The ABB REL561 is a line protection terminal used in medium-voltage and high-voltage electrical power systems to protect against faults on overhead lines and underground cables. It can be used for a variety of applications, including:

• ·Feeder protection
• ·Transformer protection
• ·Motor protection
• ·Generator protection

The REL561 is a microprocessor-based relay that provides a wide range of protection functions, including:

• ·Overcurrent protection
• ·Earth fault protection
• ·Undercurrent protection
• ·Loss of voltage protection
• ·Thermal overload protection

The REL561 is also equipped with a number of communication features, which allow it to be integrated into a variety of protection schemes. These features include:

• ·Serial communication
• ·Ethernet communication
• ·IEC 61850 communication

The REL561 is a reliable and versatile protection relay that can be used in a wide variety of applications.

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