We have a design for ELECTRIC ARC (arc flash) in a medium voltage disconnector

To maximize operator safety, G&W has created a special design where the electrical disconnector tank can contain an internal electric arc fault of 25kA for 0.25 seconds in SF6 according to IEC62271-200 High-voltage switchgear and controlgear – Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV.
The tank is capable of withstanding a maximum pressure of 170 psi without rupturing. This ability to contain this pressure surge makes this tank ideal for pedestal or vault applications where venting is not required.
These switches are tested according to IEEE standards C37.72, C37.74, C37.60 and IEC265 applying to the TNI and GNI disconnector models.
The G&W Electric TNI is a two-pronged disconnector with the operating mechanism on one side and the connection bushings on the other. 630 A on the source-side and main busbar paths. 630 A continuous on the protected load-side paths.
The G&W Electric GNI is a single-sided disconnector with the operating mechanism and connection bushings on one side. 630 A or 900 A on the source-side and main busbar paths. 630 A continuous on the protected load-side paths.