Can you replace a 15/20 breaker with a 20/20 breaker, or replace it with a 15/15 breaker. I have tried to find a 15/20 breaker but can't find them anywhere.
You need to consider what the breaker feeds, most outlets are 15amps, while some lites are on a 20 amp, turn off the 20 & see what does not work, this is what the 20 feeds, now do the same with the 15, toasters & micro wave outlets can draw more than 15amps & might need a 20, WHY do you need to replace the breaker? most places like Home Depot or Lowes should have what you need, I sugest you go to a 15/15 befor you go to a 20/20.
15/20 that sure sounds like a weird, specialty combination.
Trying to kludge it with a 15/15 or 20/20 will probably violate your electrical code in some manner. The former may leave you with insufficient capacity in a place like your kitchen (as well as having 20 amp outlets with their cross slot on a 15 amp circuit) and the latter may overload wiring that is not rated for it.
If your electrical box allows it, you may be able to put a 15/15 where there had been a single 15, or a 20/20 where there had been a single 20. Then fill your original 15/20 with a single 15 or single 20. Keep the moved circuit on the same phase as the original. If any of this does not make perfect, clear sense, call a professional electrician. He (or she) might even be able to dig up the correct breaker from old stock.
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