How To Choose Uc And Up Of The Surge Protector Of The Distribution Box? - Up Selection

The impact voltage rating Uw of various equipment in the three-phase power distribution system

The above are the impact voltage ratings Uw of various equipment. When we choose the Up of the surge protector, generally Up≤0.8*Uw, leaving a 20% margin to ensure effective protection of the equipment.

How to choose the Uc and Up of the surge protective device of the distribution box? The Uc and Up values ​​of the surge protector are positively correlated. When the Uc value is high, the Up is also high. On the contrary, when the Uc value is low, the Up is also low. Therefore, it also shows that the higher the Uc value, the better. When selecting these two parameters, the requirements of the protected equipment should be put first, and the appropriate Uc and Up values ​​of the surge protection device should be selected according to the situation of the electrical equipment to ensure effective protection.