VA300 PSU+/VA300 Audio Amplifier Power Supply


  • Four independent power supply outlets
  • DC 48 V battery input
  • Plug in/out


The VA300/PSU+ is an AC to DC converter unit designed specifically for use in critical life safety voice and alarm broadcast systems. The VA300/PSU+ energises up to four VA300+ audio amplifiers sited in a VA300/CAGE and incorporates no break electronic changeover to an external optional battery sub-system in event of primary AC mains disconnection. The unit consists of four supply converters conveniently fitted in a VA300/PSU+ single housing, each supply is supervised by an integral monitoring sub-system which drives fascia mounted indicators and a volt free power supply status is available to remote possible trouble report.

The unit is housed in a low profile module which connects to the host equipment by plug/socket terminations. VA300/PSU+ is designed for standard 19 inch rack mount execution and high power density enables a 2 unit high 252 mm deep footprint. The unit enables compliance with IMO standard for broadcast equipment (i.e. separate power supplies for each amplifier module) and meets emission and susceptibility standards to IEC60945. Switch-on surge is managed by staged AC mains connection and full thermal protection is included as well as comprehensive protection for each power supply channel. A timed delay is incorporated to prevent surges due to toroidal transformer residual flux polarity and a 60 A rated connector facilitates connection to an external battery pile. This product should be fed from an AC mains supply via a type D breaker. The VA300+ is designed for simple rapid installation and utilises plug/socket connectivity thereby obviating screw/bolt termination. Light weight construction enables safe/convenient transportation and installation into the target equipment.

Technical Data

Dimensions483 mm x 88 mm x 252 mm
(19.02 inch x 3.46 inch x 9.92 inch)
(19″ rack mount, 2 unit)
MaterialsEnclosure: sheet steel zinc, Finish: zinc and passivated
Fascia: alloy, Finish: semi gloss black
Weight15 kg (33.1 lbs)
Input VoltagePower suppy input: AC 115 V or AC 230 V ±5 %
Frequency: 50/60 Hz ±5 %
Output VoltageUnregulated DC 48 V, four channels
Output PowerOutput capability per channel: 1 x VA300 power amplifier module
PowerMaximum power demand: 1.8 kVA

*Refer to the documentation for more detailed information


Ambient temperature

-20 °C to +50 °C (-4 °F to +122 °F)



Data Sheet – VA300 PSU+/VA300 Audio Amplifier Power Supply