Direct replacement for Dell OEM models AC255ES-01, L255ES-00/01, F255ES-00, D255AS-00, H255ES-00/01.; Perfect compatibility with OptiPlex 3020, 7020, 9020 SFF & Precision T1700 small form factor systems.; Standard 8+4 Pin connector layout for direct plug-and-play installation, no adapters needed.; Stable 255W output with auto-ranging 100-240V AC input for worldwide use.; Industrial-grade circuitry with OVP, OCP, SCP protections & full-load tested for reliability.