What is the relationship between the abcd level of the surge protector and the 1234 level

What is the classification relationship of surge protectors?
Surge protectors are also called lightning protectors and surge protectors. Here, we mainly introduce the selection of surge protectors from the following aspects:

1. The meaning of surge protector level 1, 2 and 3, BCD level, T1 level and T2 level;
2. Selection of the maximum continuous working voltage Uc of the surge protector;
3. Selection of current capacity/discharge current Iimp, Imax, In of surge protector;
4. Selection of backup protection fuse and wiring diameter of surge protector;
5. Selection of surge protector protection mode (2P, 23P, 4P, 3+NPE, 1+NPE) and reference to the wiring diagram;
6. Selection of surge protector protection level Up;
7. Description of remote signaling alarm interface (dry contact)
8. General composite surge protector information (easy selection, worry-free acceptance, better protection effect);

3. The meaning of surge protector level 1, 2 and 3, BCD level, T1 level and T2 level

1. The first-level power surge protector, according to the national standard, refers to the surge protector of the T1 test (AM-10/350 series belongs to the first-level surge protector)
2. The secondary power surge protector, according to the national standard, refers to the surge protector with T2 test ≥ 40kA (AM40, AM60 series belong to the secondary surge protector)
3. Three-level power surge protector, generally refers to a 20kA surge protector (AM20 series belongs to three-level power surge protector)
4. Class B surge protector, including T1 test surge protector and T2 test surge protector with a flow rate of 60kA and above
(AM-10/350, AM60, AM80, AM100, AM120, AM160 series are all B-level surge protectors)
5. Class C surge protector refers to the surge protector with a maximum flow rate of 40kA in the T2 test (AM40 series)
6. Class D surge protector refers to the surge protector with a maximum flow of 20kA in the T2 test (AM20 series)
7. The T1 level refers to the T1 test level, the test waveform is 10/350μs, and the parameters are identified by the impulse current Iimp.
T2 level refers to the T2 test level, the test waveform is 8/20μs, and the parameters are identified by the maximum discharge current Imax and the nominal discharge current In.