CR, CRC, CRP, CRD Directional Overcurrent Relays Instruction Leaflet

This instruction leaflet covers the application, construction, operation, and characteristics of ABB’s CR, CRC, CRP, and CRD directional overcurrent relays, which are used for phase or ground fault detection and isolation in power systems. It details the relay components, including directional units, overcurrent units, and indicating contactor switches, along with trip circuit constants and time-current characteristics.