Von Duprin power supply and option board products were designed to meet the specific requirements of electrified fire exit devices. Installation is simplified by utilizing a flat mounting design and polarized locking connectors for option boards. This design eliminates the need for racks and side connectors. The flat mounting of the option boards also provides for easier access to the terminal blocks for the connection of electrified devices. Common to the line of PS900 Series power supplies is a constant output rating at both 12v and 24v settings, universal 120V AC to 240V AC input, and polarized option board connectors. New fire alarm interface board mounting allows outputs to be configured as switched (power cut) or unswitched (power continues) when the signal is provided.