VGAS181242U900DP Circuit Protection

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A varistor or MOV (metal oxide varistor) is a voltage-dependent non-linear resistor used to protect circuits from transient unsolicited electrical spikes. VGAS181242U900DP is a kind of varistor with radial leads, designed to protect sensitive electronic circuits from damage caused by transient voltage surges. It has wide application fields and its working principle is not complicated.

The VGAS181242U900DP is suitable for a range of applications including power supplies, computer peripheral cards, telecom and automotive such as cars, trucks and buses. It supports surge current of 4500 Amps and works as a transient voltage suppressor in these applications.

The VGAS181242U900DP utilizes the reverse biased P-N junction of silicon diode. In a normal circust, the varistor works like an opened switch. However, when an electrical spike occurs, the voltage of the spikes will exceed the breakdown voltage of the diode, making the N-end of the diode more negative than the P-end. Then the varistor operates like a closed switch to sense the AC and DC components of the current. The voltage varistor is then Actively connected to the circuit at both ends, and drag or absorb the voltage of spikes.

When it comes to the working principle of VGAS181242U900DP, it is based on Metal Oxide Varistor (MOV) principle. This varistor is based on a ceramic material made of zinc oxide (ZnO), which has a variable electrical resistance when exposed to changes in voltage. It works by controlling the inrush currents that occur during power up of an electrical device or system. Unlike a traditional silicon diode or transistor, the MOV will not limit the current flow, but instead will provide a path for the current to flow allowing it to be absorbed and dissipated. In doing so, the varistor will limit overvoltage conditions that could damage sensitive electronic components.

In short, the VGAS181242U900DP is a varistor used in applications such as power supplies, computer peripheral cards, telecom and automotive such as cars, trucks and buses. It works based on Metal Oxide Varistor (MOV) principle and utilizes the reverse biased P-N junction of silicon diode. When an electrical spike occurs, the varistor operates like a closed switch to sense the AC and DC components of the current, thereby limiting overvoltage conditions.

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