Check the labor market access notice on your residence permit before starting. If it says "limited labor market", Student at Work specifies a limit of twenty hours per week during the school year and the possibility of working without this limit during school holidays. Have the rules adapted to your situation confirmed.
The quota of 650 hours per calendar year with reduced social security contributions is a different rule : it does not replace the limits linked to the stay. Consult your quota, sign the appropriate contract and also check the tax consequences or the benefits you receive. The UCLouvain jobs team offers resources for research.
