EN54-4 certified power supplies

Issue 2 2022 Fire & Safety

A fire alarm system requires a robust power supply to ensure the safe continuity of fire detection. The Technoswitch EN54-4 certified range of power supplies deliver additional built-in performance features that most others fail to provide. These features ensure that the PSUs provide reliable power and continuously monitor total performance.

On-demand load sharing capability

This feature runs automatically and continuously, giving the power supply exceptional flexibility. It allows rapid, large capacity battery charging with extended standby hold-up duration at light loads or short high current peak loads where spare output capacity is diverted to battery charging.

Each battery is connected separately

Most systems use two 12 V DC batteries connected in series to provide the 24 V DC needed to drive a fire system; the only way to check each battery’s performance is to disconnect it from the system. Technoswitch’s EN54-4 PSUs connect each battery separately, then seamlessly combine the two 12 V DC outputs into 24 V DC, enabling the unit to constantly measure each battery’s performance and report any problems individually.

Battery impedance monitoring

The weakest part of a conventional power supply is its batteries. Currently, most systems rely on battery voltage measurement, which cannot accurately predict if there is a problem until it is too late. The Technoswitch EN54-4 PSUs constantly measure the impedance of each battery and can flag up deterioration outside certain parameters.

Battery charging at too high an ambient temperature will dramatically shorten its life. The Technoswitch EN54 PSU range has onboard sensors to automatically adjust the charging rate depending on the temperature. A remote temperature sensor is also available for difficult environments.


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