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Back in the 80's I used to try to get the A/C man to use 3 phase just because I hated to waste having 3 phase available. They refused because it cost more.
I believe NEC now outlaws using a 3 phase breaker in a single phase panel.
I have seen (and know where they are right now, in use) what we called a widow-maker breaker. used 3 spaces in a single phase panel, A, and B plugged into busbar, C had no busbar connection, rather 2 wires on it (supply and load)
 

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Here is link to a post from way back showing photos of a delta breaker.

 
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