Formal Proof Process for the Safety of a Signaling System

The process of formally proving safety for a signaling control system consists of two stages: Phase 1: Through an in-depth […]

SAFETY RELAY – VITAL RELAY RS4: Traction control command

RS4 relays are the only relays that can be used in on-board applications. A critical on-board application was deployed to […]

SAFETY RELAY – VITAL RELAY RS4: Automatic landing door control systems

RS4 safety critical relays (also qualified as vital) are used to drive the “Closed and Locked” safety signal in interface […]


  RS4 relays are used as interface relays to ensure SIL4 operation of the crossing. For signaling applications, RS4 relays […]

SAFETY RELAY – VITAL RELAY RS4: Signaling applications

RS4 relays are used in new signalling systems. Their features and ease of installation save space and allow the entire […]

Safe power management system for the Paris T12 tramway line

The power management system for the 3 sections of the T12 tramway line requires a SIL3 safety level according to […]

CLEARSY supplies the platform screen gate monitoring system for the Honolulu metro

The Honolulu metro is equipped with STANLEY platform screen doors, which are controlled by the HITACHI Automatic Train Control (ATC) […]

Luxembourg, 2021: the GARE station is ready for the tramway’s arrival

As part of the GARE extension (1 maneuvering area), CLEARSY provided Mobility with a software and hardware service in a […]

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