Which of the following circuit breakers has high reliability & minimum maintenance? 

(A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB 
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Which of the following circuit breakers has high reliability & minimum maintenance? 

(A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB 

by
SF6 has highest dielectric capacity.but maintainence is too costly since SF6 converts to SF4 andSF2 and it is highly poisness.

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