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This instruction manual provides installation, operation, maintenance, and testing information for the BE1-50/51B-214, -215, -223, and -225 Overcurrent Relays. It covers relay specifications, controls and indicators, functional operation, installation requirements, and testing procedures.

This instruction manual provides installation, operation, application, and testing information for the BE1-50/51B-122 Overcurrent Relay. It covers retrofit applications for ABB CO relays, time-overcurrent and instantaneous protection functions, extended instantaneous time delay operation, and replicated ABB CO and IEC time-current characteristics.

This instruction manual provides installation, operation, maintenance, and testing information for the BE1-50/51B-121 and BE1-50/51B-123 Overcurrent Relays. It covers relay specifications, controls and indicators, ABB CO and IEC time characteristic curves, extended instantaneous element time delay settings, installation requirements, and testing procedures.

This instruction manual provides installation, operation, maintenance, and testing information for the BE1-50/51B Overcurrent Relay. It covers relay specifications, controls and indicators, functional operation, installation requirements, and testing procedures.

This instruction manual provides installation, operation, maintenance, and testing information for the BE1-50/51M Overcurrent Relay. It covers relay specifications, controls and indicators, functional operation, installation requirements, and testing procedures.

This application note explains how to select the appropriate BE1-50/51B model and settings when replacing legacy IAC and CO electromechanical overcurrent relays. It provides guidance on matching time-current characteristics, reset characteristics, and instantaneous overcurrent settings for successful retrofit applications.

This application note examines the replacement of legacy electromechanical overcurrent relays with modern BE1-50/51B retrofit relays. It highlights how plug-and-play retrofit solutions can extend switchgear life, reduce maintenance requirements, and improve protection system reliability.

This instruction manual provides installation, operation, configuration, and maintenance information for the BE1-25A Auto Synchronizer. It covers automatic synchronizing functions, controls and indicators, specifications, installation requirements, and routine maintenance procedures.