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We have the control transformer in our drive line up incomer panel. The primary of control transformer is fed through MPCB of appropriate rating form incomer section. Whenever we are switching on the supply for the first time, MPCB is tripping. After some time, the problem is rectifying upon itself. I thought that initially the impedance of transformer will be very less, so it is tripping like that. But I am unable to justify it, Can anyone help me please.............