ABB REU523 Overvoltage and Undervoltage Relay
ABB REU523 Overvoltage and Undervoltage Relay Supplier and Exporter in India
ABB REU523 Legacy Voltage Protection Relay – Price and Availability
ABB REU523 is a combined overvoltage and undervoltage protection relay used for feeders, busbars and electrical equipment requiring voltage supervision.
For ABB REU523 price and availability, send the complete part number, relay nameplate, quantity and destination country.
Description
ARP IMPEX supplies and exports ABB REU523 overvoltage and undervoltage relays for existing substations, medium-voltage switchgear and industrial power-distribution systems.
REU523 monitors the phase-to-phase voltage of the protected circuit and operates when the voltage moves outside the selected limits. It combines both overvoltage and undervoltage protection in one relay, making it useful for feeder and busbar voltage supervision as well as protection of generators, motors and transformers.
The relay can be used for single-phase or three-phase voltage monitoring. It provides separate low and high stages for overvoltage and undervoltage conditions, together with circuit-breaker failure protection and fault recording.
REU523 was part of ABB’s older numerical protection relay range and is now mainly relevant where an existing panel already uses this model or where an exact legacy spare is required.
If you are looking for an ABB REU523 replacement relay, old stock or matching spare, send the complete order code and a clear photograph of the relay nameplate for checking.
Technical Specifications
- Brand: ABB
- Model: REU523
- Product type: Combined overvoltage and undervoltage relay
- Product status: Not active since 2011
- Voltage measurement: Phase-to-phase voltage
- Operation: Single-phase or three-phase
- Overvoltage protection: Low-set and high-set stages
- Undervoltage protection: Low-set and high-set stages
- Positive-phase-sequence protection: Available
- Nominal voltage selection: 100 / 110 / 115 / 120 V
- Rated frequency: 50 / 60 Hz selectable
- Circuit-breaker failure protection: Included
- Disturbance recorder: Included
- Local interface: Alphanumeric LCD
- Communication: Front optical connection and rear serial communication
- Protocols: SPA bus and IEC 60870-5-103
The full REU523 order code should be checked before supply because it identifies the relay hardware and revision.
Features
- Combined overvoltage and undervoltage protection
- Single-phase or three-phase voltage monitoring
- Separate high and low voltage stages
- Positive-phase-sequence voltage protection
- Circuit-breaker failure protection
- Two setting groups
- Fault and disturbance recording
- Local LCD for settings and indications
- Front optical communication
- Rear communication for substation systems
- Configurable trip and signalling outputs
- Continuous internal self-supervision
REU523 gives voltage protection and monitoring in a relatively compact relay, which is useful for older switchgear panels where separate overvoltage and undervoltage devices would otherwise have been required.
Applications
ABB REU523 can be used for:
- Medium-voltage feeder voltage protection
- Busbar overvoltage protection
- Busbar undervoltage protection
- Industrial power-distribution systems
- Utility substations
- Generator voltage protection
- Motor overvoltage and undervoltage protection
- Transformer voltage supervision
- Medium-voltage switchgear panels
- Feeder voltage monitoring
- Power-system voltage supervision
- Existing ABB protection panels
ABB specifically documents REU523 for voltage protection and supervision in distribution substations, along with generator, motor and transformer applications.
ABB REU513 and REU523 Voltage Relays
Within ABB’s older multipurpose numerical protection relay range, the voltage relay models were:
- ABB REU513 – Combined overvoltage and undervoltage relay
- ABB REU523 – Combined overvoltage and undervoltage relay
The same ABB range also included REJ511/521 earth-fault relays, REJ513/523 overcurrent relays, REJ515/525 combined overcurrent and earth-fault relays, and REJ517/527 directional earth-fault relays.
REU523 provides the same main voltage-protection role as REU513 but belongs to the later 52_ series and includes rear communication for connection to a substation automation system.
ABB REU523 Legacy Spare Enquiries
For an existing installation, ARP IMPEX can assist with:
- ABB REU523 price and availability
- REU523B 409BAA enquiries
- Legacy spare requirements
- Existing relay identification
- Part-number checking
- Replacement enquiries
- Single-piece requirements
- Multiple-quantity quotations
- ABB technical documentation
- Export packing
- International shipment
For quotation, please send:
- Complete ABB REU523 part/order number
- Clear nameplate photograph
- Quantity
- Destination country
- Required delivery date
Why Buy ABB REU523 from ARP IMPEX?
ARP IMPEX supplies ABB protection relays for power utilities, industrial companies, EPC contractors, panel builders, maintenance companies and electrical traders.
We can assist with ABB REU523 legacy spare availability, part-code checking, price and international export requirements.
Request a Quote for ABB REU523
Looking for an ABB REU523 voltage protection relay supplier in India?
Send the complete relay code, nameplate photograph, quantity and destination country.
Contact ARP IMPEX for ABB REU523 price, availability, legacy spare requirements and export quotation.
