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I suppose you could but I don't think you should. It might depend on the brand, maybe someone else will know for sure. The tie bar is just a safety device to ensure both legs are always turned off together. They are there to make sure no one accidentally works on a 240v or multiwire circuit with one leg unknowingly left hot. Double pole breakers should have a common internal trip, so if one trips so will the other one regardless of the tie bar. If you seperate the handles and use them as individual breakers and one trips so will the other anyway.
I have some 20amp double pole breakers can I remove the "pin" and use them as single pole breakers?
If the breaker is able to be seperated & installed as individual breakers, it should workbut bear in mind it will void your CSA or UL approval. If for example there is an insurance investigation for an insurance claim it will nullify your claim because you have now use an unapprove product because you have remove the tie bar.