V22ZU1

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Varistors, also known as voltage-dependent resistors (VDRs), are two-terminal components commonly used for storing and protecting against high voltage transients in electrical and electronics circuits. The V22ZU1 is a VDR type from Littelfuse which is rated for a voltage limit up to 5300V DC. The device is made of zinc oxide elements in a non-linear construction to generate a low-impedance, non-linear path to ground during an overvoltage transient.

The V22ZU1 can handle a maximum peak surge current of 15kA. Its dimensions are compact and the device has excellent clamping performance with a maximum capacitance of 0.6pF. It is designed for high reliability even at temperatures as low as -40°C. The V22ZU1 is capable of handling a wide range of surge currents, providing reliable performance and high surge absorption for a variety of applications.

The V22ZU1 application field is primarily in high power one- or two-phase and three-phase motor applications where large variations in load current can occur. During load transients, the VDR prevents excessive voltage from reaching the motor, providing protection from damage and ensuring smooth operation. It is also used in solar applications to protect inverters from abnormal conditions and spike voltages as well as in street lighting, industrial control, basic power circuit protection, and other power supply applications.

The working principle of the V22ZU1 depends on its non-linear construction and a characteristic voltage-dependent resistance. The resistance of the device increases rapidly when the voltage across it exceeds its rated clamping voltage. This causes an increase in the current going through the device while also diverting voltage from the protected circuit. When the voltage is reduced below the rated voltage, the resistance of the VDR returns to its normal value.

When an overvoltage transient occurs, the V22ZU1 is able to provide high level protection by diverting the surge current away from sensitive equipment and to ground. This protection is provided without the need for a fuse or thermal protection device which can cause long outage times. Additionally, the device can provide protection against reverse polarity spikes, making it well-suited for applications which require reliable surge protection.

The V22ZU1 is a reliable and cost-effective device for many applications where transient voltages are in danger of damaging sensitive electronics. Its compact design allows it to be easily integrated into existing circuits and its non-linear construction ensures that it is able to perform reliably and provide reliable protection against overvoltage transients.

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