Raychem Circuit Protection GDTs are commonly used to help protect sensitive telecom equipment such as power lines, communication lines, signal lines and data transmission lines from damage caused by transient surge voltages that typically result from lightning strikes and equipment switching operations. GDTs are placed in front of, and in parallel with, the sensitive equipment and act as a high impedance component while not influencing the signal in normal operation. However, in the event of an overvoltage surge, such as a lightning strike, the GDT switches to a low impedance state, and diverts the energy away from the sensitive equipment. Due to their low capacitance, the GDTs also have less signal distortion than other overvoltage protection technologies.
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