Sandro - that's what I had in mind.
The UL, Jan. 28,2002 article "Arc Fault Testing & Arc Fault Scenarios" lists 6 different product categories for AFCI devices. The UL product category/Type definition for AWBZ is: AFCI, Outlet Branch Circuit Type (aka: AFCI Receptacle)- 'A device intended to be installed as the first outlet in a branch circuit. It is intended to provide protection to downstream branch circuit wiring, cord sets, and power supply cords against the unwanted effects of arcing. This device also provides protection to upstream branch circuit wiring. It is intended to be provided with or without receptacle outlets.'
...sounds like it does a heck of a job.
I don't have the direct link to this UL article but this is the link to the UL AFCI Categories page - www.ul.com/regulators/afci/categories.html