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This 240W replacement switching PSU is engineered to replace original D240EM-00, HU240AS-00 and AC240NM-00 power units, compatible with full series Dell Optiplex 3040,3046,3050,5040,7040,3250 and Inspiron 3650,3653,3655,3660,3668 mini tower desktops. Same physical dimension and factory-spec cable harness enable seamless drop-in installation to swap faulty original power supply directly. Built with high-quality internal components and smart thermostatic fan design, it delivers steady power output under regular office ambient temperature and reduces operational noise effectively. Multi-layer built-in safeguard circuits effectively shield desktop hardware against unstable grid voltage, surge current and accidental short circuit, an affordable maintenance option for broken Dell MT system power source.