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Semiconductor fuses in a drive are provided to

  • A.prevent a failed device from destroying the assembly
  • B.protect the devices from a short circuit on the output
  • C.limit the inrush current when the drive is first energised
  • D.provide the overload protection of the driven machine

Answer: A

A device that has already failed short must be isolated before the link capacitor empties into it and ruptures the module, so the fuse protects the surroundings rather than the device. Electronic detection protects the healthy devices.

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