Power entry a the bottom: 3 terminals marked with "L", "N", and Eerth ground.
Fuse at the center: 2 terminals
Switch at the top: 4 terminals of an DPST switch. One pole left, one pole right.
Insert a fuse (based on the current rating) solder the output wire (1 line wire , 1 neutral wire , 1 earth ground wire) earth wire probably attached to chassis.
Keep in mind that line terminal will go to fuse then switch and neutral terminal directly go to switch (you can use switch outputs line and neutral for your application)
Please take a multi meter and conform if you have further doupt