1. The waveforms are different
Class I/T1 surge protector refers to products with a lightning test waveform of 10/350us, and Class II/ T2 surge protector refers to products with a lightning test waveform of 8/20us. 10/350us waveform energy is stronger than the energy of the 8/20us waveform, so many times the surge protector of T1 is generally 15kA, 25kA, etc.T2's surge protector does have 20kA, 40kA, 60KA, 100kA, etc.Although the value of the T2 class surge protector looks larger, but they test the waveform is different, in fact, the energy of T1 is stronger.
2.The installation location is different
The first-level power surge protector is mainly installed in the building, the outdoor large-scale main equipment power supply, the weak motor room, etc. The first-level power surge protector building total distribution cabinet, the outdoor high-power equipment distribution cabinet and so on. The secondary power surge protector is mainly installed in the distribution cabinet with input and output wire in the building.
The secondary power surge protector is mainly installed in the distribution cabinet with outdoor input and output line in the building.
3.The structure of internal components is different
The first-stage power surge protector is mainly used for the discharge of lightning current, and the products are mostly voltage switching type 10/350μs and limited voltage type, but the voltage limiting type is limited to the reason of components, which can only be limp15KA; The switching type can do limp25KA、limp35KA、limp50KA
The main role of the secondary power surge protector is to limit the overvoltage, and the product is a voltage-limited 8/20μs waveform
T1/ class I power surge protector and T2/ class II power surge protector are different, according to different needs to choose different types of surge protector is an important part of the power supply lightning protection.