ENCRYPTED iButton access control controller – BulKey BKU519

44,60 (excl. VAT)

In stock

BKU519 is a ENCRYPTED iButton controller, which is used for access control of doors, elevators and many others.

  • Easy to install and mini size
  • Affordable Split system
  • Event memory
  • Fast socket connections

NEW! Control your controller via an app from your phone! Learn more on the BulKey App product page! There is also a FREE version.

SKU: BKU519 Category:

 ENCRYPTED iButton contact access control controller BulKey BKU519, puts an END to UNCONTROLLED KEY COPYING, through innovative encrypted iButton chip technology. It is an efficient solution for locking home, office and public entrance doors using electromagnetic locks and electronic keys, as well as the ability to electronically lock elevators by blocking the call and floor selection buttons.

For example, if you have an encrypted control system in your elevator (with BKU519) and a standard system on your common entrance door (with BKU419), the encrypted iButton F3 key can work with both. The standard key can only work with the standard front door system. If someone tries to make a duplicate of the encrypted iButton F3 key, the duplicate will only unlock the standard system, but not the encrypted system in your elevator.

NEW! Control your controller via an app from your phone! There is also a FREE version. Change settings with just one click. Quickly and easily add new keys or keep track of who activated access control when. Learn more on the BulKey App product page!

The equipment of the system includes:

  • Controller BKU519,
  • Preprogrammed Encrypted F3 Master key
  • Electronic reader LRD34
  • Detailed documentation.

What is BKU519?

BKU319 is a stand-alone ENCRYPTED iButton controller for access control and management of electronic locks – the “brain of the locking system”.

BKU519 works with special encrypted iButton F3 keys , which cannot be copied by locksmith! The encrypted keys working with BulKey BKU319 have 128 bit dynamic code and are extremely good value for money and protect the key from being copied by standard copying devices. They are suitable for access control for building doors and elevators. An advantage is that they can also be used on standard unencrypted systems, allowing one key to be used for many different devices.

Unlocking from the outside is done by an electronic iButton key  which approaches the reader of the device mounted in a place of your choice. The controller works with simple and very affordable vandal-resistant readers that are very small in size and could be mounted on the door or on the door frame.

A single electronic key can be programmed to unlock and lock many doors (eg home, garage, basement, building front door, elevator, etc.). It can be easily and quickly prohibited or allowed its operation to a given door. Each electronic key is programmed in the system with an individual number, which allows it to be deleted without its presence, and all other keys continue to function normally.

Unlocking from the inside is done by pressing a button (for Bolt type and electromagnet locks) or by pressing the door handle (for counter type locks) or it could placed a second electroni readed for double sided access control. 

Split system
BKU519 combined with a reader represents the so-called Split system. This means that the reader and the controller are independent and can be mounted at a distance from each other. So if the reader (as the only visible part of the entire system) is attacked and broken, it will NOT unlock the door.

BKU519 is controlled by a master card (or key), with which system operation is set and electronic keys are recorded, erased, disabled. The device can also be controlled via computer, smartphone, remotely via SMS or via the Internet (modules are purchased separately). The method of programming, recording, erasing, status of a specific key, total number of keys in the system are described in the detailed instructions attached to the product and according to the algorithm patented by the LESI company. The reader and controller are built directly into the door frame, making the system extremely vandal-resistant! For your convenience, in addition to the detailed product description, we have also made tutorial videos on how to operate the keys

Apart from master key, it can be controlled by computer or phone app. The phone app also has a free version with which you can quickly and conveniently change settings to monitor events and keys. Check out more on the BulKey App product page HERE

Each system can be configured to network with others like it. The systems are addressable, allowing networking and common management via a single GSM or LAN communicator.

More details about access to the system with a password can be learned after purchasing the specialized software with data cable BulKey of the company LESI.

