You Do Need power plug adapter while traveling from Switzerland to Mauritius.

Here is Why You Need An Adapter

The outlet and plug type used in Mauritius are C and G and in Switzerland are C and J. This is how they look like.

Switzerland

In Switzerland, outlets of type C and J are in use.

Type C

Type J

Mauritius

In Mauritius, outlets of type C and G are in use.

Type C

Type G