AL-KO UN3500 overrun device with AK351 hitch for 3500 kg trailer with V-type drawbar
AL-KO UN3500 overrun device with AK351 hitch for 3500 kg trailer with V-type drawbar
The UN 3500 overrun device from AL-KO is a versatile solution for V-shaped trailers and flatbed trailers with a total weight of 2000 kg to 3500 kg . It has a maximum permissible vertical load of 350 kg, ensuring optimal load distribution between the trailer and the towing vehicle. The UN 3500 is equipped with an AK 351 ball coupling , ensuring a stable connection to the vehicle, and is compatible with the AL-KO 2361 braking mechanism.
An overrun device is an advanced solution that significantly improves the safety and comfort of driving with a trailer or flatbed trailer. Its use shortens stopping distances and maintains a stable driving path when braking the combination . The device automatically brakes the towed vehicle, cooperating with the vehicle's braking system, supporting its operation and improving traffic flow. Using an overrun device not only increases road safety but also helps reduce wear and tear on the towing vehicle's braking system. Furthermore, this device is also extremely functional when stationary, effectively preventing the vehicle from rolling forward or backward.
The device offers two mounting options: top or bottom of the drawbar , providing flexibility in adapting to different trailer designs. However, note that the maximum permissible drawbar height for bottom mounting is 100 mm. This mounting versatility allows for optimizing weight distribution, adapting to different trailer designs, and adapting to specific application requirements, ensuring the device's safety and efficiency in a variety of applications.

AK 351 ball hitch
The installed AL-KO AK 351 ball hitch ensures a solid and secure connection to the towing vehicle. Made of durable cast iron, it ensures maximum durability and load resistance. Additionally, the hitch is equipped with advanced safety systems: a hitch wear indicator , which informs when components need to be replaced, a correct coupling indicator , ensuring proper connection, and a miscoupling protection , which eliminates the risk of accidental disconnection while driving.

Anti-corrosion protection
The overrun device with a hot-dip galvanized steel housing utilizes advanced anti-corrosion technology. The galvanizing process creates a durable coating over the entire surface of the component, effectively protecting against rust, corrosion, and mechanical damage. The housing withstands extreme weather conditions, including moisture, road salt, and temperature fluctuations , which is crucial for devices constantly exposed to harsh road conditions. This protection ensures the device retains its properties for a long time, minimizing the need for maintenance and replacement. This translates into long-term savings and reliability during trailer operation.