Methods, systems, and apparatus for detecting arc flash events using current and voltage

A power circuit protection system (100) includes a current sensor (106) configured to measure a first current level through a conductor of the circuit (104), a voltage sensor (110) configured to measure a first voltage level across a plurality of conductors of the circuit (104), and a controller (116) communicatively coupled to the current sensor (106) and to the voltage sensor (110). The controller (116) is configured to receive a first signal from the current sensor (106), wherein the first signal is representative of the first current level, and receive a second signal from the voltage sensor (108), wherein the second signal is representative of the first voltage level. Based on the first signal and the second signal, the controller (116) is configured to determine whether to activate a first circuit protection device (112) or a second circuit protection device (114).