MotoSuiveur® motor follower Hoist Safety Device

The revolutionary MotoSuiveur failsafe brake from Siguren is a permissive safety system, which allows only safe operation of the hoist and protects against any mechanical or electrical hoist failures.

MotoSuiveur: An innovative load arrest device that redefines your safety case

The revolutionary MotoSuiveur failsafe brake is a permissive safety system that protects against dropped loads due to hoist or gearbox failures.

SCX Special Projects has implemented the MotoSuiveur safety device into advanced mechanical handling solutions at nuclear licenced sites, aerospace manufacturing facilities, and defence handling applications.

Download our brochure or read on for more details.


Integrated Mast & Crane Rig

  • 10m telescopic mast and 5m reach manipulator
  • 5t hoisting system with MotoSuiveur load arrest device
  • Remote control with full recovery


ILW Handling System

  • 32t bespoke twin-hoist design with 2x MS4 units per crane
  • Fully independent recovery drives
  • Two tier rotating grapple
Fuel Handling System

  • 120t safe working load
  • Loose article control
  • MotoSuiveur MS7 load arresting safety system


Nuclear COTS Crane Solution

  • Cost-effective COTS crane solution for the nuclear industry
  • Proven commercial design combined with failsafe technology
  • Supports multiple hoists for a wide range of applications

The elements of a MotoSuiveur device

Annotated diagram of a MotoSuiveur® unit


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

  • Load Arrest - Protection against any hoist or gearbox mechanism failure, excluding the rope
  • Overspeed - Protection, both mechanically and via firmware controls
  • Drop Height - Load is arrested within 30° rotation of the drum
  • 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.

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

A MotoSuiveur® unit with a diagram showing load arrest rotation of 30°

A MotoSuiveur unit with a diagram showing load arrest rotation of 30°


Load arrest within 30° of drum rotation

The MotoSuiveur motor follower consists of a worm and wheel gearbox mounted directly to the hoist drum. The worm is a permissive system 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. Dependant on rope and barrel configurations, this could translate to a load drop of as little as just 15mm before arrest.

A commercial hoist upgraded with MotoSuiveur

The incorporation of a MotoSuiveur motor follower unit means the reliance on the integrity of the motor, gearbox, drum or shaft is reduced, allowing for the incorporation of a torque limiter between the motor and gearbox which provides mechanical protection against any overload. E.g. 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 motor follower system has revolutionised the safety of hoist braking. Please use the contact form below to request a demonstration.

MotoSuiveur® mobile demonstration kit

MotoSuiveur® mobile demonstration kit

Let's talk more about the MotoSuiveur safety device

We always find that the best outcomes are achieved by talking with us sooner. That way, we can explore all the possible solutions before committing to a course of action.

And if you'd like to see the MotoSuiveur in action, we'd be very happy to arrange a demonstration.

Call us on +44 114 243 1142, email us at [email protected], or complete the contact form below and we'll be in touch.

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SCX Special Projects Ltd
Roman Ridge Road,
Sheffield, S9 1GA
Tel: +44 (0)114 243 1142
Email: [email protected]
An SCX Company