF, when an excessive current flows through the device, the temperature increases and the resistance quickly reaches a point where the current is drastically reduced; this is known as the ‘trip point’. One the current has fallen back to a safe level, the PTC device then cools down and the device is ‘reset’, ready to provide protection again.

The second element of the VLP220UF is an internal fuse mechanism. This element works in conjunction with the PTC device to provide increased protection from voltage spikes. When the internal fuse blows, the PTC device can still provide protection, until the fuse is replaced. It is important to note that this fuse should not be replaced more than twice.

Given its ability to provide regulated protection from electrical over-voltage, the VLP220UF is an ideal solution for pro audio applications that require power to function properly. When installed, it quickly responds to abnormal conditions, preventing damage to the system and ensuring continuous operation.

The VLP220UF is also suitable for reverse polarity and diode protection. The PTC device is designed to monitor the voltage and current in the reverse polarity circuit, and to disconnect it when too much current is detected. Additionally, it can protect the system from local and diode induced voltage transients.

Finally, the VLP220UF is also used in automotive applications. This device is used to prevent brake light failure due to an electronic dry or open circuit fault. It works by automatically resetting when the circuit is remade, thus preventing possible brake light failure.

In summary, the VLP220UF is a versatile and reliable fuse, specifically designed to protect sensitive pro audio equipment from unbalanced lines. The device consists of a PTC element and an internal fuse mechanism, which together provide increased protection and automatically reset when the overloaded or short circuit condition is resolved. The VLP220UF fuse is suitable for pro audio and automotive applications, as well as for reverse polarity and diode protection.

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