Electrical junction box and wire harness

A wire harness, comprising:

• a power supply-side electric wire to be connected to a power supply side;
• a load-side electric wire to be connected to a load side;
• and
• an electrical junction box comprising:
• a conductive input busbar electrically connected to the power supply-side electric wire;
• a conductive output busbar electrically connectable to the input busbar and the load-side electric wire;
• a semiconductor relay electrically connected to the input busbar and the output busbar and configured to switch a connected state and a disconnected state of the input busbar and the output busbar;
• a substrate having mounted thereon a control circuit configured to output a control signal for controlling the semiconductor relay;
• and a control terminal electrically connecting the control circuit and the semiconductor relay to each other to output the control signal to the semiconductor relay, wherein
• the semiconductor relay is mounted on at least one of the input busbar and the output busbar, and the input busbar, the output busbar, and the semiconductor relay are disposed away from the substrate.