MOV-20D820KTR Circuit Protection

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TVS and varistors are two electrical components that serve the same purpose, namely to protect against transient voltages in electronic components. They are both designed to absorb energy and, when a certain threshold voltage is reached, dissipate it in the form of heat. In addition, they are often used in combination to create circuit protection & isolation. MOV-20D820KTR is one of such devices that has important application field yet working principle is somehow complex.

MOV-20D820KTR are voltage dependent resistors (VDR’s) that are used for surge protection applications. These devices limit transient voltages and thus protect the connected loads from overvoltage. They are most commonly deployed in the telecom and power utility industries. For instance, in telecom applications, the MOV-20D820KTR are used to protect electronic devices such as telephone lines and data centers from high-energy surges. In power utility applications, MOV-20D820KTR are used to safeguard circuit components, such as power lines and transformers, against lightning strikes.

The operating principle of MOV-20D820KTR is somewhat complex. They essentially operate by connecting two resistive “poles”. The first, which is connected to ground, is the trigger pole. The second, which is connected to the power line, is the clung pole. When a certain threshold voltage, known as the holdover voltage, is reached, the MOV-20D820KTR begins to conduct. This is known as a “trip.” When this happens, the MOV-20D820KTR will then dissipate the excess energy in the form of heat.

The MOV-20D820KTRs, however, are designed to do much more than simply absorb energy and dissipate it in the form of heat. These devices are actually designed to “correct” voltage transients. That is, when the threshold voltage is exceeded, these devices will alter the voltage of the power line to restore it to its normal operating level. This is done by absorbing the excess energy and then returning it back to the power line.

The MOV-20D820KTR is also designed to act as a fuse. That is, when the voltage exceeds its holdover voltage, the device is designed to “open” itself, thereby cutting off power to the connected device. This ensures that the device is not damaged or destroyed by the surge.

In conclusion, the MOV-20D820KTR is an important component for protecting electronic systems and devices from transient voltages and lightning strikes. This device operates by connecting two resistive “poles” and, when a certain threshold voltage is reached, dissipating the excess energy and restoring the voltage to a normal level. Additionally, they also act as fuses to protect connected devices from potential damage.

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