A 240 volt breaker is nothing more then a TWO POLE breaker which is connected to BOTH hot phase legs L1 & L2 in a 120/240 volt single phase three wire panelboard. THEREFORE there exists between one/either of its output terminals and the Neutral GrounDED Buss 120 volts......
If you use BOTH legs (as you would for a 240 volt branch circuit) there exists between the two pole breaker output terminals 240 volts as thats the voltage from L1 to L2.......
If you examine the panelboard feeder busses which the breakers plug into, you will see that hot phase leg L1 and the other hot phase leg L2 alternate, therefore, two single pole breakers side by side are each fed from different phases, L1 or L2 and remember L1 to L2 = 240 volts but either leg to the Neutral GrounDED Conductor is only half that or 120 volts.
So YES if a two pole breaker is physically seperated into two single pole breakers, either could "work" as a 120 volt single pole breaker with 120 volts from its output to Neutral.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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