What is the difference between 3-pole and 4-pole?

A 3-pole circuit breaker has a connection for the three wires of a three phase system (phase 1: brown, phase 2: black, phase 3: grey) with a 4-pole having an additional connection for the neutral (blue) of the supply. Old installations may still use red, yellow and blue cable colours.

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What is the difference between 3-pole and 4-pole?