Electrical panelboard with integrated arc fault protection

An electrical panelboard comprising:

• a main terminal configured to receive a supply of electricity;
• a plurality of branch circuit terminals configured to supply electricity to branch circuits, wherein the branch circuit terminals are (a) stabs configured for connection to overcurrent circuit breakers for the branch circuits or (b) fuse holders configured for connection to fuses for the branch circuits;
• a bus structure configured to distribute the supply of electricity from the main terminal to the branch circuit terminals;
• current sensors electrically coupled to conductive paths between the bus structure and the branch circuit terminals, wherein the current sensors are configured to sense a flow of electricity through the branch circuits;
• switching devices electrically connected between the bus structure and the branch circuit terminals;
• wherein the switching devices are configured to interrupt the flow of electricity in the branch circuits;
• and
• a processing system that analyzes current signals from the current sensors, detects arc fault events based on the analysis, and controls the switching devices to interrupt the flow of electricity to the branch circuits in response to detecting arc fault events.