DC overcurrent relay
  • A relay which is actuated when the current in a DC circuit exceeds a specified value. Used, for instance, to protect mass-transit system components such as third rails and trolley wires. DC permanent magnet motor A permanent magnet motor controlled by DC control signals. The speed-torque curve of this type of motor is essentially linear. Such motors may or may not be brushless.
  • synonym direct-current overcurrent relay

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