Brush VV6 vacuum circuit breakers (VCB) accessible now from Slaters Electricals. Ans) Sf6( sulpher hexa fluoride) gasoline is used as an arc quenching medium in circuit breakers. As it’s vacuum, the metal on the contact surface is definitely vaporized resulting from that hot spot and create a conducting media for arc path. PG mcb vacuum … Continue reading Frequency Drive (VFD)