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The Ringway Relay Switch for Backup I.S. Power Supplies (RWREL27V4A) enables safe live-line changeover
between one of two possible I.S. power supplies to field equipment in the hazardous area. The relay switch
achieves this by ensuring that the necessary isolation between the two power supplies is maintained at all
times even under fault conditions as required by the Intrinsic Safety concept.
The Relay Switch meets
category 'ia' requirements and is certified for Groups I, IIC and IIIC applications