AJAX EN54 (Sounder) is an addressable alarm device (siren) in the EN 54 system. What is unique here is that it is a pure siren unit – designed for a clear, synchronised evacuation signal without mixing detection in the same casing.

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How it is used in practice

Used when you want to control alarm devices separately per zone/area: stairwells, corridors, open spaces and escape routes. You can place them where the sound is needed the most and let the detectors be where the risk assessment requires, making it easier to optimise both coverage and sound image.

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