V47ZU20PX2855

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The V47ZU20PX2855 is a varistor, also known as a voltage-dependent resistor (VDR). Varistors are voltage-dependent, non-linear resistors used for suppressing or diverting transient voltage swings, and have a wide range of applications. Varistors are also used as transient voltage suppressors (TVS) in circuit protection components.

The V47ZU20PX2855 is a multi-layer, metal oxide, bi-directional varistor designed for use to protect electric measuring, communication and other equipment from over-voltage transients. It is usually used to suppress voltage spikes caused by lightning, inductive switching, and similar large over-voltages.

The V47ZU20PX2855 is designed with an optimized electro-mechanical construction. It consists of two semiconducting discs made from zinc oxide particles impregnated and held together with an epoxy resin. The discs are separated by a spacer element which helps to increase the clamping voltage, and, in the event of a fault condition, the device can act as a shunt path for current, limiting and suppressing the voltage.

The V47ZU20PX2855 is widely used for line protection in power transmission systems, AC or DC circuits, and telecom equipment. Its large capacitance per unit volume and excellent high frequency characteristics make it suitable for a range of power conditioning electronics, including remotely operated switching and other electrical protection equipment. In addition, this type of varistor can be used in communications grids, e.g. to protect cable networks from over-voltage transients.

The working principle and operating characteristics of the V47ZU20PX2855 are similar to those of other metal oxide varistors. The varistor becomes conductive when the applied voltage exceeds the varistor’s clamping voltage, which is a function of the device’s design parameters. At voltages below the clamping voltage, the device acts as an insulator, and at voltages above it, the device acts as a conductor. This sudden transition from an insulator state to a conductor state, known as the non-linear characteristic of the varistor, allows it to absorb the excessive energy of the transient voltage and mitigate it to safe levels.

In practice, the V47ZU20PX2855 is typically installed in series with the circuit, providing transient surge protection to the system. The varistor is then able to shunt any over-voltage or over-current transients, limiting and suppressing the voltage and thereby protecting the system from damage. Once the transient has passed, the varistor returns to its non-conductive state, restoring normal functioning of the system.

In summary, a V47ZU20PX2855 is an efficient and reliable transient voltage suppressor designed for line protection and voltage transient suppression. The varistor’s optimized electro-mechanical design, along with its ability to withstand high capacitance per unit volume, make it suitable for a wide range of applications in power conditioning electronics and telecom networks.

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