Final answer:
The mandatory type of AFCI device in the panel for branch circuit origination is the combination type AFCI, which protects against various arcing faults to prevent fires.
Step-by-step explanation:
The type of Arc Fault Circuit Interrupter (AFCI) device that is mandatory in the panel where the branch circuit originates is known as a combination type AFCI.
This device provides protection by detecting a wide range of arcing electrical faults to help reduce the likelihood of the electrical system being an ignition source of a fire. The National Electrical Code (NEC) typically requires the use of AFCIs on most residential branch circuits, including bedrooms, living rooms, and other similar areas.