3 of GB 50057-2012: A surge protector of Class I test should be installed at the main distribution box where the power supply is introduced. The voltage protection level value of the surge protector should be ≤2. How to determine whether the on-site distribution box should be equipped with a primary surge protector? How to determine some basic functions and parameters? Today, the editor will give you a detailed introduction on how to choose a primary surge protector. Essential components include miniature circuit breakers (MCBs), residual current devices (RCDs/RCBOs), busbars, and Surge. Type 1, Type 2, and Type 3 SPD (Surge Protective Device) — also called Class I, Class II, Class III — are the three device types defined in IEC 61643-11, each covering a different installation point and surge energy level. Type 1 SPD installs at the service entrance to handle direct lightning. A distribution box is a low-voltage electrical enclosure that receives incoming power and distributes it safely to multiple outgoing circuits through protective and switching devices such as MCBs, RCDs, RCBOs, fuses, isolators, busbars, neutral bars, earth bars, and surge protective devices. Properly sizing your surge protective devices is essential for maintaining long-term system reliability and performance. As someone who's spent years supplying quality SPD components to system. This SPD should have 8kA current capacity. Pick SPDs that can handle power frequency overvoltage. Each SPD level needs protection. Make sure the breaking capacity is higher than the biggest short-circuit current.
