A gas blast switch has a housing which encloses {TAIL ~ an arcing chamber}, {HEAD ~ an accumulator space} and an expansion space 
A gas blast switch has a housing which encloses { TAIL ~ an arcing chamber } , { HEAD ~ an accumulator space } and an expansion space
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH