isolator

/ˈaɪsəˌleɪtər/
noun
  1. A device or material that prevents the transfer of electricity, heat, sound, or vibration.
    • An electrical isolator is used to safely disconnect circuits during maintenance.
    • The soundproof room used foam isolators to block outside noise.
    • The technician installed a rubber isolator to reduce the machine's vibration.
  2. A person or thing that separates or keeps something apart from others.
    • The new software acts as an isolator, separating sensitive data from the main network.
    • The guard acted as an isolator, keeping the protesters away from the building.
    • In the lab, the chemical isolator prevented contamination between samples.