ABB REX521 REX521GHHPSH04G Feeder Protection Relay

Company Information
E-mail		[email protected]
Mobile		+8613666033393
Whatsapp		+8613666033393
WeChat		13666033393
Add		Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China

Product Overview

The ABB REX521 REX521GHHPSH04G is a comprehensive feeder protection relay engineered for medium-voltage power distribution systems. Designed for both directional and non-directional protection applications, it integrates multiple protection, control, measurement, and supervision functionalities into a single unit. It is suitable for a wide range of power systems including radial, isolated, and grounded networks.

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Technical Specifications

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Applications

The REX521 relay is designed for the protection of feeders in single busbar systems using one circuit-breaker. It supports various configurations including:

• Short-circuit and time overcurrent protection

• Directional and non-directional earth fault protection

• Thermal overload protection

• Voltage and frequency-based protection

• Circuit-breaker failure protection and auto-reclosing

It is suitable for:

• Radial isolated neutral networks

• Solidly earthed systems

• Resistive or resonant earthed systems

• Medium-voltage motor drives and transformers

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Advantages

• Comprehensive Protection: Combines current, voltage, frequency, and thermal protection in one device.

• Flexible Configuration: Supports multiple standard configurations (H01–H08, B01–B02, M01–M02).

• Communication Ready: Equipped with multiple protocol support for integration into SCADA and automation systems.

• Advanced Diagnostics: Includes circuit-breaker wear monitoring, transient recorder, and trip circuit supervision.

• User-Friendly: Easy configuration via CAP tools and front panel HMI.

• Compact Design: Saves panel space with rack-mountable structure.

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FAQ

1. What types of faults does the REX521 protect against?
The REX521 protects against overcurrent, earth faults (directional/non-directional), thermal overloads, voltage anomalies, and circuit-breaker failures.

2. Can this relay support automatic reclosing?
Yes, configurations like B02, M02, H01–H08 support 1 to 5 automatic reclosing shots.

3. What communication protocols are supported?
SPA, IEC 103, Modbus, DNP 3.0, and LON (in specific versions).

4. What is the operating temperature range?
The unit operates between -10°C and +55°C and can be stored between -40°C and +70°C.

5. Is the relay suitable for motor protection?
Yes, especially in configuration H07 which includes motor-specific protections.

6. What voltage and current inputs does it support?
Voltage: 100–120 V; Current: 0.2 A / 1 A / 5 A.

7. How is the relay configured?
Configuration is done using ABB’s CAP501 or CAP505 tools.

8. Does it support remote control and monitoring?
Yes, through rear and front communication ports and integration into automation systems.

9. What are the enclosure protection ratings?
IP54 for the front side and IP20 for the rear side.

10. How many digital inputs and outputs are available?
It features 9 digital inputs, 3 power outputs, 2 signal outputs, and 1 IRF output.

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FAQ

1. What types of faults does the REX521 protect against?
The REX521 protects against overcurrent, earth faults (directional/non-directional), thermal overloads, voltage anomalies, and circuit-breaker failures.

2. Can this relay support automatic reclosing?
Yes, configurations like B02, M02, H01–H08 support 1 to 5 automatic reclosing shots.

3. What communication protocols are supported?
SPA, IEC 103, Modbus, DNP 3.0, and LON (in specific versions).

4. What is the operating temperature range?
The unit operates between -10°C and +55°C and can be stored between -40°C and +70°C.

5. Is the relay suitable for motor protection?
Yes, especially in configuration H07 which includes motor-specific protections.

6. What voltage and current inputs does it support?
Voltage: 100–120 V; Current: 0.2 A / 1 A / 5 A.

7. How is the relay configured?
Configuration is done using ABB’s CAP501 or CAP505 tools.

8. Does it support remote control and monitoring?
Yes, through rear and front communication ports and integration into automation systems.

9. What are the enclosure protection ratings?
IP54 for the front side and IP20 for the rear side.

10. How many digital inputs and outputs are available?
It features 9 digital inputs, 3 power outputs, 2 signal outputs, and 1 IRF output.

Related REX521 / Similar ABB Models

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Popular ABB Relay Models

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