Cranford Controls

STE Power Supply Units 24Vdc – EN54-4 Approved

Product Overview

The STE range of Power Supplies are fully featured EN54-4:1997+A2:2006 VdS approved and have been specifically designed for Fire System Installations and associated applications.

They incorporate switch mode technology for voltage regulation which provides greater efficiency by greatly reducing wasted heat energy. Its regulated 27.6Vdc output will supply up to 5A continuous into the load, in addition to providing up to 1.6A for charging the standby batteries.

They feature intelligent battery management and Volt free fault outputs for remote signaling and full diagnostic LED display. They give a higher level of security than our 300 series with additional features and the benefit of the product approval.


  • Approved to EN54-4 by VdS
  • 2 and 5 amp versions
  • Separate battery housing and connection lead available
  • Energy-efficient design based on switch mode technology
  • Sturdy 1.2mm powder-coated steel enclosure with a hinged lid finished in white


Type 2 Amp 5 Amp
Supply Voltage 110 Vac to 230 Vac @ 50 Hz
Load Output @ 27.6Vdc 2.0A 5.0A
Battery Recharge Time 80% Capacity – 24 Hours
Temperature Range (°C) -10 to +40
Relative Humidity Up to 75%
Boxed Weight (kg) 6.2 6.2
Max Battery Capacity for PSU Up to 2 x 17Ah (Not Supplied)


Part Numbers

303-018 2 Amp, Housing takes 2 x 17Ah Batteries
303-019 5 Amp, Housing takes 2 x 17Ah Batteries
303-020 Battery Housing takes up to 2 x 38Ah Batteries
303-021 Battery Lead Connection for use with Battery Box Above