The ZKDN series of security floating-operation power supplies are devices designed for security systems requiring a guaranteed 12 V or 24 V power supply. Their primary function is to ensure the continuous operation of alarm, access control and monitoring systems, even in the event of a mains power failure. These units are characterised by high reliability and operational stability, making them suitable for use in facilities with heightened security requirements. They are equipped with buffer circuits that automatically switch the power supply to a backup source in the event of a mains failure. The design also includes protection against overloads and short circuits, which further safeguards the entire installation. ZKDN floating-operation power supplies are characterised by their ease of installation and operation, as well as their compatibility with a wide range of peripheral devices. This solution is ideal for installers and users seeking a stable and proven power source that guarantees the safe operation of security systems in various types of premises.