IPX800 - Must we protected the drived circuits ?

Yes, the IPX800 should not absolutely act like a fuse or a circuit breaker. The circuits which you will cable on outputs of your IPX800 must absolutely be protected by measures protection as envisaged in standard NF C15-100 in France for example (fuse, magnetothermal circuit breaker, differential). You must make sure of the conformity of your electrical circuits as if the IPX800 were not present: its outputs do nothing but act like a switch or a pushbutton in your already existing circuits.
It is appropriate thus that you control the bases of domestic electricity to use the IPX800 and to cable power circuits there on the outputs relays : you must be informed a minimum of.