Hotel energy saver switch and DND/MUR: how do they work?

A hotel energy saver switch is the card holder by the room entrance: when the guest inserts a key card, it powers the room's selected circuits, and when the card is removed it switches them off after a short delay. A DND/MUR panel is its partner at the door, letting the guest signal Do Not Disturb or Make Up Room to housekeeping without opening the door.

Together with the card lock, these devices form the basic layer of hotel room automation. This guide covers how each one works, which circuits to control, where a presence sensor helps and how to plan everything for new and renovated hotels.

How does a hotel energy saver switch work?

The principle is simple:

1. The guest enters and places the key card in the energy saver.
2. The switch recognises the card and its relay energises the selected room circuits.
3. When the guest leaves and takes the card, a delay timer starts.
4. At the end of the delay the controlled circuits switch off. Circuits that must stay live are wired separately.

The General Kilit energy saver connects directly to 220 V and has a built-in relay, so a standard room needs no extra relay. It is offered with a 40 A rating and a 20-second delayed switch-off, accepts IC, RF and MIFARE hotel lock cards, fits existing wall boxes and has a fire-resistant white plastic frame. For hotels without electronic locks there is a version with an infrared (IR) switch.

Which circuits should the energy saver control?

The answer comes from the room's electrical design, not from the switch. Common scenarios are:

Where the air-conditioning runs on VRF, fan-coil controllers or a building management system, a dry-contact (volt-free) relay output passes the occupied or empty signal without carrying mains voltage. All 220/230 V connections, breaker sizes and wiring routes should be designed and installed by a qualified electrician or electrical engineer under local regulations.

Does an energy saver cut all power when the guest leaves?

No, and it should not. A well-designed room keeps the minibar and any equipment that must stay on outside the controlled circuits, and where the HVAC system allows it, the air-conditioning can drop to an energy-saving mode instead of switching off. How much energy is saved depends on occupancy, climate, the HVAC system, room loads and guest behaviour, so treat any fixed percentage promised for every hotel with caution. A measured trial in sample rooms gives a more reliable figure for your building.

What does a presence sensor add?

A card-operated switch has one weakness: a guest can leave a spare card in the holder and the room stays fully powered. A presence sensor detects occupancy even when nobody is moving, so it can tell an occupied room from an empty one with a card left inside. When no presence is detected for a set time, the room control can put the air-conditioning into standby and dim or switch off the lights, then restore comfort settings when the guest returns. Detection time and sensitivity are adjusted per project so that the room does not switch off while a guest is asleep or reading.

How do DND and MUR panels work?

General Kilit doorbell DND/MUR systems have two parts: a touch unit inside the room and a panel outside the door, with the doorbell connected to the system.

• DND (Do Not Disturb): the guest touches DND, the outside panel lights the DND indicator and the doorbell switches to silent.
• MUR (Make Up Room): the guest touches the cleaning button and the outside panel lights the MUR indicator for housekeeping.
• Room identity: the room number and hotel logo can be added, with a standard frame or a larger frame that is easier to read from a distance.
• Extra services: the modular design lets icons such as newspaper, dry cleaning or ironing be added or removed.
• Build: a 100 % glass front, SMD LEDs that draw only milliamps and fire-resistant materials.

The IDEA doorbell adds a Check-In indicator that shows staff whether guests are in the room without anyone having to knock. For renovations, Wi-Fi versions such as the WOULD Wi-Fi doorbell avoid chasing walls for new cables, so rooms can be upgraded with less disruption to operations.

The card lock adds its own privacy cue: when a guest deadlocks a General Kilit card lock from inside, its reader shows a red do-not-disturb light outside.

How should you plan the lock, energy saver and DND together?

The three systems do different jobs (access, energy, and communication between guest and housekeeping), but they share the card, the wall space by the door and the wiring routes. Planning them as one package avoids most site problems:

• New build: fix the positions of the energy saver, the inside DND unit and the outside panel, and the cable routes, during electrical design and before walls are closed.
• Renovation: survey the distribution board, room circuits, HVAC type, existing cards and mounting space first, and consider Wi-Fi doorbells where cabling is difficult.
• Card compatibility: test the hotel's cards in the energy saver and on the lock before ordering.
• Sample room: fit the lock, energy saver and doorbell in one or two rooms, test card recognition, switching, HVAC behaviour and indicator visibility, then approve the rollout.

What documents should a specifier request?

Ask for wiring diagrams, load ratings, written card compatibility and declarations of conformity. Telcom's declaration of conformity for a KNX touch DND/MUR hotel doorbell lists the Low Voltage (2014/35/EU), EMC (2014/30/EU) and RoHS (2011/65/EU) directives and standards including EN 50491-5-1, EN 50491-5-2 and EN 60669-2-5.

Next steps

Read how hotel RFID door locks work to align the card technology, and the installation guide for the fitting order on site. See how the products combine on the hotel solutions page, then send your room count, HVAC type and required functions through the quotation form.