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Arcteq AQ-F255 – Feeder and Line Protection Relay

The Arcteq AQ-F255 is a modular feeder and line protection relay with high-pass I/O. It supports line differential protection (ANSI 87L), a full suite of feeder protection functions, IEC 61850 communications, low-voltage relay protection (LVRT), and IEC 62443-4-2 SL1 cybersecurity. Six design variants (A, B, C, R, S, V) are suitable for substations, industrial lines, and renewable energy applications.
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The Arcteq AQ-F255 protection relay is a modular protection and control platform for feeder and line applications that require high I/O density, flexible communications and detailed measurements. Up to 11 I/O or communication modules can be added to match the required number of signals, interfaces and control functions.    
  Download: Arcteq AQ-F255 Instruction Manual (PDF, 25 MB) ↗

Key points

  • Residual current line protection (ANSI 87L) — the transformer can be located in the protection zone.
  • Full feeder protection (current and voltage functions).
  • Power and energy measurement with a resolution of up to 0.2%.
  • LVRT for network compliance.
  • Cybersecurity: IEC 62443-4-2 SL1.
  • Large I/O capacity; modular hardware with arc-protection options, RTD inputs, and flexible expansion.

Options AQ-F255

  • AQ-F255A — complete feeder protection.
  • AQ-F255B — line differential protection.
  • AQ-F255C — line differential + full feeder protection in one device.
  • AQ-F255R — feeder protection with phase-selective tripping.
  • AQ-F255S — feeder protection with synchroniser functionality.
  • AQ-F255V — feeder protection with AVR and transformer module.

Communications and standards

  • IEC 61850 , Modbus, DNP3 , SPA, IEC 60870-5-101/103/104 .

Typical application

Medium voltage feeders, overhead lines and cables, industrial substations, CHP/renewable energy connections.

The Arcteq AQ-F255 protection relay is a modular protection and control platform for feeder and line applications that require high I/O density, flexible communications and detailed measurements. Up to 11 I/O or communication modules can be added to match the required number of signals, interfaces and control functions.    
  Download: Arcteq AQ-F255 Instruction Manual (PDF, 25 MB) ↗

Key points

  • Residual current line protection (ANSI 87L) — the transformer can be located in the protection zone.
  • Full feeder protection (current and voltage functions).
  • Power and energy measurement with a resolution of up to 0.2%.
  • LVRT for network compliance.
  • Cybersecurity: IEC 62443-4-2 SL1.
  • Large I/O capacity; modular hardware with arc-protection options, RTD inputs, and flexible expansion.

Options AQ-F255

  • AQ-F255A — complete feeder protection.
  • AQ-F255B — line differential protection.
  • AQ-F255C — line differential + full feeder protection in one device.
  • AQ-F255R — feeder protection with phase-selective tripping.
  • AQ-F255S — feeder protection with synchroniser functionality.
  • AQ-F255V — feeder protection with AVR and transformer module.

Communications and standards

  • IEC 61850 , Modbus, DNP3 , SPA, IEC 60870-5-101/103/104 .

Typical application

Medium voltage feeders, overhead lines and cables, industrial substations, CHP/renewable energy connections.

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