CLEARSY
The CLEARSY company
CLEARSY was founded on January 1, 2001 by the team of engineers responsible for the industrialisation of the formal modelling tool called Atelier B, used in the railway sector to produce safety software.
CLEARSY: safety systems engineering
We are a French SME, specialised in the realisation of safety systems and software from level SIL1 to SIL4. We develop complex systems by ensuring their design, their validation, verification and safety study, right up to their commissioning.
CLEARSY produces safe systems and software in the railway, automotive, military, space and nuclear fields.
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News
Successful commissioning of CLEARSY’s automatic train stop system in Corsica
27 November 2025 | Offers
On November 3, 2025, CLEARSY’s SIL2-certified KFS automatic train stop system was successfully commissioned by Mobility on the Corsican French […]
The SCK-CEN has renewed its confidence in CLEARSY’s RS4 range of safety relays
26 November 2025 | Energy/nuclear
The SCK-CEN (Centre for Nuclear Studies) has renewed its confidence in CLEARSY’s RS4 range of safety relays for the Emergency […]
CLEARSY at the Heart of RSSRail 2025
19 November 2025 | Company
CLEARSY at RSSRail 2025: a key role in the organization and scientific program. CLEARSY will play a leading role at […]
HEXANA entrusts CLEARSY with the definition of sodium reactor control system
18 November 2025 | Company
CLEARSY has been assisting French start-up HEXANA with the design of the control system for its sodium-cooled reactor since May […]
Increased reliability with CLEARSY’s relays on the Paris Metro line 14
13 November 2025 | Company
CLEARSY’s RS4 safety relays are used by RATP for the safe management of platform screen door closure in metro stations. […]
CLEARSY: French railway safety in the spotlight at the Élysée Palace
13 November 2025 | ERTMS
On 15 and 16 November 2025, the autonomous train ECOTRAIN, selected for the “Made in France” exhibition at the Élysée […]
Safety software and systems
All our security systems and software available below. If you have a specific problem, contact us.
operational systems
