From an e-mail requesting info...
Steve,
I would suggest that you contact the Siemens Energy and Automation helpdesk in Alpharetta, Georgia. They will be able to provide you with this information, and direct you to a local distributor. The number for the helpdesk is 1-800-241-4453.
Best regards,
Alexa Smith
Supervisor, SCAN CIC
Siemens Canada Limited
CIC@siemens.ca
Eventually, this led me to the old Siemens tec-support # in my area 1-978-685-6077.
and an 8 pg fax from the Mar/April 00' NFPA journal, a great dissertation on the attributes and styles of AFCI's , but no mention of any
( of the 5 styles)addressing a
multiwire circuit.
It is frustrating to talk to manufacture's that don't even know what they make