UIC Leaflet 736 - railway signalling relays; replaced by IRS 70736 since 2022.
The document concerns relays used in railway signalling systems with functional-safety requirements. IRS 70736 provides technical specifications that limit hazards in relay installations and recommendations covering the full relay life cycle; it is accompanied by the UIC technical report "Use of Signalling relays".
The document applies to fixed infrastructure (railway signalling).
A relay compliant with UIC 736 / IRS 70736 meets railway-industry requirements for safety relays (hazard control over the life cycle), which infrastructure managers accept as a basis for approval.
