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Electrical relays. Vibration, shock, bump and seismic tests on measuring relays and protection equipment - Vibration tests (sinusoidal) Ingestion-build-180956 Annex C (informative) Types andWhat is BS EN 60255 21 1 Electrical relays about? BS EN 60255 21 1 is part of a series specifying the vibration, shock, bump and seismic requirements applicable to measuring relays and protection equipment (with or without contacts). BS EN 60255 21 1 includes two types of vibration tests: the vibration response test and the vibration endurance test, and is generally based upon IEC 68 2 6. The requirements of BS EN 60255 21 1 are applicable only to