Connectors transmit current, data and sometimes even gas and liquids. They are required to be robust, lightweight, durable, resistant to dust and moisture, and above all guarantee the desired connection, especially in hazardous environments.
Locking technology : Which one to choose so that your connectors only release when required
March 10, 2025 · 3 min readBut what happens if there are vibrations or shocks in the environment, or if someone accidentally pulls on the cable ?
This article explores how to select the appropriate locking system for your application, so that a secure connection is guaranteed under all circumstances.
Push-Pull Connector
The Push-Pull locking system is the best to prevent unintentionnal disconnection. Slightly raised ‚lugs‘ lodge themselves into the corresponding recesses within the receptacle when the plug is inserted, producing a distinctly audible „click“. This anchorage prevents accidental disconnection by simply pulling on the cable. To unhook the plug, the user must first push it back into the socket to release the lugs, before pulling the connector out effortlessly. Depending on the size of the plug, this locking system can withstand several thousand newtons when exposed to traction on the cable. It is often used for medical appliances, where fast and reliable connections are required.
Push-Pull Variants : Lanyard with pull loop
Contaminated or radioactive environments may require connectors to be unplugged remotely using robots. The lanyard enalbles the articulated arm to disconnect the device with ease. This system is also used for ejection seats in combat aircraft.
Quick-Release
The Quick-Release system lacks the locking function mentioned above, nevertheless it still features lugs that provide the user with an audible „click“ indicating the connector is correctly plugged in. This design allows for simple disconnection by just pulling on the cable. In military environments, where swift disconnection can be crucial, this option may be particularly suited.
Tamperproof
To enhance reliability a screw-type safety device is incorporated into the plug. The Push-Pull mechanism can only be released by loosening the screw first. This is often used in high-voltage systems.
Screw-Locking
The Screw-Locking mechanism secures the connection by tightening a threaded nut, making it highly effective in high-vibration environments.
Ratchet
The Ratchet system employs a toothed locking device for progressive and precise locking. An internal ratchet engages in grooves during tightening, preventing unintentional loosening until a specific reverse motion is made. This system is extremely resistant to shock and vibration. Ideal for drones or car racing.
Friction
Another locking system relies solely on the frictional force between the contacts and housing to hold the connectors together. Similar to a laptop’s USB interface, these can be easily pulled out. The more contacts a connector has, the greater the force required to pull it out of the socket. While this system is less effective at preventing accidental disconnection, it is easy to clean and ideal for environments with strict hygiene regulations, such as hospitals.
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