The 2866721 is a DIN-rail mount primary-switched Power Supply with SFB technology. Compact power supply unit of the new QUINT POWER generation maximize the availability of your system. Even the standard power circuit-breaker can be tripped reliably and quickly with the SFB technology (selective fuse breaking technology) and six times the nominal current for 12ms. Defective current paths are disconnected selectively, the defect is limited and the important system parts remain in operation. A comprehensive diagnostics is carried out by continuously monitoring the output voltage and current. This preventive function monitoring visualizes the critical operating modes and reports them to the control unit before an error occurs.