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This 240W aftermarket switching PSU is engineered to substitute original D240EM-00, HU240AS-00 and AC240NM-00 factory power supplies, perfectly fitting Dell Optiplex 3040,3046,3050,5040,7040,3250 and Inspiron 3650,3653,3655,3660,3668 mid-tower desktops. Same physical dimension and stock cable harness enable direct swap of faulty original power unit with no extra adapters or case cutting required. Adopted premium internal components and temperature-controlled fan design to balance heat dissipation and low running noise for regular office environment. Comprehensive built-in safety protections effectively isolate desktop hardware risks from unstable grid fluctuation, an economical repair solution for defective Dell MT system power source.