REX 521 | ABB Feeder Protection Relay REX521 Genius I/O Adapter Board Input Modules Supported: Two T9401/2

Input Modules Supported: Two T9401/2

and motor feeders

Input Channels: 8 analog inputs

Supports 2 GE Fanuc I/O modules per block

Battery back-up

REX 521 | ABB Feeder Protection Relay REX521 Genius I/O Adapter Board Input Modules Supported: Two T9401/2Overview 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;