THE SAFEST CIRCUIT BREAKER FOR SHORT LINE FAULT CARRYING HIGHER LOAD WITHOUT SWITCHING RESISTOR IS ?

A. AIR BLAST CIRCUIT BREAKER

B. OIL CIRCUIT BREAKER 

C. SF6 CIRCUIT BREAKER 

D. MCB



Answer :

SF6 CIRCUIT BREAKER

Explanation :


SF6 gas is widely used as arc quenching medium in HV applications today. Sulfur hexafluoride gas is a high electronegative gas having excellent dielectric and arc quenching properties. High dielectric and insulating properties of SF₆, make it possible to design high voltage circuit breaker with smaller overall dimension, shorter contact gap. Excellent insulating property helps to design and construct indoor type high voltage switchgear.