EN54-4 certified / SBF110:8 approved battery backup 24V 10 (A) Ampere with space for 2x 20Ah batteries. Protection for; overload, over voltage, over temperature, short circuit and deep discharge. Alarm for (3 outputs): Delayed mains failure alarm. (10 sec), low battery voltage, over/under voltage, disconnected battery, aged battery, battery capacity too low, cell short circuit, charger error, low system voltage, tripped load fuse. Output 4 is used for option; sabotage. 1 double-pole fused output + 1 single-pole (+) fused output. The well-ventilated enclosure is lacquered in black color with structure, LED for alarm indication and equipped with 3 knockouts for cable entries and a knockout in the back. The unit can be both wall-mounted and rack-mounted (reversible angles included). Please note that batteries are added. 5 year warranty. The EN54 series is mainly used in fire alarm systems where an EN54-4 approved battery backup is required. The EN54 series offers INTELLIGENT CHARGING, which means that when the batteries are fully charged, they will be disconnected electronically for standby mode for up to 20 days. By charging the batteries every 20 days (instead of not being used at all), the system contributes to extending the battery life by up to 50%. The batteries automatically reconnect in less than 50 microseconds when needed. The system is also equipped with internal power resistors for qualified battery capacity testing, which notify when the batteries need to be replaced. The EN54 series is system certified and tested together with AGM UPLUS 10+ Design Life 20Ah batteries. The EN54 FLX M series can be supplemented with up to 4 battery boxes if needed. The battery box is pushed into the underside of the battery backup and has room for up to 2x 45Ah batteries per each battery box. The battery boxes are easily connected via a pluggable connector.