MiCOM P521 relay provides fast, efficient current differential protection. It is very flexible and can be applied to a wide range of power systems. Offering a variety of communications interface options, MiCOM P521 provides valuable local and remote back-up protection.

Multiple interface options and tripping for wide range of power systems
Ensuring optimum phase selection, MiCOM P521’s many integrated protection functions allow for application to a wide range of power systems. It offers both local and remote back-up protection. MiCOM P521 also provides fast tripping results for an internal fault, and stability for any out-of-zone fault.

Its many interface options support metallic, direct fiber optic and multiplexed digital links. Tripping uses a proven characteristic comparing differential current with through current, enabling easier testing. MiCOM P521 includes a full range of integrated back-up protection, thereby enhancing reliability.

Highly selective unit protection and value added back-up protection
MiCOM P521 offers highly selective unit protection and a variety of end-to-end communications interface options. Its numerous integrated back-up elements can run as hot standby in the event of a communications channel outage.

Standard Manufacturers Warranty: 2 years

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