Ringfeder® trailer coupling RF50 AM/RL CD

The new generation of the best-selling air-assisted all-round workhorse for most applications within medium and heavy transportation - equipped with an analogue coupling sensor (CSM DIN 72585)

Semi Assisted
Semi Assisted

Ringfeder® trailer coupling RF50 AM/RL CD ,


A convenient quick operation air opened coupling for hinged or rigid drawbars. It is the ideal solution for underslung positioning. The self-closing and automatically secured coupling provide high safety and long-term reliable performance. The pneumatic opening makes it ergonomic, time-saving and improved productivity for the driver.

A robust and easily maintained safety device adds further to safety.
The coupling is equipped with a reinforced guiding funnel which is easily replaceable.

This trailer coupling is equipped with an analogue coupling sensor (CSM DIN 72585) to connect to the existing electrical infrastructure of the previous generation. For example, to replace an already installed trailer coupling of the previous generation (e.g., type 5050 AM/RL), if the already installed ECU (previous model) is still to be used.

Or to use to connect to a Mercedes-Benz truck with a pre-installed locking indication (ex-factory via Code Q9A) via the Ringfeder adapter for code Q9A.

For other cases like first installation the new electrical infrastructure with the digital CSM is recommended.


Locking mode is shown by a built-in LED light indicator, and the signal (red/green) is clearly visible also in the dark. By connecting a passive fibre optic cable to the indicator, the signal be displayed on any location, e.g. on the side of the vehicle.

Choose variant


The Original Wireless Solution

Ringfeder Red Line (AM/RL)

Fast and ergonomic
The Ringfeder original air mechanism / Red Line adds a convenient pneumatical opening, with 50% higher closing power compared to a standard coupling. Air assisted operation makes coupling and uncoupling significantly faster and more ergonomic for the driver.

Works with your current installation
Connect your Ringfeder AM/RL coupling to the existing compressed air supply of your truck, and operate with your control unit of choice. No installation of a separate compressed-air line needed. Compatible with Duomatic, Palm, C-coupling and Valve box.

Why should I choose this?

This Ringfeder coupling is an ECE certified high-quality product that requires minimal service and maintenance. It is easy to operate, and you will have the most reliable performance. Full support and global spare part availability, together with long, trouble-free service life, provides the excellent Ringfeder value to owners and users.

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A high-quality product
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Easy to operate
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The most reliable performance
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Full support and spare part availability
RF oiler.


Avoid tricky manual lubrication and extend product life by the Ringfeder Automatic Oiler.

Documents / Manuals

Are you missing a certain document?

You will find all documents under Support.

Go to support