what is mean by dry contact and volt free contact in electrical circuit?

what is mean by dry contact and volt free contact in electrical circuit

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  • what is a electric dry contact volt mean free Electrical electric contact circuit
  • what is a electric dry contact volt mean free Electrical electric contact circuit
  • what is a electric dry contact volt mean free Electrical electric contact circuit
  • what is a electric dry contact volt mean free Electrical electric contact circuit
  • what is a electric dry contact volt mean free Electrical electric contact circuit
  • what is a electric dry contact volt mean free Electrical electric contact circuit
  • what is a electric dry contact volt mean free Electrical electric contact circuit
  • what is a electric dry contact volt mean free Electrical electric contact circuit