ABB REX521BBHGLB01C Multifunction Feeder Protection Relay

CT secondary rated: 1 A / 5 A configurable

System frequency: 50 Hz / 60 Hz

Auxiliary supply: 80‑250 V DC / 85‑265 V AC wide‑range power

Total power consumption: ≤25 W

Local HMI: Graphic LCD display, LED status indicators and operation push‑buttons

Communication interfaces: RS485 serial port, LON bus interface

Fault recording: COMTRADE disturbance waveform storage, sequential‑of‑event event log

Mounting mode: 19‑inch standard rack‑mount unit

Operating temperature: −25 ℃ ~ +55 ℃

Storage temperature: −40 ℃ ~ +85 ℃

Humidity: 5‑95 %RH non‑condensing

EMC compliance: IEC 60255‑22‑1 /‑22‑2 /‑22‑3

Certifications: CE, UL, IEC 60255 approval

Non‑directional / directional phase overcurrent multi‑stage protection, earth‑fault protection, sensitive earth‑fault protection, thermal overload protection, phase unbalance and phase‑sequence supervision.

Motor‑oriented protection includes start‑up supervision, locked‑rotor monitoring and anti‑frequent‑start inhibition.

Breaker‑failure protection, configurable auto‑reclosing function.

Realize local & remote circuit‑breaker control, bay‑level interlock logic and trip‑circuit supervision.

True‑RMS high‑accuracy measurement for current, voltage, active/reactive power, energy and frequency.

Event sequence logging, COMTRADE fault disturbance recording and multiple setting‑group management.

User‑configurable programmable logic for custom interlock and alarm functions.

Continuous hardware self‑diagnosis detects internal faults and outputs alarm signals to local HMI and upper‑level station control system.

Configuration and commissioning are completed via CAP501 / CAP505 engineering softwareeero.

Installed in 19‑inch standard rack inside substation protection cabinet. Strictly follow CT/VT polarity for secondary wiring, avoid CT secondary open‑circuit hazard. Auxiliary power supply shall be kept within rated voltage range. After unit replacement, download complete project configuration file. Perform protection‑logic verification test, breaker trip‑close loop test, binary input/output point‑to‑point signal test and communication validation with SCADA system. Confirm no hardware self‑diagnosis fault alarms.

Medium‑voltage incoming‑feeder, outgoing‑feeder protection for power plants, industrial plants and utility distribution substations. Also suitable for medium‑voltage motor protection, can act as backup protection for transformer baysABB Group.