The four terminals will be numbered 1 - 2 - 3 - 4
Terminals 1 & 2 will be for the Live - brown wires - any way you like
Terminals 3 & 4 for the Neutral - blue wires - any way round
Just try not to put a Brown and a Blue together on the same side.
There should ideally be a picture of the wiring arrangement on the case - use Google - Select Images - enter mains suppressor - look at the pictures.
This advice is offered at your risk
Good luck...
December 2014