AFR-M- Arc Protection Relay

The Arc Protection Relay is mainly used to detect arc faults in electrical systems and protect equipment and personnel in electrical systems from arc faults. Arc protection relays can detect arcs by monitoring parameters such as current, voltage, and electric power, and quickly disconnect the power supply before an electrical fire occurs, thereby reducing the risk of fire.


Arc protection relays are usually used in medium and high voltage power distribution systems, control cabinets, transformers, generators, motors and other electrical equipment. They adopt the dual-criteria principle of arc light detection and overcurrent detection, and have the characteristics of fast protection action and high reliability.

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  • Panel mounting design, rugged Aluminum Housing.
  • Integrate information displayed on large LCD screen.
  • Provide total 4*3-phase current signal input.
  • Single unit max 48pcs opt-sensor connected.
  • Less than 10 ms operation time (from arc flash to relay trip).
  • 16* passive DI point, indicate CB status.
  • 9* trip contacts, free to configuration protect trip logic.
  • 1* Ethernet port support IEC60870-5-103 communication.
  • Independent trip act and alarm act relay.
  • Arc-flash mitigation strategies:


-Light-Sensing Only;

-Light Flash, Supervised by Current;

-Light Flash, Supervised by Pressure(Optional).

  • Optional extra monitor functions by RS-485 connection, user can customize:

-. Bus temperature monitoring (wireless);

-. Partial Discharge sensor (TEV);

-. Smoke sensor.

  • Optional neighboring AFR-M to expand maximum detect quantities of feeder loop.
  • Support OEM and add customized program:

-. For special VCB control and protection logic;

-. Localized language HMI.



  • Reduce the harm of arc light to human body;
  • Reduce damage to equipment caused by arc short-circuit faults;
  • Avoid transformer damage caused by bus failure;
  • Protect the dc system in the station;
  • Ensure the stable operation of power substations;
  • Thermal power plant electrical section switchgear;
  • Wind farm and photovoltaic station switchgear;
  • Large municipal engineering project;



 Power supply

AC/DC85 ~ 265V

-. Consumption

≤ 8W

-. Current input

Current rated : 5A/1A
Measurement range: protection current: 0~20In
Consumption: ≤ 5VA

-. Electrical parameters tolerance

Protection current: ≤ 2%
Protection frequency: 0.1Hz

-. Arc signal input

Channels number: 12-48 channels (optional)
Sensor type: optical fiber
Detect light type: Visible light/UV light (optional)

-. Relay output

Channels number: 9 channels
Operating Voltage: AC250V/8A
Input method: Passive contact
Isolation method: Photoelectric isolation, isolation voltage 2500V

-.Digital input


Channels number: 16 channels
Operating Voltage: 220Vdc
Input method: Wet contact
Isolation method: Photoelectric isolation, isolation voltage 2500V

Notes: Optional passive node (confirm before order)


-. Action time tolerance

Pure arc protection: ≤10ms

Double criterion protection: ≤20ms


-. RS485 communication

Interface: RS485 (one standard, two optional)
Isolation type: photoelectric isolation, lightning protection
Baud rate: 9600bps
Protocol: Modbus

-. Ethernet communication

Interface: 2-Way Ethernet optional
Network parameters: 10M/100M adaptive
Default IP:
Standard: IEC60870-5-103


-. Environment

Working environment: -10 ~ 55°C/ < 93% RH (Non-condensing)
Storage environment: -30 ~ 70°C/ < 70% RH (Non-condensing)
Relative humidity: 5%~ 95%
Atmospheric pressure: 60kPa ~ 106kPa


-. Electromagnetic compatibility

Item Standard
Electrostatic discharge test: IEC 60255-22-2:2008. level-4
Fast transient dry resistance test: IEC 60255-22-4:2008. level-A
1mhz burst interference test: IEC 60255-22-1-2007. level-3
Electrical disturbance test: IEC 60255-22-2:2008.level-3
Surge immunity test: IEC 60255-22-5:2008