A coupling includes a first portion configured for connection to a first shaft and having a first portion flange and a second portion configured for connection to a second shaft and having a second portion flange. The coupling also includes an isolating member disposed between the first portion flange and the second portion flange and that is formed of ceramic and electrically isolates the first portion from the second portion. The coupling also includes one or more connecting members passing through the first portion flange, the second portion flange, and the isolating member and holding the first portion flange and the second portion flange in a fixed relationship to one another.