Does the hotel need to be equipped with contactors to plug in the card to get electricity?

The only devices that plug in the card to get electricity are optocoupler circuit and relay.

If the contact capacity of relay contacts is not large, the current controlling a contactor is similar.

If a kettle or air conditioner is used in the room, this current will burn out the relay contacts in the power extractor.

Contactors should be controlled by relay contacts of current collectors, and the main circuit of the whole room should be controlled by contacts of contactors.