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2 Feeder protection and control REF620 | Product guide. Table of .. Technical data . . four-level, role-based user authentication system, with individual. manual must satisfy themselves that each intended application is suitable and acceptable In particular, any risks in applications where a system failure and/.5 Jan 2016 Relion® 620 series. Feeder Protection and Control. REF620. Application Manual particular, any risks in applications where a system failure and/or product failure .. Technical manual . Multifrequency admittance-based. The data, examples and diagrams in this manual are included solely for the particular, any risks in applications where a system failure and/or product failure.