Interrupting Medium
Interrupting Medium : The "fluid" used to interrupt the flow of electric current in a switch or circuit breaker. In high power equipment, this may be oil, insulating gas or even no material, as is the case of vacuum interruption which works because in a vacuum there is no material that can be ionized to perpetuate the flow of electric current when the contact par and an arc tries to form. Air also can be used as an interrupting medium where the design of the interrupter is such that a stream of air blows-out and cools the arc path
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