Power Supplies

Powerbox, PB251A-CM, 13.8v DC 16Amp Regulated Switch-Mode Power Supply

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PB251A Series Battery Chargers / DC UPS


The PB251A Series is a family of 13.8Vdc and 27.6Vdc 275W/330W off-line battery chargers / DC uninterruptible power supplies, which operate from 220/240Vac mains power. When connected to a lead-acid battery, these units provide uninterrupted power to a DC load in the event of a mains failure.


The PB251A contains a two-step current limited float charger, battery charge current limiting, a battery low voltage disconnect, mains/charger and battery alarms, battery present detection and optional float voltage temperature compensation (option -T). It employs high-efficiency switching technology, combined with very low output noise which makes it suitable for powering sensitive loads such as radio equipment.


The PB251A is available in chassis mount (CM) and 2RU 19″ rack mount (RML and B) variants. A supplementary heatsink (option – H) is available to increase the output power or maximum ambient temperature rating of the chassis mount variant. All models employ natural convection cooling.

The rack-mount (RML and B) variants incorporate an alphanumeric LCD display as standard. These variants are also available with analogue meters (option -M)



  • 220 – 330W Battery Charger System, 16 Amp
  • DC UPS Connectable
  • Constant Float Voltage Current Limit
  • Circuit Breakers Alarm Relays
  • Independent Battery Charging Output
  • DC OK Battery OK Alarms
  • Battery Connected Test
  • Battery Low Volts Disconnect
  • Optional Battery Charge Current Limit
  • Optional Network Connected
  • Optional Battery Temperature Probe


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