On the connecting line of varistor.

The connecting wire for connecting the varistor into the circuit should be thick enough, and the size of the general connecting wire Note: If the grounding wire is above 5.5 mm2, the connecting wire should be as short as possible and straight, because the impulse current will generate additional voltage on the inductance of the connecting wire, which will increase the limiting voltage at both ends of the protected equipment.

 The flow rate of varistor is ≤ 600a (600 ~ 2500) a (2500 ~ 4000) a (4000 ~ 20k) a.

Wire cross-sectional area ≥ 0.3 mm2 ≥ 0.5 mm2 ≥ 0.8 mm2 ≥ 2 mm2.

For example, if there are 3 cm long wires at both ends of the varistor MY, its inductance L is approximately 18 nH, and if 8/20 impulse current of 10 KA flows into the varistor, and the current rising speed is regarded as 10 kA/8 μ s, the additional voltages UL1 and UL2 on the lead inductance are approximately Ul1 = Ul2 = L (di/dt) = 18× 10-9 (10.