The new Elmdene TRS range of power supplies has been specifically designed for access control applications that require remote control of the power supply output. A typical example being where a TRS power supply unit is used to power magnetic door retainers; utilising a signal from the fire panel in order to switch off the output to the doors in the event of a fire alarm activation. 
 
The TRS PSU has a range of input options which includes the detection of a normally closed contact going open and also removal of a 24V dc signal to provide a fully fail safe operation mode (BS 7273 Compliant).