Product Description
900-4RL-FA Von Duprin Power Supply Board — Logic + Fire Alarm
Expert's Note: The 900-4RL-FA is the top-tier board in Von Duprin's PS900 system. It combines the security interlocking logic of the 900-4RL with an integrated fire alarm relay. Mantrap, sally port, and airlock configurations on life-safety applications — where both interlocking AND fire alarm are required by code — this one board handles it all. The logic controls the door sequencing, the FA relay handles the emergency override. Gets spec'd on correctional facilities, government buildings, courthouses, and high-security commercial jobs.
Technical Specifications
| Type | 4 Relay Logic Board + Integrated Fire Alarm |
| Logic | Security interlocking and sequencing |
| Fire Alarm | Integrated — no separate 900-FA needed |
| Application | Mantraps, sally ports, airlocks, secure vestibules |
| Installation | Plug and play into PS900 series |
| Compatibility | PS902, PS904, PS914, PS906 |
900-4RL vs 900-4RL-FA: Same interlock logic board. The FA version adds the fire alarm relay. If the spec requires both interlocking and fire alarm, this is the board.
Lock Depot sells brand new Von Duprin products with the full manufacturer warranty.
