Selection Of Maximum Continuous Operating Voltage Uc Of Surge Protector
The following figure is the description in the GB50057 standard: The maximum continuous operating voltage of the surge protector should not be less than the minimum value specified in Table J.1.1; when the power supply voltage deviation at the installation location of the surge protector exceeds the specified 10% and the harmonics increase the voltage amplitude, the minimum value of the maximum continuous operating voltage specified in Table J.1.1 should be increased for the voltage-limiting surge protector according to the specific situation.
Note that the maximum continuous operating voltage Uc of the surge protector is calculated according to the phase voltage, which is why many primary surge protectors have a Uc value of 255V~320V, but can be used in three-phase 380V systems. Similarly, a surge protector with Uc385V can also be used in three-phase 400V, 420V, and 440V systems.
Anxun Lightning Protection provides a variety of maximum continuous working voltage surge protectors for AC systems, such as maximum continuous working voltage: 150VAC, 275VAC, 385VAC, 420VAC, 460VAC, 510VAC, 750VAC, 800VAC, 1000VAC, 1500VAC, etc.
In the conventional single-phase 220/230V three-phase 380/400V system in China, it is recommended to choose Uc275V~385V products. Some other special application scenarios such as 480VAC, 690VAC and other systems require the configuration of other voltage products.
