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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
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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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