Dorma PS501 Power Supply for ES Series Exit Devices

The PS501 is built for the Dorma ES-900 Series exit device with electric latch retraction. It is a device-specific supply, not a general-purpose access control power supply, so pair it with ES electric latch bolt retraction hardware rather than treating it as a generic 24VDC source for strikes and mag locks.

Line side is 120 volts with a 1 amp circuit breaker for input protection. Output is 24 VDC, protected by a 4 amp fuse, and the output voltage is field selectable so the installer sets it at the box rather than ordering a different unit. An electrician needs a dedicated 120V circuit landed at the enclosure before the low voltage runs go in.

No. The PS501 is sold non-returnable because field conditions vary and wiring applications are not certified. Confirm the device type, the number of ES openings, and the 120V feed before you order, since a wrong call on this one is not reversible.

The PS501 powers and controls two exit devices, with 2 amp continuous per zone. When the door count is higher, multi-output units cover it: the Altronix AL1024ULACMCB is a power supply and access power controller with 8 PTC outputs at 24VDC and 10A from a 115VAC 60Hz 4.2A input, and the RCI DKPS-2A provides 8 outputs at 12/24VDC and 2A for access control systems. Both spread a single enclosure across more openings than the PS501 is arranged to handle.

Several peers pair the supply with a battery. The Command Access PS204/204B is a linear supply with 2A at 24VDC and battery backup, the Adams Rite PS-1 is a regulated 1 amp 12/24 volt DC supply with battery backup, and the Detex 10-800 Series is a universal logic controller with a 120VAC/24VDC power supply and battery backup. The PS501 is a 120 volt input, 24 VDC output unit with a 1 amp input circuit breaker and 4 amp output fuse in an 8 x 8 x 4 inch NEMA 1 enclosure, sized around driving the ES latch retraction rather than riding through an outage.

The BEST RPSMLR2 is a power supply built for motorized latch retraction exit devices, so it addresses the same job as the PS501, which powers and controls two exit devices with the ES electric latch bolt retraction feature. The PS501 is the Dormakaba-side answer for ES-900 Series exit devices specifically; the RPSMLR2 is the BEST-side answer for its own motorized latch retraction hardware. Match the supply to the exit device brand and retraction hardware you are actually installing.

They are close in concept but not interchangeable in capacity. The Von Duprin PS902 is a base power supply rated 2A at 12/24 VDC, field selectable, for access control. The PS501 outputs 24 VDC with a 14-18 amp surge and 2 amp at 5 volt continuous per zone, and is field selectable output voltage as well. The surge rating is the deciding number for latch retraction, since motorized retraction draws hard on startup, so confirm the inrush requirement of the exit device before treating the PS902 as a swap.

Three in particular. The ROFU 10305-LA/10306-LA is a tamper resistant power transfer hinge rated 1.5A at 42V - it carries power through the door edge, it does not generate it, and an opening may need both. The Command Access CAT Field Tester is a portable 12-24VDC supply that runs off DeWalt, Makita and Milwaukee batteries, a bench and troubleshooting tool rather than a permanent install. The BEST ELR150 Series is a power supply control module for electronic access control, a control stage rather than the boxed 120 volt input supply the PS501 is.

Indoor only. The PS501 ships in an 8 inch high by 8 inch wide by 4 inch deep NEMA 1 enclosure with a hinged cover and knockouts, which is a general purpose indoor box with no weather or washdown protection. Plan on an electrical room, closet, or above-ceiling interior location within conduit reach of the openings.

The PS501 is matched to Dorma ES electric latch retraction, so on other brands of hardware look elsewhere. BEST offers the RPSMLR2 Series power supply specifically for motorized latch retraction exit devices, and the BEST PS161-6 covers delayed egress exit devices with a 120V input, 12/24V output and 6A capacity. Von Duprin's PS902 base power supply is a 2A 12/24 VDC field selectable unit for access control.

Pulling a latch bolt back takes far more current for a fraction of a second than holding it. The PS501 is rated for 14-18 amp surge while supplying 2 amps at 5 volts continuous per zone, which is what lets it drive the motor or solenoid on an ES device at the moment of retraction and then settle back to holding current. A general purpose supply sized only to its continuous rating will brown out on that inrush.

For a single small load, a 1 amp supply is the simpler route. The Command Access PS1 Series is a 24VDC linear power supply with 1 amp output, and the SDC 620 Series is a 1 amp regulated and filtered low voltage supply with dual voltage selection. The PS501 is built to power and control two exit devices with the ES electric latch bolt retraction feature, so its two-zone output and 14-18 amp surge capacity exist for a load a single strike does not present.

Only for small loads with no exit device retraction involved. The ROFU 9126T is a plug in mini power supply rated 12 VDC at 1.5A with time delay, and the Securitron AQD1 is a switching supply at 12/24 VDC and 1 amp. The PS501 is a hard-wired 120 volt unit in an 8 inch high by 8 inch wide by 4 inch deep NEMA 1 indoor enclosure with hinged cover and knockouts, with a 1 amp input circuit breaker and 4 amp output fuse - a boxed, conduit-fed install rather than a plug-in.

The PS501 has field selectable output voltage. On the peer side, the SDC 631 Series is a 1.5 amp regulated and filtered DC power controller with dual voltage selection, the SDC 632 Series is the 2 amp version, and the SDC 634 Series is the 4 amp version - one family stepping up in capacity while keeping the same voltage selection. The Securitron AQL4 is a switching supply at 12/24VDC and 4/3 amp. Picking a family that spans capacities lets a facility carry fewer distinct part numbers across openings of different draw.

If the load is strictly 12 volt, a dedicated 12V supply is the cleaner match. The Aiphone AC-PS1250 is a UL listed 12V DC 5A supply for AC Series access control kits, and the Securitron AQS1210 is a 12 VDC 10 amp switching supply. The PS501 outputs 24 VDC with field selectable output voltage and is built around ES Series exit device latch retraction, so specify by the voltage and current the connected hardware actually calls for.

The Securitron BPSS is a boxed solar power supply, which addresses openings without a run of building power. The PS501 takes a 120 volt input and comes in an 8 x 8 x 4 inch NEMA 1 type enclosure for indoor use, so it presumes a conditioned interior location and a conduit feed. Confirm the mounting environment before committing, since the enclosure type governs where the unit can legally sit.