Von Duprin PS904 Base Power Su...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$735.00
$498.66
Von Duprin PS904 Base Power Supply 4A 12/24 VDC Field Selectable for Access Control

Von Duprin PS904 Base Power Supply 4A 12/24 VDC Field Selectable for Access Control

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Model: PS904
$735.00
$498.66
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$735.00
$498.66
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Von Duprin PS904 Base Power Supply 4A 12/24 VDC Field Selectable for Access Control

Consolidated PS900 Series Power Supply for Commercial Access Control Applications

The Von Duprin PS904 Base Power Supply is part of the PS900 Series, a consolidated line of power supplies and accessories engineered to deliver enhanced flexibility and functionality for the evolving access control market. This unit converts high-voltage AC input (universal 120–240 VAC) into low-voltage DC outputs—either 12 VDC or 24 VDC—selectable via a field-selectable jumper, providing a constant output rating at both voltages for superior performance. UL 294 certified and Class 2 rated, the PS904 delivers filtered and regulated power that protects downstream access control devices in demanding commercial environments.

Professional Features & Benefits

  • Field-Selectable Voltage Output: Constant output rating at both 12 VDC and 24 VDC via an included field-selectable jumper, providing superior performance and installation flexibility across a wide range of access control devices.
  • Universal AC Input: Accepts universal 120–240 VAC input, making the PS904 compatible with standard commercial power infrastructure without requiring additional transformers or adapters.
  • Class 2 Rated & Regulated Output: Delivers low-voltage DC power that is filtered and regulated, protecting downstream devices and meeting Class 2 power requirements for safe, code-compliant installations.
  • UL 294 Certified: Fully certified to UL 294—the recognized standard for access control equipment—ensuring compliance and reliability in commercial security applications.
  • Electronic Power Limiting Foldback Circuit: Built-in AC current overload protection via electronic power limiting foldback circuit, along with a fused primary input, safeguards connected devices and the power supply itself.
  • Polarized Connectors & Flat Option Board Mounting: Polarized connectors for option boards eliminate the need for racks and side connectors, while flat mounting of option boards provides easier access to terminal blocks for connection of electrified devices.
  • AC Status Monitor & LED Indicators: Isolated SPDT contacts for AC status monitoring, plus AC input and DC output LED status indicators and cover-mounted AC input indication, enable quick visual verification of system status.
  • Fire Alarm Relay Configurable: The fire alarm relay can be configured to provide either switched or un-switched outputs from the power supply, supporting integration with emergency systems.
  • Battery Back-Up Board Auto-Selects Voltage: Compatible battery back-up board automatically selects the correct voltage, ensuring seamless transition to backup power without manual intervention.
  • Hinged Cover with Lock-Down Screws & High Voltage Protective Cover: Secure enclosure design with a hinged cover, lock-down screws, and a high-voltage protective cover for safe access and tamper resistance.
  • Extensive Option Board Ecosystem: Compatible option boards include the 900-4R (4 relay controlled output board), 900-4RL (4 relay distribution board with logic for time delay, auto operator, and security interlock), 900-8F (8 individually fuse-protected outputs), 900-FA (emergency fire alarm interface relay), 900-BB (battery backup), 900-2RS (2 relay EL panic device control board, PS914 only), and 900-BBK (battery backup kit with two 7A/hr batteries providing up to four hours of backup power when cycled every 5 minutes at full load).
  • Grade 1 Commercial Rating: Rated Grade 1 for use in demanding commercial access control installations where reliability and durability are essential.

Technical Specifications

  • Product Group: Electronic Access Controls
  • Series: Electrical Products
  • Grade: Grade 1
  • Product Subgroup: Power Supplies
  • Subcategory: Power Supplies
  • Product Type: Power Supplies
  • Commercial/Residential: Commercial
  • Product Category: Electronic Access Controls
  • Department: Door Hardware

Professional Applications

  • Commercial Building Security and Access Control Systems
  • Healthcare Facility Access Control and Emergency Egress
  • Educational Institution Safety and Security Systems
  • Retail Loss Prevention and Entry Management
  • Industrial Facility Monitoring and Access Points
  • Government and Municipal Building Security Infrastructure
  • Multi-Tenant Residential and Mixed-Use Property Access Control

Why Choose Von Duprin Quality?

