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How is the Up value determined in an SPD with multiple protection modes (such as L-N, L-PE, N-PE)? What is the important guiding significance of SPD selection Jun 26 , 2026
According to the standard, the declared Up value of a multi-mode SPD is the maximum residual voltage value measured across all its protection modes. For example, for a three-phase SPD, if the residual voltage is 1.5 kV in L-PE mode, 1.8 kV in L-N mode, and 2.0 kV in N-PE mode, then the Up value of this SPD should be specified as 2.0 kV. This means that the protection level provided by this SPD to ...
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Why need to specifically focus on parameters such as "insertion loss," "return loss," and "bandwidth" in high speed lines (such as Gigabit Ethernet) SPDs? Jul 10 , 2026
Signal SPD (Surge Protective Device) protects high-frequency data signals. Its primary function is to minimize interference with signal transmission quality while providing surge protection. Traditional parameters such as residual voltage (Up) and surge current capacity (In/Iimp) ensure the "survival" of the equipment, while the parameters mentioned above ensure the "communication" of the system. ...
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