What is the meaning of Insulated?

Protected from heat, cold, noise etc, by being surrounded with an insulating material.

Placed or set apart.

Isolated or separated from other conducting materials, or sources of electricity.

Situated at so great a distance as to be beyond the effect of gravitation; said of stars supposed to be so far apart that the effect of their mutual attraction is undetectable.

simple past and past participle of insulate

Source: wiktionary.org