Question

in switches an insulating materials seperate the metal terminals from each other

Answer 1

Hola amigo!!
Rajdeep here!!

Your question is absolutely correct-----
In switches, an insulating material, specially plastic covering, is used to separate the metal terminals from each other.

Otherwise what would have happened?
If the two terminals somehow come in contact with each other, the current will get a zero resistance path to flow. Hence, it will result in a short circuit. In case a fuse or an MCB is not attached to the circuit, heavy current will keep on flowing and when you touch it, you get a fatal shock.

Common sense-
If the switch was not covered with an insulting material, then if you just touch it to switch on or switch off an appliance, you will come in contact with the live wire, thereby getting a fatal shock.

Thanks!!

Answer 2

in switch an insulating material srperate the metal terminal is plastic covering