Railway applications - DC signalling relays; equivalent subject area to UIC Leaflet 736.
The standard specifies requirements for DC relays intended for safety-related applications in railway signalling installations. It applies to monostable relays; for bistable relays it may be used as guidance.
The standard applies to fixed infrastructure (railway signalling).
A relay compliant with EN 50578 has confirmed properties required of a safety signalling relay (including contact behaviour), which is a condition for use in interlocking circuits.
EN 50578:2013 is a CENELEC standard for DC signalling relays in railway-signalling interlocking circuits. UIC Leaflet 736 was an industry document issued by UIC and withdrawn in 2022 in favour of IRS 70736; the two documents are independent.
