Electrical relays - Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section One: Vibration tests (sinusoidal)
(Relais electriques - Vingt et unieme partie: Essais de vibrations, de chocs, de secousses et de tenue aux seismes applicables aux relais de mesure et aux dispositifs de protection - Section un: Essais de vibrations (sinusoidales))

Standard published on 30.9.1988

Electrical relays - Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section Two: Shock and bump tests
(Relais electriques - Vingt et unieme partie: Essais de vibrations, de chocs, de secousses et de tenue aux seismes applicables aux relais de mesure et aux dispositifs de protection - Section deux: Essais de chocs et de secousses)

Standard published on 31.10.1988

Electrical relays - Part 21: Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Section 3: Seismic tests
(Relais electriques - Partie 21: Essais de vibrations, de chocs, de secousses et de tenue aux seismes applicables aux relais de mesure et aux dispositifs de protection - Section 3: Essais de tenue aux seismes)

Standard published on 21.9.1993

Measuring relays and protection equipment - Part 216-1: Digital interface - General requirements and tests for protection functions using digital communication as input and output

Standard published on 11.8.2025

Measuring relays and protection equipment - Part 24: Common format for transient data exchange (COMTRADE) for power systems
(Relais de mesure et dispositifs de protection - Partie 24: Format commun pour l´echange de donnees transitoires (COMTRADE) dans les reseaux electriques)

Standard published on 30.4.2013

Measuring relays and protection equipment - Part 26: Electromagnetic compatibility requirements
(Relais de mesure et dispositifs de protection - Partie 26: Exigences de compatibilite electromagnetique)

Standard published on 24.1.2023

Measuring relays and protection equipment - Part 27: Product safety requirements
(Relais de mesure et dispositifs de protection - Partie 27: Exigences de securite des produits)

Standard published on 7.2.2023

Measuring relays and protection equipment - Part 27: Product safety requirements

Standard published on 7.2.2023

Direct acting recording electrical measuring instruments and their accessories
(Appareils de mesure electriques enregistreurs a action directe et leurs accessoires)

Standard published on 1.1.1968

Amendment 1 - Direct acting recording electrical measuring instruments and their accessories
(Amendement 1 - Appareils de mesure electriques enregistreurs a action directe et leurs accessoires)

Change published on 1.1.1976