Air conditioner

A household electrical appliance 100-1 is characterized by being provided with: a low-voltage circuit 8 that outputs a low voltage; a low-voltage terminal 5; a high-voltage terminal 4; and a switch 6, which is disposed between the low-voltage circuit 8 and the low-voltage terminal 5, and which brings the low-voltage circuit 8 and the low-voltage terminal 5 into a connected state when an alternating current voltage is applied to the high-voltage terminal 4, and which brings the low-voltage circuit 8 and the low-voltage terminal 5 into a non-contact state when the alternating current voltage is not applied to the high-voltage terminal 4. The household electrical appliance is also characterized in that a component can be prevented from breaking even in the cases where a high voltage is applied to the low-voltage terminal 5.