VG121022R440DP Circuit Protection

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Varistors, also known as voltage-dependent resistors (VDRs), are two-terminal devices which exhibit a non-linear, non-ohmic behaviour, with large changes in resistivity at specific voltage thresholds. As such, varistors are widely used in circuit protection applications to protect against electrical surges caused by lightning, transient voltage and over-voltages. The VG121022R440DP is a 12mm radial leaded varistor designed for transient overvoltage protection, and provides a high level of energy handling and current handling capabilities, making it suitable for high peak pulse current applications.

The VG121022R440DP is a unique device that combines metal-oxide varistors (MOVs) and ZnO thermo-variable resistors (TVR) into a single package, providing both short-circuit and transient over-voltage protection in one unit. The use of both MOVs and TVRs provides a high operational margin across multiple parameters, reducing size and cost while still providing the same level of over-voltage protection.

In order to understand the working principle of the VG121022R440DP, let’s take a look at the two main components that make up the device – the MOV and the TVR.

The MOV, or metal-oxide varistor, is made up of a core of zinc-oxide (ZnO) particles, combined with ceramic and other metal materials. When a varistor is subjected to a voltage above its specified clamping voltage, the MOV quickly becomes conductive and starts to absorb energy. This effectively acts to clamp and limit the voltage, thus providing over-voltage protection.

The TVR, or ZnO thermo-variable resistor, is made up of ZnO particles that are suspended in a ceramic matrix, and can provide short-circuit protection. When a short-circuit occurs, the ZnO particles become highly conductive, creating a very short low resistance path. This limits the amount of current that is allowed to flow and can help to prevent damage to the circuit.

The combination of the MOV and the TVR in the VG121022R440DP, in addition to the high level of energy handling and current handling capabilities, make it a suitable device for use in a variety of applications, including telecommunications, medical equipment, power supplies, automotive electronics, consumer electronics and industrial control.

The VG121022R440DP is particularly suitable for applications that require higher peak current handling capabilities as it is capable of handling up to 440A of peak current. The TVRs in the device ensure that the current is limited to a safe value in the event of a short circuit, while the MOVs provide high energy protection against lightning, spikes, over-voltages and transients. This makes the VG121022R440DP an ideal choice for any application that may be subject to lightning or other electrical over-voltage events.

In summary, the VG121022R440DP is a 12mm radial leaded varistor designed for transient overvoltage protection. Its combination of MOVs and TVRs provides both short-circuit and transient over-voltage protection in one unit, while the high level of energy handling and current handling capabilities make it a suitable choice for a variety of applications that may be subject to lightning or other electrical over-voltage events.

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