There is a -12V,a +12V,a 5V,a 3.3V terminal.Each output take a 5A fuse. Overcurrent ,fuse can be replaced by yourself.Each power rail has a corresponding ground connection; all of the power rails are brought out to a binding post.About the 24pin port:The 24pin port powers the computer motherboard in the host computer. Usually, this port is used together.Model:XH - M229Compatible with the port: ATX (compatible with partial BTX type)The PIN number: 24 pinNumber of sets of output: Four sets of different voltage