Do I need to replace it every 3 years to have the warranty protection?

Glen, In order to help you we need to know more information about your application with this product. You can contact us anytime using our chat live https://www.se.com/us/en/work/support/customer-care/contact-schneider-electric.jsp where an agent will be able to give you further assistance on this matter. Warm regards. Schneider Electric Customer Care