A vehicle electric system comprising: one or more circuits, the one or more circuits comprising a plurality of modules, each module of the plurality of modules (301; 311-316; 411-416; 511-516), comprising: an arc fault detection unit comprising: one or more sensors configured for monitoring an alternating current circuit or a direct current circuit for signs of an arc fault and configured for outputting arc fault data, and signal conditioning circuitry for receiving and translating arc fault data for processing, a processing unit; connected directly or indirectly to the signal conditioning circuitry, the processing unit configured to receive arc fault data from the signal conditioning circuitry and configured to identify an arc fault condition, and a notification device connected to the processing unit, the notification device configured to notify a supervisory controller (317; 417; 517, 518) of an arc fault and configured to communicate other data to the supervisory controller, and the supervisory controller (317; 417; 517, 518) networked to the plurality of modules, wherein the vehicle electric system is configured with a plurality of remote contactors, wherein each module of the plurality of modules (301; 311-316; 411-416; 511-516) is configured to supervise a respective one of the alternating current circuit or direct current circuit to collect and process arc fault data; wherein each module of the plurality of modules (301; 311-316; 411-416; 511-516) is configured to transmit arc fault detection data to the supervisory controller (317; 417; 517, 518); and wherein the supervisory controller (317; 417; 517, 518) is programmed to manage current flow in the vehicle electrical system by commanding one or more of the remote contactors to open, disabling current flow to the one or more circuits, when an arc fault condition is detected. one or more circuits, the one or more circuits comprising a plurality of modules, each module of the plurality of modules (301; 311-316; 411-416; 511-516), comprising: an arc fault detection unit comprising: one or more sensors configured for monitoring an alternating current circuit or a direct current circuit for signs of an arc fault and configured for outputting arc fault data, and signal conditioning circuitry for receiving and translating arc fault data for processing, a processing unit; connected directly or indirectly to the signal conditioning circuitry, the processing unit configured to receive arc fault data from the signal conditioning circuitry and configured to identify an arc fault condition, and a notification device connected to the processing unit, the notification device configured to notify a supervisory controller (317; 417; 517, 518) of an arc fault and configured to communicate other data to the supervisory controller, and an arc fault detection unit comprising: one or more sensors configured for monitoring an alternating current circuit or a direct current circuit for signs of an arc fault and configured for outputting arc fault data, and signal conditioning circuitry for receiving and translating arc fault data for processing, one or more sensors configured for monitoring an alternating current circuit or a direct current circuit for signs of an arc fault and configured for outputting arc fault data, and signal conditioning circuitry for receiving and translating arc fault data for processing, a processing unit; connected directly or indirectly to the signal conditioning circuitry, the processing unit configured to receive arc fault data from the signal conditioning circuitry and configured to identify an arc fault condition, and a notification device connected to the processing unit, the notification device configured to notify a supervisory controller (317; 417; 517, 518) of an arc fault and configured to communicate other data to the supervisory controller, and the supervisory controller (317; 417; 517, 518) networked to the plurality of modules, wherein the vehicle electric system is configured with a plurality of remote contactors, wherein each module of the plurality of modules (301; 311-316; 411-416; 511-516) is configured to supervise a respective one of the alternating current circuit or direct current circuit to collect and process arc fault data; wherein each module of the plurality of modules (301; 311-316; 411-416; 511-516) is configured to transmit arc fault detection data to the supervisory controller (317; 417; 517, 518); and wherein the supervisory controller (317; 417; 517, 518) is programmed to manage current flow in the vehicle electrical system by commanding one or more of the remote contactors to open, disabling current flow to the one or more circuits, when an arc fault condition is detected.