2839127

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TVS - Varistors, MOVs: 2839127 application field and working principle

A surge suppressor or “surge diverter” is a device that is designed to protect electrical equipment and wiring from damage due to surges in voltage resulting from lightning, accidental contact between high and low voltage lines or other sources. Surge suppression devices come in many different sizes and shapes, but one type of surge suppressor that is frequently used is the voltage-sensitive element (VSE). VSEs are typically made of a metal oxide varistor (MOV), also known as a varistor.

A MOV is a semiconductor device that is designed to allow current to flow in one direction while providing protection against over-voltage, while a varistor is a non-linear semiconductor that provides protection against over-voltage and over-current. 2839127 is a specific type of MOV, also known as a Zenor diode.

MOVs are used in many applications, including over-voltage protection, line conditioning, and current limiting. In these applications, the MOVs act as a voltage regulator, reducing or limiting excessive voltage or current, thus protecting the device from damage due to over-voltage or over-current. In addition, MOVs can be used to provide ESD protection for sensitive electronic components.

As its name suggests, a 2839127 has a forward voltage drop of 28V and a breakdown voltage of 39V. This makes it ideal for many applications, including over-voltage protection for AC power lines, low-voltage power supplies, and high-efficiency DC-DC converters. Moreover, 2839127s are also suitable for line conditioning and current limiting, as their forward voltage drop allows the device to act as a constant voltage source.

The operating principle of a 2839127 is relatively simple. When the applied voltage is below the breakdown voltage of 2839127, its resistance is low and it conducts current. When the applied voltage is higher than the breakdown voltage, the resistance of the MOV is increased, creating a “clamping” action that limits the voltage applied to the MOV. This clamping action is what provides over-voltage protection.

In addition to over-voltage protection, 2839127s are also popular for current limiting applications. When the current through the MOV exceeds a certain level, the resistance of the MOV increases, limiting the amount of current that can be passed through. This can prevent components from being damaged by excessive current.

MOVs, including the 2839127, are used in many applications that require over-voltage and over-current protection. Their operating principles are relatively simple, and they are very sturdy, making them ideal for use in a wide range of applications. They can withstand high voltages and currents, and provide protection from electrical surges that could otherwise damage sensitive components.

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