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This paper presents a summary of a Honeywell collaborative IR&D project with University of Toronto on current arc fault detection and protection (AFDP) circuits and systems for the aerospace industry. Arc fault detection and protection pose a significant challenge for airlines, aircraft manufacturers, the military, and regulatory agencies such as the FAA. Most of the AFDP research and technology development efforts to date have concentrated on the detection of parallel arc faults because of the ease of differentiating them from other operating conditions due to their high energy levels and potential for serious damage. In contrast, series arc fault currents are limited by the electrical load and are thus more difficult to detect.