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ABB REJ525B 415BAA Fault Relay
ABB REJ525B 415BAA
1. Product Overview
The ABB REJ 525 is a secondary compound overcurrent and earth fault relay. It connects to current transformers of protected equipment to continuously measure phase currents and neutral currents. Upon fault detection, the relay activates, trips circuit breakers, issues alarm signals, and records fault data.
As a product of ABB relay protection series, this device is mainly designed for overcurrent protection and earth fault protection in power systems.
2. Technical Parameters
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Parameter Category
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Specification of REJ525B 415BAA
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Order Model
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REJ525B 415BAA
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Article Number
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1MRS091415-BAA
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I₀ Input Current Rating
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1 A / 5 A
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AC Auxiliary Supply Voltage
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80…265 V ac (Rated: 110/120/220/240 V)
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DC Auxiliary Supply Voltage
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38…265 V dc (Rated: 48/60/110/125/220 V)
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Rated Frequency
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User-selectable 50/60 Hz
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Ambient Temperature Range
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Operation: -10…+55°C; Transportation/Storage: -40…+70°C
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Input Channels
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4 current inputs + 1 external binary input
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Output Contacts
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2 Power Outputs (PO1, PO2), 2 Signal Outputs (SO1, SO2), 1 Internal Fault Monitoring Output (IRF)
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Conductor Size (X1 Current Input)
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0.5…6.0 mm² (single-core) or max. 2.5 mm² (twin-core)
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Conductor Size (X2 Terminal Block)
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0.08…2.5 mm² (single-core) or max. 1.5 mm² (twin-core)
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Reference Operating Time
- Overcurrent Start: Approx. 55 ms for low setting value, approx. 30 ms for high setting value
- Earth Fault Start: Approx. 60 ms for low setting value, approx. 40 ms for high setting value
3. Product Features
3.1 Protection Functions
- Overcurrent Protection: Three-phase low/high setpoint overcurrent protection (supporting definite time or inverse definite minimum time (IDMT) characteristics)
- Earth Fault Protection: Non-directional earth fault protection (supporting definite time or IDMT characteristics)
- Phase Failure Protection: Phase discontinuity unit
- Circuit Breaker Failure Protection (CBFP): Independent circuit breaker failure protection unit
- Inrush Current Identification Upon Closing: Automatically doubles setting values during startup
3.2 Recording and Data Storage
- Built-in disturbance recorder with a maximum recording duration of 10 seconds
- Supports recording of 4 analog channels and up to 8 digital channels
- Non-volatile storage: Event codes, configuration values, the latest five timestamped event data (up to 60 events in total)
3.3 Human-Machine Interface (HMI)
- Equipped with a 2×16 character LCD display
- Six control buttons for device operation
- Multi-language interface supported: English, German, French, Spanish, Italian, Swedish, Finnish
- Built-in user password protection function
3.4 Communication Capability
- Compatible with SPA bus and IEC 60870-5-103 protocol
- Front-panel optical PC connector for configuration tool connection
- Rear-panel RS-485 connector for system communication and optical fiber expansion
- Supports optical bus expansion (matched with RER 103 module)
3.5 Self-diagnosis and Maintenance Functions
- Real-time monitoring of electronic hardware and software operation status
- Automatic locking of all outputs in case of permanent faults
- Adopts isolated DC/DC converter for power supply
- All parameter settings editable via computer
- Alarm notification via HMI indicator LEDs and text messages
4. Structure and Composition
4.1 Hardware Structure
- Enclosure: Silver-gray metal compact enclosure, applicable to industrial automation scenarios
- Front Panel: Printed with ABB brand logo, product name and model number
- Status Indicators: Three LED indicators (READY, START, TRIP)
- LCD Screen: Displays device operating status and parameter data
- Control Panel: Equipped with cross directional keys and C/E function keys
- Power Port: Double-hole power interface on the left side
4.2 Wiring Terminal Definition
X1 Series (Current Input Terminals)
- Zero-sequence current (I₀): X1.1/1-3
- Phase current (In=5A): X1.1/4-5, 7-8, 10-11
X2 Series (Multifunctional Terminals)
- Auxiliary power voltage: X2.1/1-2 (DC/AC universal)
- Binary input: X2.1/17-18
- Communication port: Rear-panel RS-485 connector (D9S)
- Power/signal output and self-monitoring contacts: Connected to corresponding sockets on X2 terminal block
4.3 Optional Mounting Accessories
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Accessory Type
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Part Number
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|---|---|
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Rear Terminal Protection Cover
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1MRS060132
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Flush Mounting Kit
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1MRS050209
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Semi-flush Mounting Kit
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1MRS050253
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Wall Mounting Kit
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1MRS050240
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Side-by-side Mounting Kit
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1MRS050241
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19-inch Rack Mounting Kit
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1MRS050257
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Optical Bus Module RER 103
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1MRS090701
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Optical Coupling Cable
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1MKC950001-1/2
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5. Application Fields
As a secondary protection relay applied in relay protection systems, REJ525B has the following core applications:
- Application Scenario: Continuous overcurrent and earth fault monitoring on phase currents and neutral currents of electrical equipment
- System Matching: Compatible with substation automation and monitoring systems to complete circuit tripping, alarm triggering and fault data archiving tasks
- System Expansion: Flexible routing of cascaded protection signals via output contact matrix to realize scalable system layout
- Typical Application: Used as backup protection relay for medium-voltage distribution systems and substation protection solutions
6. Installation and Maintenance
6.1 Mounting Methods
Multiple mounting options are available, users can select matched mounting kits according to on-site environment:
- Flush Mounting: Suitable for standard cabinet installation
- Semi-flush Mounting: Partial protruding installation mode
- Wall Mounting: Fixed installation on wall surfaces
- Side-by-side Mounting: Parallel installation of multiple devices
- 19-inch Rack Mounting: Standard industrial rack installation
6.2 Wiring Requirements
- All current loops shall pass through test terminals to ensure stable contact performance
- Strong-current terminals and weak-current terminals shall be arranged separately; empty terminals or reinforced insulating partitions shall be adopted for isolation if separate arrangement is unavailable
- The primary side of power supply is protected by a 3.15A slow-blow fuse on the PCB board
6.3 Maintenance Guidelines
- Daily Monitoring: The built-in self-supervision system triggers alarms via HMI LEDs and text messages once faults occur during operation
- Power Inspection: Check fuse status regularly to ensure normal operation
- Parameter Backup: Back up all configuration parameters via computer periodically
- Communication Test: Test communication stability of optical port and RS-485 port regularly
- Standard Maintenance: Perform all maintenance operations in accordance with official product manuals
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