Altronix AL175ULX Two Output Switching Power Supply / Charger 12 / 24 Volt DC at 1.75 Amps Class 2

Both, but you pick one. The AL175ULX is field selectable for 12VDC or 24VDC output, and the setting applies to the unit, so both of its outputs run at whatever voltage you select. Supply current is 1.75 amps total at either voltage. If you have a mix of 12V and 24V devices on the same opening, you need two supplies or a different board.

Budget against 1.75 amps total, not per output. The AL175ULX has two individually PTC protected Class 2 outputs, but they share the same 1.75 amp supply. Two maglocks drawing roughly a half amp each fits with headroom; a motorized latch retraction device with a high inrush does not. Add up the holding current of every device you intend to hang on it before you commit.

It switches over automatically to a stand-by battery when AC fails, and the unit is a charger as well as a supply, so it keeps the battery topped up while AC is present. The battery itself is a separate purchase, sized to how long you need the openings to hold.

Not enough for most delayed egress or motorized latch retraction hardware. Those draw well past 1.75 amps on inrush. For delayed egress, the BEST PS161-6 is a 120V input, 12/24V output supply rated at 6 amps and built specifically for that hardware; for motorized latch retraction, the BEST RPSMLR2 Series is the purpose-built option. The AL175ULX suits maglocks, strikes, readers and controller loads that fit inside 1.75 amps.

The Altronix AL175ULX is a switching power supply and charger that converts a 115VAC 60Hz input into two individually PTC protected outputs, selectable 12VDC or 24VDC, at 1.75 amps, and switches over to standby battery automatically when AC fails. The Securitron AQD1 is a switching power supply rated 12/24 VDC at 1 amp, so it holds the same dual voltage selection and switching topology at a lower current. The Adams Rite PS-1 is a regulated 1 amp 12/24 volt DC supply with battery backup, which matches the AL175ULX on dual voltage and on the backup battery. The Von Duprin PS902 base power supply is 2 amps, field selectable 12/24 VDC, for access control.

The Altronix AL175ULX includes an enclosure, a charger, and two PTC protected Class 2 outputs. When the job needs more than two protected runs out of one box, the RCI DKPS-2A is a power supply with 8 outputs at 12/24VDC and 2 amps for access control systems. That is a distribution difference rather than a voltage one, since both are 12/24VDC low voltage DC for access control.

The AL175ULX is a general purpose 12/24VDC supply at 1.75 amps with two PTC protected Class 2 outputs, not a device specific controller. Motorized latch retraction has an inrush demand that is met by a dedicated supply such as the BEST RPSMLR2 Series, which is built as a power supply for motorized latch retraction exit devices. Delayed egress is served by the BEST PS161-6, a power supply for delayed egress exit devices with 120V input, 12/24V output and 6A capacity. The Detex 10-800 Series is a universal logic controller with a 120VAC/24VDC power supply and battery backup where the opening needs sequencing logic rather than power alone.

Two items sit near the AL175ULX in an access control bill of materials without replacing it. The Command Access CAT Field Tester is a portable 12-24VDC power supply that runs off DeWalt, Makita and Milwaukee batteries - it is a bench and field test tool, not a fixed 115VAC fed supply. The ROFU 10305-LA/10306-LA is a tamper resistant power transfer hinge rated 1.5A at 42V, which carries power through the door edge rather than generating it. The AL175ULX itself converts a 115VAC 60Hz input into two 12VDC or 24VDC outputs, which is the function neither of those parts performs.

A dedicated 115VAC 60Hz circuit, drawing 0.6 amp on the primary side. That is standard building power, so an electrician can land it on a normal 120V branch circuit. No transformer or step-down is required ahead of it.

The AL175ULX measures 8.5 x 7.5 x 3.5 inches, and the enclosure is included, so nothing extra is needed to mount it. Allow room above the door frame or in the closet for that footprint plus conduit entry and the stand-by battery, which sits alongside or below in most installs.

Class 2 outputs are power-limited, which is why the low voltage wiring to your locks and readers does not have to be run in conduit the way line voltage does. Both of the AL175ULX outputs are Class 2 and individually PTC protected, so a short on one door trips that leg and resets itself once the fault is cleared, instead of taking down the whole system or blowing a fuse you have to replace.

Closest on capability is the Securitron AQD1, a switching supply with 12/24 VDC selectable output at 1 amp. The Von Duprin PS902 is a 2 amp 12/24 VDC field selectable base power supply, which gives you a bit more headroom. On the linear side, the SDC 631 is a 1.5 amp dual voltage controller and the SDC 632 is the 2 amp version. The AL175ULX sits between the AQD1 and the PS902 at 1.75 amps, with two protected outputs rather than one.

Two doors is the practical limit, since the AL175ULX gives you two individually protected outputs. For a bank of openings off a single board, the RCI DKPS-2A carries 8 outputs at 12/24VDC and 2A. Splitting the AL175ULX outputs further with wire nuts loses you the per-door fault isolation that the individual PTC protection buys.

You get the board, the enclosure and the battery charging circuit, with two PTC protected Class 2 outputs. The stand-by battery is not part of it, so order sealed lead acid batteries to match the output voltage you select. Wiring, conduit and any access control panel or reader are separate as well.

The AL175ULX is a two output 12 or 24 volt supply with a charger and enclosure, which is more than a single strike needs. For one 12 volt opening the ROFU 9126T is a plug in mini power supply, 12 VDC at 1.5A with time delay built in, so it handles the strike and the release timing without a wall box. The Command Access PS1 Series is a 24VDC linear power supply with 1 amp output if the device is 24 volt only. Neither carries the standby battery changeover the AL175ULX performs when AC fails, so choose them where backup power is not required.

The AL175ULX requires a 115VAC 60Hz input at 0.6 amp to produce its 12 or 24VDC outputs, so it needs line power at the enclosure. Where no AC run reaches the location, the Securitron BPSS is a boxed solar power supply. For a location that does have line voltage but needs a different input arrangement, the ROFU 9102-12D UL/9102-24D takes a 10/120VAC 60Hz input.

The AL175ULX generates power - it converts a 115VAC 60Hz input into two individually PTC protected 12VDC or 24VDC outputs and charges a standby battery. If a supply is already in place and the need is only to control and distribute that power, the BEST ELR150 Series is a power supply control module for electronic access control. The Locknetics LP Series 150 and 250 is offered as a power supply with enclosure. Match the choice to whether the opening lacks a source of DC power or lacks control over it.

Commercial. It is an access power controller with power supply, sold for commercial installations, and it lands on a 115VAC circuit with a metal enclosure, a battery charger and two protected low voltage outputs. That is the standard arrangement for card readers, maglocks and electric strikes in an office, school or multi-family building.