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Elmdene STX2405-C 24V DC 5A Power Supply Unit. The new STX range of switch mode power supplies has been specifically designed for EN54 compliant fire systems. Available in either 1A, 2A, 5A or 10A versions they are certified to EN54-4:1997, A1:2002 and A2:2006. The units include intelligent battery charging using Elmdene's efficient EcoCharge technology, possess mains and battery monitoring with independent volt-free outputs and also feature battery deep discharge protection in the event of a prolonged mains failure.