Von Duprin PS900 Series power supplies are UL 294 certified and Class 2 rated, delivering filtered and regulated low-voltage DC power engineered for the rigorous demands of commercial access control. The PS904 supports a broad ecosystem of compatible option boards—including relay, logic, fuse-protection, fire alarm interface, and battery backup configurations—providing the flexibility to scale and adapt to complex security system requirements. With Grade 1 commercial ratings and a robust, field-configurable design, Von Duprin power supplies are a trusted foundation for professional access control installations where dependable performance is essential.

Product Specs

Product Group:
Electronic Access Controls
Series:
Electrical Products
Grade:
Grade 1
Product Subgroup:
Power Supplies
Subcategory:
Power Supplies
Product Type:
Power Supplies
Commercial/Residential:
Commercial
Product Category:
Electronic Access Controls
Department:
Door Hardware

Von Duprin PS904 – Frequently Asked Questions

1) Will the Von Duprin PS904 run 24 VDC electrified locks, or is it 12 volt only?
Either one. The PS904 is a field-selectable supply: a jumper on the board sets the output to 12 VDC or 24 VDC, and it holds the same 4A constant output rating at both voltages. So a job that mixes 12 volt strikes and 24 volt electric latch retraction still only needs you to stock one part number, you just set the jumper per enclosure. Input is universal 120-240 VAC, so no separate step-down transformer is required on standard commercial power.
2) What do I have to order with a PS904 power supply to control door strikes or maglocks?
The PS904 by itself is a base supply, it puts out filtered, regulated DC and nothing more. Switching or distributing that power to individual openings takes an option board, and you pick one when you order: 2 relay output, 2 relay with fire alarm interface, independently controlled relay, independently controlled relays with FA, 4 relay with integrated logic (time delay, auto operator, security interlock), 4 relay integrated logic with FA, or fire alarm relay only. You can also order it with no board at all if you already have distribution downstream. Battery backup kit and a key lock cover are separate yes/no choices on the same order.
3) How long will a Von Duprin PS904 keep doors powered if the building loses power?
With the 900-BBK battery backup kit, the PS904 runs on two 7 amp-hour batteries and gives up to four hours of backup when the doors are cycled every 5 minutes at full load. Real duration on your job depends on how hard the openings get used. The backup board auto-selects the correct voltage, so you don't have to reconfigure it to match whether you set the supply for 12 or 24 volts. Battery backup is a yes/no option at order time, so specify it up front rather than adding it later.
4) Does the PS904 power supply drop power to the doors when the fire alarm trips?
That's what the FA option covers. The PS904's fire alarm relay can be set up to give either switched or un-switched output, meaning you decide whether an alarm signal kills power to the connected devices or leaves them energized. Order it as fire alarm relay only if that's all you need, or take a distribution board with FA built in (2 relay with FA, independently controlled relays with FA, or 4 relay integrated logic with FA) when you also need the outputs split out. Boards without FA have no alarm interface, so the openings won't respond to the panel.
5) Is a 4 amp power supply enough for my access control panel, and what if I need more current?
4A at either 12 or 24 VDC is the PS904's ceiling, which covers a typical run of strikes, maglocks or card readers on a handful of openings but not a large motorized-latch-retraction bank, which pulls heavy inrush. If your load runs past it, the SDC 634 Series is a 4 amp regulated and filtered supply with dual voltage selection, the Securitron AQS1210 is a 12 VDC 10 amp switching supply, and the Altronix AL1024ULACMCB gives 24VDC at 10A across 8 PTC outputs. For a smaller job, the Securitron AQL4 is 12/24VDC at 4/3 amps and the SDC 632 is a 2 amp version of the same regulated design.
6) Will a Von Duprin PS904 run a motorized latch retraction exit device?
