Answer / vinayak

The gapless metal oxide technique is used to achieve
non-linear characteristic.
In this technique Zinc Oxide grains with controlled
impurities of Bismuth Oxide and Antimony Oxide are
introduced to the resistor.
The micro-structure hence formed have execellent non linear
characteristic.
This technique is used in the formation of Lightening/Surge
Arrestor which are used in the protection.

I am an electrical power engineer and arranged power system for a data center, I installed MCB, ELCB and erthing system TN-C-S. But some times several ELCBs Disconnect circuits at the same time! what may be the reason? (the ELCBs are 25A ,30mA)

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