You Do Need power plug adapter while traveling from South Africa to Sint Maarten.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Maarten are A and B and in South Africa are C, M and N. This is how they look like.

South Africa

In South Africa, outlets of type C, M and N are in use.

Type C

Type M

Type N

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B