The BW54 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 a 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.



Model Output  Nom Float V Charger A  Power
BW5475-12 12 V 13.8 V 1.0A 75W
BW54100-12 12 V 13.8 V 1.4A 100W
BW54140-12 12 V 13.8 V 2.0A 140W
BW5475-24 24 V 27.6 V 0.6A 75W
BW54140-24 24 V 27.6 V 1.0A 140W


Input Voltage 240Vac  ( 200~264 )
Input Frequency 47 ~ 63Hz
Input Fuse Yes
Hold Up Time 30ms @ 230Vac input, full load and no battery connected.
Power Factor  0.42 @ 230Vac and  full load
No load Power  <5W
Start up Time  Typically 1.5 seconds
Output Voltage 13.8V  / 27.6V  Refer to table
Output Current Refer to table
Power Limit Typically at 115%
Efficiency 80-85% @ 230Vac and full load
OVP 105-125% latching. Recycle input after 30 seconds to restar
Short Circuit Protection Hiccup mode
Current Limit Primary side power limited
Thermal Protection Primary side ( non-latching )
Operating Temp.  -10ºC to +70ºC (Derate 2.5% / ºC above 50ºC)
Cooling Convection cooled
Humidity 10-95% non-condensing
Ripple & Noise 0.5% @ 230Vac , full load ( BW =DC-10Hz)
Safety EN60950, Class I
Insolation Input – Output / Case: 2200Vdc
EMC EN55022 Class B  Conducted
EN55022 Class A  Radiated
Immunity EN61000-3-2   Class A  Harmonics
EN61000-4-4   Fast TransientsEN61000-4-5    Surge
EN61000-4-11  Voltage Dips

Related Products