Lanyard Breakaway Switch Safety Alert

Lanyard breakaway switch general owner inspection alert for Caravans and trailers over 2000kg only.

Safety switch lanyards are approximately 120cm long. On the other hand, safety chains are 64cm long.

Surprisingly, when lanyards are installed incorrectly, it is impossible to disengage the breakaway pin, as intended.

The manufacturer perfectly matches breakaway lanyards with safety chains.

When the pin is pulled, safety chains are approaching full extension of the safety chains.

Further, this test is efficiently completed by attaching your chains to the tow bar and push your rig backwards.

In extreme circumstances, electric brakes are not engaged when the caravan or trailer to becomes detached from the tow vehicle.

The minimum period for an electric brake system application is 15 minutes.

Couplemate recommends the following inspections by owners and inspection stations.

  • Firstly, check the lanyard is shorter than the caravan safety chains.
  • Secondly, ensure breakaway switches are affected by water ingress, thereby causing failure when the pin is detached.
  • Thirdly, pull the pin on your breakaway before every journey to test current flow to the electric brakes. You should hear your magnets engage.
coil breakaway switch

Coil Breakaway Switches can be dangerous

Electric brake magnets make an audible sound when engaging. As a result of not hearing your magnets engage, take your rig to your service centre for investigation.

CM702-Breakaway Instruction-Sheet

Lanyard Coil Breakaway Switches

We do not recommend coil breakaway switches. Although they appear high tech, this type of connection cannot be adjusted to pull the breakaway pin in an emergency.

For example, with the chains at full stretch in an emergency situation, this type of coil lanyard cannot be pulled therefore, cannot engage trailer brakes.

Lanyards must be installed correctly and checked at every service by a caravan dealer.

Breakaway Pins

Breakaway pins are subject to UV degradation. Replace the breakaway switch once the pin brakes due to age.

Copper Contacts

Install breakaway switches facing forward for the pin to be pulled forcefully during detachment.

Inspect the inside of the switch contacts for signs of dirt which causes failure during testing.

A breakaway switch with rubber boot cover can be purchased here.

A breakaway switch may have to delivery 12.8 Amps to four magnets on a tandem rig. If the contacts are dirty, excessive heat is in the cable.

Lanyard Breakaway Test Failure

With the chains connected and jockey wheel on the ground, push the caravan so that the safety chains are at full stretch.

If the pin fails top pull, measure the slack lanyard and shorten. If the breakaway switch fails after being pulled, we recommend switch replacement and be sure to include a rubber boot to help prevent future water ingress.


Notably, breakaway switches are designed to engage electric brakes if the trailer or caravan becomes detached. During excessive sway, caravans can become dislodged.

When the pin is pulled, the electric brakes are immediately engaged, thereby stopped the sway and braking the caravan to a stop.
© Steve Wotherspoon 2th January 2018