Battery Charger: 27V 3A 66W

The EN54 Series is a new generation / smart Power Supply that is designed to provide battery backed-up power in the event of either the PSU or the battery being disconnected or short circuited.

When the AC supply fails, the battery will automatically be connected and will provide power until the ac supply is restored. If the battery has reached it’s disconnect voltage, it will automatically be disconnected to prevent deep discharge damage.

Designed for powering critical loads with battery back-up, in a wide range of Industrial applications and in particular Security installations and Access Control, with separate Load and Battery Charging circuits.

A wide range of Signals, Led’s and Alarms, all aimed at providing the optimum solution for powering critical DC Loads. An isolated Common Fault relay has been provided which will operate if any fault is found (This is a fail-safe signal so will signal a fault even if no power sources are on/connected.



Input voltage 200 – 230 Vac +/-10%
Frequency Range 50-60Hz
Temperature Range 0 – 50ºC ambient (Convection cooled, cased)
Input fuse T2H 250V TR5
Input Current 1Arms (180Vacin, full load)
Hold-up Time 30mS (230Vacin, full load, no battery connected)
Power Factor 0.45 (230Vacin, Full load)
No Load Power 1.5W (230Vacin)
Start-up Less than 1.5 seconds
Output Voltage 27.6V (factory set for operation with thermistor)
Output Current 2.4A
Power limit 115% +/-10%
80-85% Typ.@ 230Vacin, Full load
OVP 105-125% (latching and non dissipative) recycle input to restart
Short Circuit protection Hiccup mode
Signals Mains Fail, Battery O/C, Charger Loss, Battery Low
– LED’s & open collector – 100mA sink, Status LED Green = Flashing = OK Common Fault (Volt free) relay
2x Customer options – open collector – 30mA sink HiZ indication =1J
Battery Powerfail signal = 100mS
Current limit Primary side power limit
Thermal protection Primary side thermal protection (non-latching)
Load regulation +/- 0.75%
Line regulation +/- 0.5%
Noise & ripple 0.5% (230Vacin, Full load, BW = DC – 10MHz)
Charger Current limited @ 0.6A
Temp compensation Connector provided for user to add 100KΩ  thermistor (β=4400) Suitable for standby use
Deep discharge protection 21V +/-0.25V
DDA non-isolated Single and Dual Output DC DC Converter 24V 12V output