How To Select Gas Discharge Tube?

• DC spark-over voltage: It is defined as the breakdown voltage measured with a rising voltage of 100V / S or 1000V / S, which is called the DC breakdown voltage, and generally falls within the range of ± 20% of the nominal DC breakdown voltage;

• Impulse spark-over voltage: It is defined as the breakdown voltage measured with a rising voltage of 100V / uS or 1000V / uS called the pulse breakdown voltage;

• Nominal impulse discharge current: It is defined as the nominal impulse discharge current refers to the 8 / 20μs lightning strike current that the discharge tube can withstand;

• AC discharge current: refers to the 50HZ mains power frequency AC current capability that the discharge tube can withstand;

• Insulation resistance: a certain voltage is applied to the two ends of the discharge tube, and the insulation resistance is measured;

• Capacitance: It refers to the selection of the parasitic capacitance value of the two ends of the discharge tube. The voltage of the ceramic gas discharge tube;

• DC spark-over voltage: The DC breakdown voltage must be greater than the maximum working voltage of the circuit being protected. Due to the high pulse breakdown voltage of the ceramic gas discharge tube, a two-level lightning protection concept should be considered when selecting and designing. Avoid high residual voltage and damage to the protected circuit IC. Selection of ceramic gas discharge tube flux;

• It is generally selected according to the requirements of the lightning protection test level of the customer's product to determine the flow capacity and corresponding size specifications of the selected discharge tube.

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