VM105MK122R020P050

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TVS (Transient Voltage Suppressors) Varistors, MOVs (Metal Oxide Varistors) are utilised in circuit designs to protect against voltage surges caused by lightning or transient surges. It is important for engineers, technicians, and other users to fully understand the application field and working principle of these important devices. For example, consider the device VM105MK122R020P050.

The VM105MK122R020P050 is a general purpose, Bi-directional, X-Rated, Metal Oxide Varistor with a 20mm disc diameter. Its peak pulse voltage rating is 1.05KV and its resistor value is 1.22MΩs. The device has a maximum rating of 500mA and a standard capacitance range of 27 – 39pF.

The VM105MK122R020P050 is typically used in low-voltage applications where high energy transients are expected. Its 20mm disc is ideal for surface mounting and the device is available in a range of standard case sizes.

The working principle of the VM105MK122R020P050 can be explained in the following way. When voltage transients, caused by lightning, surges, or other disturbances, occur and exceed the peak voltage rating of 1.05KV then the MOV rapidly increases its resistance to reduce the circuit voltage to a safe level. This is achieved by a process known as \'avalanche breakdown\', which causes more electrons to be generated in the MOV as the voltage rises. This increase in electrons leads to an exponential growth in the resistance of the device, as the electrons flow more easily when the voltage is lower. Once the transient passes, the resistance decreases to its nominal level, at which point the device is restored to its original status.

The VM105MK122R020P050 is an ideal solution for protecting circuits from damaging voltage transients. It is suitable for both AC and DC applications and can be used in a wide range of industrial, automotive, computer, and consumer electronic applications. By understanding it\'s application field and working principle, engineers and users can make an informed decision when selecting the right MOV device for their design.

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