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Glossary of terms related to surge protectors

  1. Nominal Voltage, UN: Rated voltage of the system to which the surge suppressor will be applied. (3.46)

For power system: 110V, 220V, 380V, etc.

For communication systems: 6V, 12V, 24V, etc.

  1. Max. Continuous Operating Voltage, UC: The highest voltage at which the surge suppressor can operate continuously. Typically 120% of nominal voltage. If a surge suppressor is exposed to voltages exceeding this value, it will overheat and fail within seconds (3.11).

  1. Max. Discharge Current, Imax: 8/20㎲ waveform current that the surge suppressor can withstand only once. (3.8)

  1. Nominal Discharge Current, In: 8/20㎲ waveform current that the surge suppressor can withstand 15 times. Generally, it is about half of the maximum discharge current. (3.10, 7.8.4)

  1. Voltage Protection Level, UP: Voltage that appears across both terminals of the surge suppressor when nominal discharge current (In) flows through the surge suppressor. Also called Clamping Voltage or Let-through Voltage. (3.15)

  1. Response Time: The time until switching begins when a surge voltage higher than the maximum continuous operating voltage is applied to the surge suppressor. While the waveform of the surge voltage is displayed in ㎲, the response time is displayed in ㎱ or ㎰.

  1. Protection Mode: The surge suppression element of the surge suppressor is connected between line to line, line to earth, line to neutral, or neutral to earth. This suppresses the surge between the two points, and this connection path is called protection mode. (3.7)

  1. Nominal Current, IN: Load current that the surge suppressor can flow. (3.14)

Applies to series surge suppressors.

For power system: 8A, 10A, 20A, etc.

For communication systems: 20mA, 100mA, 500mA, etc.

  1. Continuous Operating Current, IC: Current flowing in a parallel surge suppressor at the highest continuous operating voltage. If more current than this flows continuously, the surge suppressor will overheat and fail within a short period of time. 50uA, 1mA, 2mA, etc. (3.2 of KS C IEC 61643-12)

  1. Insertion loss: The ratio of the voltage appearing on both ends of the line before and after insertion at the surge suppressor insertion point. It is generally used to indicate the loss of a surge suppressor connected to a communication system at a certain frequency, and the result is expressed in dB. (3.21)

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