Here is that info I posted at MHE regarding the AFCI breaker manufactured by Cutler-Hammer that is meant for use on Multiwire circuits:

Following quote is from FPN notes pertaining to CJH215AF, CJH215GFAF, CJH220AF, CJH220GFAF 2 pole AFCI Breakers on the bottom of page 3 in th ePDF File linked below.
Quote
2-Pole AFCI breakers are designed for use in 3-wire, 120/240V AC circuits, 120V AC multiwire circuits utilizing a shared neutral (often referred to as a “home run” circuit), and 240V AC circuits obtained from 120/240V AC source.

https://www.ch.cutler-hammer.com/docs/Fred/apscpgh/htmL/550000/F5.PDF

Bill

Bill