Industrial 57491 ES281CMB Power Supply Module

Industrial 57491 ES281CMB Power Supply Module from Lorain Reliance Electric is a 275-watt PLC power supply (OEM part ES281CMB, Emerson/Reliance lineage) used in automation systems. It accepts 120/240 VAC input at 50/60 Hz and lists a current rating of 5/2.5 A, aligning with its high-current backplane power responsibilities for Reliance/Lorain controllers. The 57491/ES281CMB designation identifies this Lorain Reliance module, and it is documented as discontinued by the manufacturer, which can affect sourcing and compatibility considerations. With its 275 W rating and universal mains input, it serves legacy industrial control applications that require a robust, high‑reliability supply for backplane electronics in Lorain/Reliance Automax-style systems.