Preventing Switch Failure

Screen Shot 2015-08-31 at 1.13.32 PMDisconnect switches have the important role of isolating circuits and equipment on any modern power grid.  When a switch is open, operators can easily confirm this; however, it is nearly impossible to visually confirm a perfect closed connection. Improperly seated switches have led to switch burn outs and power outages coupled with high costs for utility companies.

The idea of a disconnect switch may seem simple, but from the ground, it’s surprisingly difficult to determine if a switch is properly functioning. The issue is the switch blade must establish a high degree of contact pressure between the switch jaws in order to generate the necessary current. Due to inclement weather, defective equipment or operator error, a switch may remain partially open or un-rotated unbeknownst to technicians, causing burnouts and failures.

Southern States has solved this issue with a new switch technology called MACI or Magnetically Actuated Close Indicator which provides unambiguous visual confirmation for disconnect switches.

Screen Shot 2015-08-31 at 1.16.48 PM

A colorful red indicator provides a ‘closed confirmation’ from 100 ft. away

MACI provides an unambiguous, binary indicator, which only shows when blade is fully seated and rotated. MACI has magnetically coupled linkage, which ensures the indicator never interferes with switch operation even in severe weather. Watch the video below to see MACI in action.



-Visibility up to 100 ft.

-Magnetic switch that does not interfere with mechanism

-Unambiguous binary signal

-Retrofitted to any vertical break or any double end break switch

-Rated for 245kV and above / 115kV available 1Q16

Submit a Comment

Your email address will not be published. Required fields are marked *