The nozzle parts 13, 14, together with a shoulder 19 integrally attached to the insulating material element 8 and of {TAIL ~ hollow design}, form the nozzle 9, by which the arcing chamber 2 and {HEAD ~ thus also the accumulator} 3 are joined to the expansion space 4 during a switching off operation 
The nozzle parts 13 , 14 , together with a shoulder 19 integrally attached to the insulating material element 8 and of { TAIL ~ hollow design } , form the nozzle 9 , by which the arcing chamber 2 and { HEAD ~ thus also the accumulator } 3 are joined to the expansion space 4 during a switching off operation
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