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What do 3P 2T, 3P 3T, 4P 3T, 4P 4T mean in regard to Merlin Gerin circuit breakers?

What do the P (pole) and T (trip) ratings mean for Merlin Gerin breakers?

Product Line:
Merlin Gerin

Molded Case Circuit Breakers

P is for number of poles and T is for number of poles capable of initiating a trip. Example: A 3P 2T would be a 3 pole circuit breaker with 2 protected poles (capable of initiating a trip). All poles open and close together.
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