DIN EN 1627 describes the requirements on the properties of burglar-resistant windows, window doors and their classification. These are classified in different security classes. Windows in security class 1 provide basic protection against physical attacks such as kicking, flying kick, shoulder charge, lifting upwards and tearing out. However, they only offer limited protection against the use of lever tools. Windows in security class 2 make life difficult for opportunist burglars who use simple tools like screwdrivers, pliers and wedges. They offer an average level of burglar resistance. A window in security class 3 provides a high level of burglar resistance. It stands up to a burglar trying to gain access using a second screwdriver and a crow bar.
How effectively a front door protects against attempted break-ins is defined by the security class (WK), which is regulated by European standards. Schüco offers security components for security classes WK 1 to WK 3.