The hotel plug in the card to get electricity with air conditioning. The air conditioner won't work for a while. What happened?

This is generally not the case, because the relay in the card power switch has little load capacity. If the electricity in the whole room, such as lights, sockets, air conditioners and other electrical appliances, is switched from the card power switch, it will definitely burn out because of overload. Therefore, in general, the card power switch is controlled by the contactor. The card power switch only controls the coil of another contactor, and the contact wire is the bus that controls the room.