arrow left
arrow right

MotoSuiveur® Load Arrest Device

As part of a new lifting solution, or retrofitted to existing equipment, the MotoSuiveur load arrest device from SIGUREN technologies provides unparalleled protection against multiple causes of dropped loads. MotoSuiveur is not a hoist brake, it’s something revolutionary and innovative. It transforms your approach to crane safety.

MotoSuiveur: An innovative load arrest device

MotoSuiveur protects against uncontrolled loads caused by hoist brake, gearbox, motor or control system failures, including overspeed and overhoist scenarios.

The MotoSuiveur load arrester meets the recommendations of the Office for Nuclear Regulation’s ONR Technical Assessment Guide 56 (TAG 56) for Nuclear Lifting Operations in addressing a range of lifting challenges.

The elements of a MotoSuiveur load arrest device

In the case of uncontrolled loads, safety concerns which arise from traditional hoist safety brakes can all be solved via the integration of the MotoSuiveur load arrest device. The concerns solved by the MotoSuiveur unit include:

  • Load Arrest – Protection against any hoist or gearbox mechanism failure, bar the rope
  • Overspeed – Protection, both mechanically and via firmware controls
  • Drop Height – Load is arrested within 30° rotation of the drum, as little as 30mm of drop
  • Overload Protection – Allows incorporation of a torque limiter
  • Independent Recovery – Optional independent recovery mechanism


A MotoSuiveur can replace multiple safety systems to deliver permissive safety in a single independent device, reducing complexity, implementation time and cost. And, because it isn’t a friction-based calliper brake, its response times are significantly faster.

As the exclusive supplier of the MotoSuiveur device, SCX Special Projects has not only installed them on numerous nuclear licenced sites, but also for aerospace and defence applications too.

Load arrest within 30° of drum rotation

The MotoSuiveur load arrest consists of a worm and wheel gearbox mounted directly to the hoist drum. The worm is a permissive system that only operates if fully functional and healthy, and which allows the wheel and barrel to rotate at any speed within the hoist’s normal operating parameters.

Any large differential acceleration between the worm and wheel will cause the system to mechanically lock, safely arresting the load. This provides mechanical failsafe protection in the event of any electrical or mechanical failure.

Should an arrest situation occur, hydraulic damping of the worm absorbs any impact force, bringing the load to a safe stop within 30° rotation of the drum. Dependent on rope and barrel configurations, this could translate to a load drop of as little as just 30mm before arrest. Compare this to traditional hoist safety brakes and the difference can be substantial.

A commercial hoist upgraded with MotoSuiveur

The incorporation of a MotoSuiveur load arrest device means the reliance on the integrity of the motor, gearbox, drum or shaft is reduced.

 This allows for the incorporation of a torque limiter between the motor and gearbox which provides mechanical protection against any overload, such as in the event of a snagged load or double blocking.

When an arrested load is being held by the worm and wheel, an optional integrated independent recovery motor can drive the worm to remotely recover the arrested load.

Come and see the MotoSuiveur in action

We actively encourage people to see for themselves how the innovative design of the MotoSuiveur load arrest device has revolutionised hoist safety.

Click the button below to contact us for a demonstration.

Technical Details

More of our capabilities