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