It provides power to 3 conductors simultaneously, and more importantly, disconnects all three conductors simultaneously in case of a fault. A three pole breaker is used with a three phase power system.
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Replacement for American Switch single pole 15 amp circuit breaker
can a 20 amp double pole circuit breaker be used for 2 different 120 v circuits using 14 - 2 wire
3 pole circuit breakers are used for 3 phase lines
No, you cannot use one in place of the other.
is there an error if the upstream circuit breaker is 16A TP and the downstream circuit breaker is 16A TPN?