Motorized latch retraction devices draw a heavy inrush at the moment of retraction and are normally powered by a supply built for that duty. The BEST RPSMLR2 Series is a power supply specifically for motorized latch retraction exit devices, and the BEST PS161-6 is a power supply for delayed egress exit devices with 12/24V output at 6A capacity. The PS904 is a 4A 12/24 VDC base supply for access control devices, with 900 series option boards including the 900-2RS 2 relay EL panic device control board, which is listed for the PS914 rather than the PS904. Confirm the current draw of your specific exit device against the supply you choose.
7) What is the closest 4 amp alternative to the Von Duprin PS904 for a 12 or 24 VDC access control panel?
The Von Duprin PS904 supplies 4A field-selectable between 12 and 24 VDC. Two peers match that current class with dual voltage selection: the SDC 634 Series is a 4 amp regulated and filtered low voltage power supply with dual voltage selection, and the Securitron AQL4 is a switching power supply rated 12/24VDC at 4/3 amps. The SDC 634 is a linear regulated and filtered design; the AQL4 is a switching design, which is the main difference in how each conditions its output. If you want the same option board ecosystem the PS904 uses, including the 900-4R relay board and the 900-BBK battery backup kit, stay with the PS904.
8) I only need to power one electric strike, not a whole access control system. Is there a smaller supply than the PS904?
Yes. The PS904 is a 4A supply built to feed multiple devices through 900 series distribution boards. For a single strike or maglock, smaller regulated supplies with the same 12/24 VDC dual voltage selection include the SDC 620 Series at 1 amp, the SDC 631 Series at 1.5 amps, and the SDC 632 Series at 2 amps. The Command Access PS1 Series is a 24VDC linear supply with 1 amp output if 24 volts is all the opening needs, and the Adams Rite PS-1 is a 1 amp 12/24 VDC regulated supply that includes battery backup.
9) The PS904 is not enough amperage for my door count. What is a higher output option?
The Von Duprin PS904 is rated 4A. When the load list runs past that, the BEST PS161-6 takes 120V input and delivers 12/24V output at 6A capacity, and the Altronix AL1024ULACMCB is a power supply and access power controller with 115VAC 60Hz input at 4.2A that produces 24VDC at 10A across 8 PTC outputs. The Securitron AQS1210 is a switching supply at 12 VDC and 10 amps, but it is single voltage, so it suits a 12 volt only system rather than a mixed 12 and 24 volt one.
10) How do I keep tenants or staff out of the power supply enclosure?
Order the PS904 with the key lock cover option. The enclosure already has a hinged cover with lock-down screws and a separate high-voltage protective cover over the line side, but the keyed cover is what stops casual access in a corridor, a shared electrical closet, or a multi-tenant space. Every distribution board combination is available with or without it, including the no-board and battery-backup versions, so adding it doesn't force a different board choice.
11) How can I tell whether a PS904 is actually getting power without opening the cabinet?
There is AC input indication mounted on the cover, so a walk-by tells you the supply is live. Inside, separate AC input and DC output LEDs let you split a dead opening into a line-side or load-side problem in seconds. For remote monitoring, the PS904 has isolated SPDT contacts for AC status, so a head-end or building system can be told the moment utility power drops rather than finding out when the batteries run flat.
12) What protects the connected devices if something shorts on a PS904 circuit?
Two layers. An electronic power limiting foldback circuit handles AC current overload by pulling the output back instead of letting the supply cook, and the primary input is fused. If you want each opening isolated from the others so one shorted strike doesn't take down the rest, the 900-8F board gives 8 individually fuse-protected outputs. That's the board to specify when a single supply feeds several doors and you can't afford one fault to drop them all.
13) What's the difference between the 2 relay board and the 4 relay board on a PS904?
