ENCRYPTED RFID 125kHz access control controller – BulKey BKU517

44,6053,10 (excl. VAT)

BKU517 is a ENCRYPTED contactless RFID 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
  • Keys CANT be coppied!

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: BKU517 Category:

 ENCRYPTED RFID contactless access control controller BulKey BKU517, puts an END to UNCONTROLLED KEY COPYING, through innovative encrypted RFID 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 BKU517) and a standard system on your common entrance door (with BKU417), the encrypted RFID L1 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 L1 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 BKU517,
  • Preprogrammed Encrypted L1 Master key
  • Electronic reader (choose from options)
  • Detailed documentation.

What is BKU517?

BKU517 is a stand-alone ENCRYPTED RFID controller for access control and management of electronic locks – the “brain of the locking system”.

BKU517 works with special encrypted keys with Lesi type RFID protocol, which cannot be copied by locksmith! The encrypted keys working with BulKey BKU517 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.

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
BKU517 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.

BKU517 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.

The BKU517 has a programmable event memory. With it, you will be able to review who unlocked and opened the door when, or when an unknown key was passed to the reader. Thanks to the built-in clock, you will be able to see the exact date and time of the event.

Hardware protections of BKU517

  • 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 RFID access control controller Bulkey BKU517 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 RFID access control controller Bulkey BKU517 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 – contactless RFID 125kHz ASK EM 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


( 45 Reviews )
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45 Reviews For This Product

  1. 45

    by Abul Lend

    The small size is truly impressive and convenient for installation directly into the door frame. The instructions are detailed and very informative.

  2. 45

    by Martin67

    Fast shipping to Netherlands. The controller works as described and the keys cannot be copied.

  3. 45

    by Angel Sirev

    I have 3 of these controllers and they work flawlessly. I bought my first 7 years ago and it works like a brand new! Now I ordered 2 more and the delivery was fast.

  4. 45

    by Stefan Ern

    Really good product. Came with complete and detailed manual. Fast shipping to Belgium (5 days)

  5. 45

    by Sebastian Schmidt

    I buy these controllers since 2015 and I haven’t got any defect or problem with them. These are one of the most reliable, durable and fool proof controllers I’ve ever worked with.

  6. 45

    by Javier Rodriguez

    As described

  7. 45

    by Finnegan M

    I like that i can use encrypted keys in standard systems as well. Really convenient.

  8. 45

    by Sven

    These controllers are truly a gem. Affordable price and top-notch performance!

  9. 45

    by Jakob E

    Everything corresponds to the description, excellent product, highly recommended

  10. 45

    by Henrik Sørensen

    I use BKU517 together with BKU417 for two of my doors. So far everything is great and controllers perform really well in cold weather. (-10C)

  11. 45

    by Johan

    I am satisfied with the controller.

  12. 45

    by Leonidas

    Πολύ καλό

  13. 45

    by Hugo Alvarez

    I am so happy to find such quality product, manufactured in Europe. I am tired of all cheap, broken products from China. I recommend it!

  14. 45

    by Filip Novák

    Excellent product. Works perfectly. Includes instructions in the box, very intuitive.

  15. 45

    by Antonis Vlachos

    One of the best controllers out there! I bought it for elevator access control, and my neighbors who don’t pay the bills already tried to duplicate the keys but they couldn’t!!! Recommend to everyone.

  16. 45

    by Raul

    The controller is great! It works as described, and keys CANT be copied for sure! (i tried it myself hahah). The shipping was a bit slow, but the support team did their best to resolve the issue, and i got the package.

  17. 45

    by Liam

    Great support and the instructions with the product are detailed!

  18. 45

    by Antoine Z

  19. 45

    by Anton Litz

    The controller is easy for installation and the sockets are really convenient. I literally connected my entire system in half an hour. I recommend this product.

  20. 45

    by Andrey

    I’ve been using BKU controllers for a while now, and overall, it’s been a solid experience. They work really well and has made my daily life much easier. The interface is intuitive, and I appreciate the effort put into user-friendliness.

  21. 45

    by Arvid

    Good priced access control, with a good instruction manual in English easy to understand and configure.

  22. 45

    by Nikolai Petrov

    Good quality controller, and fast shipping.

  23. 45

    by Johnatan

    After implementing BKU517, we’ve been more than happy with its performance. The system is reliable, and its functionality aligns well with our security requirements

  24. 45

    by David

    The documentation is too long, but I guess it’s better than a short one. The product itself works good and as described. We use it for our office building and it truly provides security with the encrypted keys.

  25. 45

    by Julian

    A bit slow shipping (2 weeks to Germany) but the product is good quality, and as described. Even smaller size than expected.

  26. 45

    by Moritz

    I love the new button the company put on the board! It makes it so easy to change some of the functions. Thanks!

  27. 45

    by Maksim

  28. 45

    by Raluca Stoian

  29. 45

    by Anton Popov

    Good product with exceptional support. I had difficulty integrating it into my intercom system and they helped me a lot by email.

  30. 45

    by Kalin

    This one of the smallest controllers I’ve ever used! The functions that it offers are more than enough and the price is more than good. Thanks LESI

  31. 45

    by Nico S

  32. 45

    by Luca

  33. 45

    by Boris

    All good

  34. 45

    by Erik

  35. 45

    by Elena

  36. 45

    by Jozef

  37. 45

    by Olivier E

  38. 45

    by Petros Kiriakou

  39. 45

    by Liviu Voicu

  40. 45

    by Alexandru Tudose

    I use BKU517 together with BulKey App and works perfectly. I easy control and secure.

  41. 45

    by Marin Ertumos

  42. 45

    by André Dubois

  43. 45

    by Malina

    The product is good and seller is communicative.

  44. 45

    by Adam Hansen

    I like the controller, it is small and easy to use, and most importantly secure. I wish we can have more colors of the readers. However I painted mine so it matched the door and it turned out great.

  45. 45

    by Isaac D

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