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A single pole AFCI circuit breaker can be used on a 120v circuit derived from a single leg of a 208/120v. A two pole AFCI circuit breaker can be used on a shared neutral circuit between two adjacent 120v circuits.
The two-pole CAFCI is intended for a different use than most two-pole circuit breakers. This CAFCI is intended to allow contractors to use multi-wire branch circuits (commonly known as "shared neutrals") which helps save on installation costs. It is intended for use on two single-pole, 120Vac circuits. In fact, at the time of this print, there is not even a safety standard written that defines the requirements for AFCIs in 240V applications.
Please see attached documentation for more information on the use of two pole AFCI circuit breakers.
