REX 521 | ABB Feeder Protection Relay REX521 Genius I/O Adapter Board Rated Isolation: 50V

Rated Isolation: 50V

5 Hz (270 cpm)

-10 to +10 VDC

Battery back-up

Input Channels: 8 analog inputs

REX 521 | ABB Feeder Protection Relay REX521 Genius I/O Adapter Board Rated Isolation: 50VOverview Model: REX 521 Application: Feeder protection, control, and supervision Key Applications Network Protection: Incoming outgoing feeders, substation, and motor feeders Additional Use: Backup protection for transformers and high voltage line relays Voltage Systems: Suitable for radial isolated neutral, resonant earthed, solidly earthed, and resistively earthed systems Features Inputs: Energizing inputs for current and voltage transformers;