Straight switching versus switching with logic. The 900-4R is a 4 relay controlled output board, it just switches outputs. The 900-4RL is a 4 relay distribution board that adds integrated logic for time delay, auto operator sequencing, and security interlock, which is what you need for a vestibule where two doors can't be unlocked at once or where a card read has to trigger an operator after the lock releases. If the doors just need power switched on a signal, the 2 relay output board covers it and costs you less board to wire.
14) Is there a cheaper single-door power supply than the Von Duprin PS904?
For one opening, 4 amps and a relay board ecosystem is more supply than the job needs. The SDC 620 Series is a 1 amp regulated and filtered supply with dual voltage selection, the Command Access PS1 Series is a 1 amp 24VDC linear supply, and the Securitron AQD1 is a 12/24 VDC 1 amp switching unit. The Adams Rite PS-1 is 1 amp at 12/24 volts DC with battery backup included if you still want standby power on a single door. Step up to the PS904 when you're feeding several openings from one cabinet or need fire alarm interface and interlock logic.
15) Can I standardize on the PS904 across a whole building or campus?
That's what the PS900 Series is built around. One base supply covers both 12 and 24 volt openings by jumper, the same option boards drop onto it as door functions change, and the enclosure, indication, and fire alarm behavior stay identical from door to door. For a facilities or MRO buyer that means one spare on the shelf instead of a shelf of one-offs, and technicians who learn one cabinet. It's rated Grade 1 commercial, so it's specified for the traffic in schools, hospitals, and multi-tenant buildings rather than light-duty use.
16) Will a Von Duprin PS904 work on 208 or 240 volt power in an existing electrical room?
Yes. Input is universal 120-240 VAC, so the PS904 lands on standard commercial branch circuits at either end of that range without a buck transformer or an adapter ahead of it. On a retrofit into an older electrical closet that's usually the difference between a straight swap and pulling a new circuit.
17) What is the difference between the Von Duprin PS904 and the Detex 10-800 controller?
They solve different halves of the same problem. The Von Duprin PS904 is a base power supply converting universal 120-240 VAC input to 12 or 24 VDC at 4A, with logic added through option boards such as the 900-4RL relay distribution board with time delay, auto operator and security interlock logic. The Detex 10-800 Series is a universal logic controller that comes with a 120VAC/24VDC power supply and battery backup, so the logic is the core of the unit rather than an add-on board. Pick by whether you want the sequencing built in or want to choose the board that matches the sequence.
18) I need battery backup on the power supply. Which options include it?
The Von Duprin PS904 can be ordered with the battery backup kit, and the compatible 900-BB battery back-up board auto-selects the correct voltage, while the 900-BBK kit ships two 7A/hr batteries providing up to four hours of backup when cycled every 5 minutes at full load. Among peers, the Adams Rite PS-1 is a 1 amp 12/24 VDC regulated supply with battery backup, the Command Access PS204/204B is a linear supply at 2A 24VDC with battery backup, and the Detex 10-800 Series includes a 120VAC/24VDC supply with battery backup. The PS904 is the 4 amp option in that group.
19) Can I use a plug-in transformer style supply instead of a PS904?
Only for a very small load. The ROFU 9126T is a plug in mini power supply rated 12 VDC at 1.5A with time delay, which suits one device at 12 volts on a nearby receptacle. The ROFU 9102-12D UL and 9102-24D take 10/120VAC 60Hz input. The Von Duprin PS904 is an enclosed unit with a hinged cover, lock-down screws and a high voltage protective cover, accepting universal 120-240 VAC input and delivering 4A at 12 or 24 VDC with isolated SPDT contacts for AC status monitoring, which is what a monitored multi-door system is built around.
20) Is the Command Access CAT Field Tester a substitute for a PS904 on a permanent install?
No. The Command Access CAT Field Tester is a 12-24VDC portable power supply that runs on DeWalt, Makita and Milwaukee batteries, intended for testing a device at the opening. The Von Duprin PS904 is a permanently installed base supply with universal 120-240 VAC input, 4A output at 12 or 24 VDC, a fused primary input and an electronic power limiting foldback circuit for AC current overload protection. The tester confirms a device works; the PS904 is what stays in the wall and powers it.
