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I'm no electrician but I think this is a double pole 25x2 50amp and one side is bad. Would love to hear your thoughts. Thanks much.
Just to be clear that is not how the breakers work. Each pole or phase has the ability for 50 amps but that doesn't give you 100 amp capacity -- or 25 amps on each phase. If it were 25 amps per phase then a hot tub that requires 50 amps at 240V would not be able to work without tripping the breaker. When a tub that is rated 240v and 50 amps that means the tub will need 50 amps on both hot wires. But that is still 50 amps at 240v.

I may have confused you more. lol
 
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