Product Description
900-4RL Von Duprin Power Supply Board — 4 Relay with Integrated Logic
Expert's Note: The 900-4RL is what gets spec'd on mantrap, airlock, and sally port configurations. The integrated logic handles security interlocking — door A can't unlock until door B is secured, and vice versa. Without this board, you'd need a separate interlock controller mounted somewhere in the ceiling or above the door, plus the wiring to connect it. The 900-4RL eliminates that extra box and puts the logic right in the power supply enclosure where it belongs.
Four relays with programmable sequencing for complex access control. Plugs into any PS900 series supply. For fire alarm integration, get the 900-4RL-FA.
Technical Specifications
| Type | 4 Relay Board with Integrated Logic |
| Logic | Security interlocking and sequencing |
| Application | Mantraps, sally ports, airlocks, secure vestibules |
| Fire Alarm | Optional (see 900-4RL-FA) |
| Installation | Plug and play into PS900 series |
Compatible Power Supplies
| PS902 | 2A base supply |
| PS904 | 4A base supply |
| PS914 | 4A with 16A inrush |
| PS906 | 6A base supply |
900-4R vs 900-4RL: The 900-4R gives you 4 relays without logic. The 900-4RL adds interlocking and sequencing. If the spec says "interlock" or "mantrap," you need the 4RL.
Lock Depot sells brand new Von Duprin products with the full manufacturer warranty.
