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Home > Grid Automation > Protection Relays > Auxiliary Relays > HMA Hinged Armature Auxiliary Relay
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HMA Hinged Armature Auxiliary Relay

HMA Hinged Armature Auxiliary Relay
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The Type HMA relay is an instantaneous auxiliary device whose contacts are opened and closed by the movement of a hinged armature.

Type HMA Century Series auxiliary relays are designed to provide additional contacts, higher contact carrying and interrupting ratings, timing, interlocking, electrical separation and other auxiliary functions.
The Century Series coil design provides longer operating life than previous designs as a result of changes in the entire coil insulation system.

Features and Benefits
  • Front or back connected
  • Molded Textolite case
  • Applications
  • Contact multiplication
  • Protection and Control
  • High speed pickup
  • Self-resetting