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Home > Grid Automation > Protection Relays > Line Protection > P841 - Legacy

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  Legacy Transmission Protection

MiCOM Agile P841 - Legacy
Line Terminal Protection Systems

The P841 is under last-time buy. Orders may be placed until 15th June 2025 and will be fulfilled based upon availability. As an alternative, please refer to P84.

The MiCOM Agile P841 is a multifunctional line terminal IED for control and back-up protection in transmission and sub-transmission feeder bays. The P841 provides management of single or dual breaker autoreclose logic schemes with synchrocheck.

Key features:

  • Extremely versatile, e.g. managing leader-follower reclosing schemes in the event of dual breaker application
  • Transmission-class circuit breaker failure protection
  • Operator control and plant status indication facilities - 10 fully programmable function keys and tri-color LEDs


  • P841A Line Terminal Management IED
  • P841B Used for line terminals supplied by two circuit breakers, such as mesh/ring bus, double-bus, and breaker and a half feeding

What's New

Enhanced Ethernet board module with switchable Ethernet redundancy delivered in a single model.

The new board module is supported on P841 SW 76, 79 and 86.

It supports PRP, HSR and RSTP in one model, allowing a single P40 model to be used in any application requiring redundant Ethernet communications. The new module is designed to handle high density traffic in the IEC 61850-8-1 network, with time latency halved. Larger architecture digital substations can also be supported, with up to 50 nodes now possible in HSR rings.

Key Features & Benefits:

  • Universal IRIG-B – Modulated and demodulated supported in the same model
  • HSR Ring – Extended to 50 node support for larger substation architectures
  • Fast performance, particularly in onerous applications such as where process bus GOOSE is used for tripping purposes