Vesda Xtralis VPS-215-E5 24V 0.5A Power Supply Unit (7AHR) Xtralis Power Supply Units are uniquely designed to complement the style and appearance of Xtralis aspirating smoke detectors (ASDs) and are technically matched to provide sufficient current and battery charging capacity to meet the requirements of EN 54-4. The Style E variants are VdS certified and CE marked to the EN54-4 so are particularly suitable for use in territories where these approvals are required. The 0.5A load with 7Ah batteries (max) is the budget unit within the range. It is intended as a low-cost unit to supply a single pipe ASD detector which only requires 7Ah batteries such as the VESDA VLF-250. A simple but elegant construction and no LEDs on the lid keep the cost of the unit to a minimum. The unit can also be inverted where necessary by rotating the lid. The internal charger is EN54-4 certified and internal LEDs are provided to indicate OK (output healthy) and Fault.