Four Door Interlock – VCRX4

  • Model: VCRX4
  • Lock – Door: 4
  • LED indicators: 4
  • Cables: 4 meters
  • Material: Plastic, Inox

Interlocking lock is an auxiliary device that helps ensure that the doors of a room cannot be opened simultaneously, thereby ensuring isolation between clean and non-clean areas.


  • Installed in the panel rooms of cleanrooms, buffer rooms, airlocks, intermediate rooms, changing rooms using indicator light systems in the fields of healthcare, laboratories, pharmaceutical production facilities, electronics, semiconductors, and office spaces, among others.
  • Used for entrance doors, emergency exit doors, and safety doors.

Reasons for choosing our products

Our products have wide applications in the pharmaceutical industry and factories with cleanrooms.

  • Four-door interlocking: The system automatically checks whether all four doors are closed; if one door remains open, it will emit a warning signal (the warning device will continuously sound) to remind the user to close the remaining three doors.
  • Product structure: It consists of three components: control equipment, electric control locks, and electronic touch sensors.
  • LED display lights: The outer shell is made of plastic, combined with LED display lights, making it more visually clear and easy to operate.
  • High isolation capability: This interlocking lock device is specifically designed for air isolation in cleanrooms, often used in shock reduction rooms or compressed air lock chambers within cleanrooms.
  • Guaranteed materials: Exquisite material selection, high stability, low power consumption. This system uses a computer chip for entry, which has high stability, high accuracy, compact size, and full functionality. The system’s power consumption is less than 12W, generating minimal heat, resulting in a longer lifespan for the lock and making it an ideal product for the clean industry.


  • Four-door electronic interlocking lock
  • Electric control lock voltage: 12V
  • Power supply: 220V; 50Hz
  • Lock wire: 3 meters, 4 strands
  • Voltage to LED lights: 5V
  • The lock is fully imported.


  • Control equipment

  • Mechanical lock or electronic lock


  • When one door opens, the other two doors will automatically close, ensuring that three doors cannot be opened simultaneously.
  • If a door remains open for an extended period without closing, a signaling bell will ring to remind staff to close the door.
  • In case of power loss and for electronic interlocking locks, all three doors can be opened to ensure user safety.
  • In emergency situations, an emergency button can be pressed to forcibly open the door.


  • The interlocking lock control unit will be installed on the ceiling panel, connected to an available socket (the shorter the distance between the control unit and the socket, the better, to match the power cord along the lock and save wiring costs).
  • The indicator lights will be mounted on the wall panel, in an easily observable area when entering/exiting, often placed beside the panel door.
  • The lock latch will be installed inside the panel door (requires drilling and wiring inside), it can be installed on the side or above the door frame.

Electronic interlocking lock VCR X2, X3, X4 has gained the trust of Ha Hung Pharmaceutical Factory, Hai Phong Medical Material and Equipment Factory, Davina Factory, Amepro Pharmaceutical, Dai Bac Pharmaceutical, Hoa Linh Pharmaceutical, Military Central Accelerator Center – 108 Central Military Hospital, among others.

In addition, there are some important points to consider when installing interlocking locks:

  1. Securely connect the signal wires to the lock latch and indicator light —> Error message: The alarm will sound loudly and continuously.
  2. Install the lock latch and latch locator in the same direction (Wi-Fi symbol) on both accessories —> Error message: The latch does not work.
  3. Reverse the signal wires between the light and the lock latch —> Error message: Unable to install. The signal wire of the lock latch is usually slightly larger than the wire of the light; customers need to be aware of this when installing.
  4. Use wire boxes and wire conduits to protect the signal wires on the ceiling, avoiding damage from insects. Signal wires are different from power wires; if they are cut or damaged, they will be difficult to reconnect.

Actual images and videos

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See more about the VCR interlock list

Learn more about interlock.

Catalog of VCR interlocking locks can be found here.


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