The difference between a primary surge protector and a secondary surge protector

May 20, 2022

What is the difference between a primary surge protector and a secondary surge protector?
First of all, we have to know the division standards and usage requirements of primary surge and secondary surge,
The first-level surge protector is the surge protector for the T1 test. The T1 test refers to the product surge impact test waveform of 10/350us.
The secondary surge protector is the surge protector of the T2 test, and the T2 test refers to the product with an impulse waveform of 8/20us.
The national standard requires a first-level surge protector for the main incoming cabinet of the electrical system, and a second-level surge protector for the distribution cabinet after the first level.
So the main differences between primary and secondary surge protectors are:
1. The test waveforms are different
2. The installation location is different