Power Supplies

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

Part Number:
Product Brochure

Trade pricing available via login.

SKU: POW851 Category:


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


There are no reviews yet.

Be the first to review “Powerbox, PB251A-CM, 13.8v DC 16Amp Regulated Switch-Mode Power Supply”

Related products

Latest News

The PentaCode dual coding system gives the installer the option to use the classic 12-way dipswitch coding or one of over 17 billion codes.

• 3 x Pentafob Remotes
• 1 x PCR43301RE Receiver
• Manual

Learn more: https://bit.ly/2Tahrjx

#elsema #fobkit #transmitters

Single Channel Stand-alone Penta Series 433MHz Receiver

• One channel receiver pre wired with relay output
• 12-way dip switch coding or one of over 17 billion encrypted codes.
• Antenna: Elsema ANT 433MHz series

Learn more: https://bit.ly/3dJlw7H

#elsema #1channel

4 Channel Penta Series 433MHz Receiver

• Four channel receiver with relay outputs
• 12-way dip switch coding or one of over 17 billion encrypted codes.
• Compatible with “PentaFOB®” and “PentaCODE®” remotes

Learn more: https://bit.ly/3ku21SY

#elsema #4channel #pentaseries

K2 is a single entry standalone Access Control with integrated keypad and card reader. It is waterproof, suitable for outdoor application.

Learn more: https://bit.ly/3dItxJY

#secukey #proxcard #AccessControl

SK5-X is a universal keypad, can work as standalone keypad, access controller or standard Wiegand output reader. It can read 125KHz EM & HID for Low Frequency and 13.56MHz Mifare for High Frequency tokens, cards and tags.

Learn more: https://bit.ly/3dJeOi1


Load More...