Voltcraft fixed voltage switch mode power supply bench voltcraft fsp 4805 the voltcraft fsp 4805 is a 285w fixed voltage switch mode power supply suitable for use in laboratories workshops and industry the fsp 4805 is highly efficient and produces 48 to 56v dc and 5a with a current limiter the output voltage can be adjusted via the potentiometer on the psus underside its steel plate enclosure makes the fsp 4805 suitable for use even in demanding industrial conditions voltcraft fsp 4805