Power supply shutoff device and power supply shutoff method

A power supply shutoff device comprising:

• a movable section configured to travel on a traveling path provided along a board production line in which multiple board work machines, which perform a predetermined board work on a board, are installed side by side;
• a driving section provided in the movable section and configured to cause the movable section to travel by using supply electric power supplied from the board work machine with non-contact power feeding;
• a power supply device configured to generate electric power;
• a power distribution section configured to distribute the electric power generated by the power supply device to each of the multiple board work machines;
• an electric power supply circuit provided in each of the multiple board work machines and configured to generate the supply electric power to be supplied to the driving section by using the electric power distributed via the power distribution section;
• and
• a supply control section configured to stop a supply of the electric power to the electric power supply circuit when drive electric power for driving the board work machine is shut off in at least one board work machine among the multiple board work machines, the supply control section including
• an electromagnetic contactor that is provided on an input side of the power supply device and capable of inputting AC power to the power supply device when an electromagnetic coil is excited,
• an excitation circuit that excites the electromagnetic coil, and
• a switch configured to break the excitation circuit to stop the supply of the electric power via the electromagnetic contactor when the drive electric power of at least one board work machine among the multiple board work machines is shut off.