HU, HU-1, HU-4 transformer differential relays

The types HU, HU-1, HU-4 relays are high speed relays used in the differential protection of transformers. These relays can be applied where the magnetizing inrush current to the transformer is severe.

 Why ABB?

  • Long production life, ease of application and reliable protection
  • High quality design
  • 12 year warranty
  • Short lead times
  • Consistent on-time delivery
  • 24/7 customer support

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