I was sold a tandem breaker,looks like i needed a double pole circuit breaker for my range top/oven. The tandem breaker shows 120 volts at each line, but together there is zero voltage, instead of 240 volts.How did the old tandem breaker power my oven for all those many years?

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    what kind of panel do you have? Can you shoot us a pic of old and new breaker? – Harper Apr 27 at 18:15
  • Did the new breaker go back in exactly the same position? Each leg has to be on a different bus bar to deliver 240. A tandem that lands both contacts in a single bus will not – Kris Apr 27 at 20:18

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