1820-28-A3

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Gas Discharge Tube Arresters (GDT) are electrical devices used to protect critical circuits, equipment, and systems from over-voltage caused by lightning or other transients. The 1820-28-A3 GDT is commonly used to protect communication and instrumentation applications, including power transformers, amplifiers, and distributed antenna systems. GDTs function by releasing a predetermined voltage and current in a brief period of time when exposed to transient voltages and currents that exceed its rated voltage. This process is known as the “avalanche” effect and it helps maintain proper voltage on the protected device or line.

The 1820-28-A3 GDT is a Type 2 Class 2 device, meaning it is designed to protect two-wire sensitive loads from a maximum transient voltage of 1400 kV peak. The device is rated to 10.01 joules of energy and has a lightning-proof voltage of 25 kV peak.

The primary design of the 1820-28-A3 utilizes two main components: an internal gas-filled tube and an external resistor to control the voltage. The gas-filled tube is filled with a special mixture of Argon and Hydrogen, which helps ensure optimal performance. The gas-filled tube is then surrounded by a thermally activated resistor. This resistor helps ensure that the device is able to control the voltage efficiently and accurately, by increasing the resistance as the voltage rises. This action helps reduce the overall power demand on the protected equipment.

When a transient voltage occurs, the gas, or “dielectric” inside the tube ionizes, which helps create a conductive path to ground. This action results in a very quick discharge of energy, controlled by the resistor. Without the resistor the discharge might create a potentially damaging arc, which could cause further damage to the equipment. The resistor helps contain and dissipate the energy in a more controlled and efficient manner.

The 1820-28-A3 GDT is a reliable and cost-effective solution for protecting sensitive systems and equipment from transient over-voltage and other voltage surges. It is designed to help maintain optimal performance and efficiency, without the need for frequent maintenance or replacement. This allows these systems to operate with minimal disruption and downtime, and helps ensure reliable performance over their lifetime.

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