This voltage is used for taking measurement. The voltage varies for 0.5V to 200V. The voltage is created on a coil(inductor) due to induced emf when a current flows through a primary conductor using Faraday's current law..The voltage above 25V is due to fault current in the primary conductor which I dont require to measure. So from 0.5V to 25V I want the actual voltage and above 25V to 200V I want the voltage to be clamped at 25V.I hand winded this coil using a copper wire in a iron plates. It is working fine.. The voltage is getting induced in the coil when I place the coil near to conductor which carries current. I have trial and error and fixed a no of turns so that 1A at primary 1V at secondary. I dont know much theory nor I am a professional on this design its just trial and error. Can anyone help to find a component which can do my job? Please help!!!