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