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Q.4) You have been asked the following question in an interview. What would be your answer to the interviewer? While designin

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while designing SF6 circuit breaker,it is necessary to provide arc resistance coating over fixed and movig contacts because to assist arc quenching,contacts need to have high resistance and since arcing mainly associated with contacts,these contacts heat up more hence to limit arcing phenomena and to withstand high temperature,contacts are coated with arc resistance material.

Tungsten material has both high resistance and high temperature withstand capability

Hence,the tips of fixed and moving contacts are coated with copper tungsten arc resistant material.

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