Circuit switches were developed for fusing and substation power transformers and to overcome its drawbacks. SF6 Gas interrupters in the circuit switchers are designed to
provide 3-Phase Interruption and protection for transient over loads and over voltages at a better better price comparatively.
Also it can provide protection from power transformers bugs due to differential, sudden pressure, and over current relay schemas as well as critical operating constraints like low oil level, hight oil, temperature variations due to winding and pressure relief device operations.
New models were designed with advanced interrupters that will reduce the amount of gaps needed for good performance to a 1 Gap per phase, because it needs to eliminate the
necessity of the disconnect switch blades in series with interrupter.