In a Zuendunterbrecher with axially displaceable, centrifugally displaced Hülse whose outer surface verkoerpert the Verstellkennlinie should be avoided according to the task changes due to Zuendzeitpunktes due to wear. According to the invention, this is done by electrically leitfaehige stiffeners on the Mantelflaeche, the settlement of the Verstellkennlinie corresponds and on which rest substantially axially offset two sliding contacts of the Zuendstromkreises like a commutator. Fig. 1
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