According to the number of classification are: unipolar, diode, triode, quadrupole.

According to the rated current classification are as follows: 1 a, 3 a, 6 a, 10 a, 16 a, a, 20 a, 32 a, 40, 50, a a, 63 a

According to the rated working voltage classification: 220/380 v (unipolar is 220 v, two extremely 220/380 v, 3, 4 is 380 v)

According to the instantaneous trip points are: C, D, C is suitable for the power distribution protection, D type is suitable for motor protection