21) I need multiple fused or PTC protected outputs from one supply. How does the PS904 compare?
The Von Duprin PS904 reaches multiple protected outputs through option boards: the 900-8F provides 8 individually fuse-protected outputs, the 900-4R is a 4 relay controlled output board, and boards mount flat with polarized connectors so no rack or side connectors are needed. Peers that build the outputs into the unit include the RCI DKPS-2A, with 8 outputs at 12/24VDC and 2A, and the Altronix AL1024ULACMCB, with 8 PTC outputs at 24VDC and 10A. The PS904 route lets you change the output board later without changing the supply.
22) For a facility standardizing on one access control power supply, how does the PS904 line up against a proprietary kit supply?
The Von Duprin PS904 is a Grade 1 commercial unit, UL 294 certified and Class 2 rated, with a field-selectable jumper for 12 or 24 VDC, so one part number covers both voltage families across a building. The Aiphone AC-PS1250 is a UL listed 12V DC 5A supply for AC Series access control kits, which ties it to that system and to 12 volts. If your facility mixes 12 volt strikes and 24 volt maglocks, the dual voltage unit is the one that standardizes.
23) There is no AC power run to the location. What are my options besides a PS904?
The Von Duprin PS904 requires an AC feed, since it accepts universal 120-240 VAC input and converts it to 12 or 24 VDC. Where no line voltage is available, the Securitron BPSS is a boxed solar power supply. For temporary power while testing a device before the AC run is complete, the Command Access CAT Field Tester is a 12-24VDC portable supply that runs on DeWalt, Makita and Milwaukee batteries.
24) Do I need a rack or backplane to add option boards to a PS904?
No rack, no side connectors. The PS904 uses polarized connectors for its option boards, and the boards mount flat, which also leaves the terminal blocks accessible when you're landing wires for electrified devices. That matters most on a retrofit where you're adding a board to an installed cabinet in a tight closet, you're not pulling the unit to get at the terminals.
25) Is a power transfer hinge an alternative to a power supply like the PS904?
No, and they are ordered together, not against each other. The ROFU 10305-LA/10306-LA is a tamper resistant power transfer hinge rated 1.5A at 42V that carries conductors from the frame into the door leaf. The Von Duprin PS904 is the source, converting 120-240 VAC to a filtered and regulated 4A at 12 or 24 VDC. A single electrified opening typically needs both: the supply at the panel and the transfer device at the hinge.
26) What is the difference between a switching supply and the linear supplies in this class?
It is a design difference in how the output is produced. Among 12/24 VDC peers, the Securitron AQD1 and AQL4 are switching power supplies, at 1 amp and 4/3 amps respectively, while the Command Access PS204/204B at 2A 24VDC and the Command Access PS210 at 1.5A 24VDC with boost circuitry are linear supplies, and the SDC 620, 631, 632 and 634 Series are regulated and filtered units at 1, 1.5, 2 and 4 amps. The Von Duprin PS904 delivers filtered and regulated Class 2 output at 4A on either 12 or 24 VDC and is UL 294 certified for access control equipment.
27) I need a lockable enclosure on the power supply for a tenant space. What are the choices?
The Von Duprin PS904 can be ordered with a key lock cover, and the standard enclosure has a hinged cover with lock-down screws plus a high voltage protective cover. Among peers, the Locknetics LP Series 150 and 250 amp power supply is supplied with an enclosure, and the Altronix AL1024ULACMCB comes in a grey enclosure. If tamper resistance at the box is the deciding factor, the key lock cover configuration of the PS904 addresses it directly.
How fast can I get the Von Duprin PS904 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Von Duprin PS904 come with a warranty?
Absolutely. The Von Duprin PS904 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Von Duprin PS904?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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