Hardware protections of BKU519

  • Protection against electronic key scanning
  • Short circuit protection and power supply polarity reversal
  • Protection from electric shock batons (when reader plate is inserted)
  • Resin covered PCB

Application of the autonomous iButton access control controller Bulkey BKU519 for electronic locking and access control to entrance doors. They control an electromagnetic lock of the Magnet type, an electronic lock with a spike of the Bolt type, an electromagnetic counter and others. The principle of operation is as follows: On the outside there is a reader with an LED that lights up red when the lock is locked and green when it is unlocked. A valid electronic key is fed to the reader, the lock unlocks in 15s with a door sensor installed or in 5s without a door sensor and the door can be opened. When the door closes, lock is automatically locked (if this mode is selected). From the inside, the lock is unlocked by pressing a button in the case of installed magnet or bolt type locks, or by the door handle in the case of a counter type lock.

Application of the autonomous iButton access control controller Bulkey BKU519 to control access to elevators by turning off the floor selection buttons in the elevator cabin, the principle of operation is as follows: The reader is installed in the cabin, which allows or not the selection of the floor by the buttonhole. The reader has a two-color LED which, if lit red, indicates that the floor selection buttons are disabled. After submitting an electronic key programmed to the system, the reader’s LED lights up green and enables the operation of the floor selection button for a period of 5 seconds (adjustable from 1 sec to 4 min). After


  • Intelligent control of electromagnetic locks – strike, DropBolt, electromagnet
  • Electronic keys – iButton and compatible
  • Ability to work with up to 999 keys
  • Ability to connect to a computer protected by a master key or password
  • Possibility of remote control via GSM or LAN communicator
  • Ability to use the access control system
  • Ability to network many systems for integrated building management
  • User programming of the system
  • User registration, deletion and temporary prohibition of operation of a specific key through the master key
  • Checking the total number of keys saved in the system
  • Check the status of each key
  • Ability to delete, replace or change the status of a lost or unavailable key
  • Transistor output 3A for controlling the lock
  • Input for quick unlock or lock button on the inside
  • Control input from intercom systems
  • Reader with light indication – three colors
  • Two modes of operation of the lock – automatic or manual
  • Monitoring the position of the door – open/closed
  • Ability to control the operation of the Unlock button – works/does not work
  • Function of automatic protective reactivation of the system when the door is unlocked and not opened
  • Programmable sound indication in case of alarm or emergency conditions
  • Programmable function Door bell
  • Light indication of the lock status – unlocked/locked
  • Electronic key scanning protection
  • Protection against electronic and electromechanical impacts and electric shock baton – only applies to control units working with iButton type electronic keys
  • System power failure indication
  • Extremely easy installation, maintenance and programming

Additional information

Weight 0,2 kg
Dimensions 4 × 1 × 1 cm
Event Memory

Security level

Power supply voltage

DC 12V

Type keys


User capacity


LESI-2000 Ltd, Bulgaria

Max current


Operating current

max. 50A

Operating temperature

-40 to +60 'C

Output type

Open Collector

Output activation time

4s to 15s (it can be manually chosed)

Compatible with NC and NO locks


Possibility of control from an intercom


Door position input




Light indication


Modes of operation

Automation and Manual (can be chosed anytime)


BulKey App, Computer, GSM

Average Rating


( 12 Reviews )
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12 Reviews For This Product

  1. 12

    by Alexandre Lambert

    Our doors got a serious upgrade with this access control controller. It’s the VIP pass to a stress-free office life. Solid 5 stars!

  2. 12

    by Erik

    I like the metal reader it feels really vandal-proof.

  3. 12

    by Jackson

    I like that it has a manual mode. Not many controllers on the market have it!

  4. 12

    by Luca Leclerc

    Just received it and it looks as described, and with detailed documentation! I purchased it together with 8pcs. F3 keys. It took 7 days shipping to France.

  5. 12

    by Martiniq

    Got the access control controller, and now our office feels like it’s on autopilot—in a good way.

  6. 12

    by Ketrina Jenson

  7. 12

    by Ars45

  8. 12

    by Amir

    this access control thing is a lifesaver. Simple, effective, and it just gets the job done.

  9. 12

    by SamiM

  10. 12

    by Benjamin Reed

    Top-notch quality!

  11. 12

    by Ryan Cooper

    Fast shipping and it comes with detailed instructions.

  12. 12

    by William

    Truly encrypted! Nobody can copy the keys

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