The connection line of the varistor is faulty

Note: The grounding cable is over 5.5 mm2. The connection cable should be as short as possible and run in a straight line, because the shock current will generate additional voltage on the inductance of the connection cable,

increasing the limit voltage at both ends of the protected device.

The flow rate of the varistor is less than or equal to 600A (600 ~ 2500)A (2500 ~ 4000)A (4000 ~ 20K)A

Cross-sectional area of a conductor ≥ 0.3 mm2 ≥ 0.5 mm2 ≥ 0.8 mm2 ≥ 2 mm2

Such as: For example, if the varitor (MY) has a 3cm wire at each end, its level of inductance (L) is about 18 nH. For example, if a 10KA of 8/20 shock current flows into the varitor, think of the increase of the current as 10KA / 8

mpa, The additional voltage UL1 and UL2 on lead inductance are UL1= UL2=L(DI/DT)=18×10-9(10× 103/8 ×10-6)= 22.5V, which increases the limiting voltage by 45V.