Altronix AL175ULB Power Supply...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$135.63
$119.98
Altronix AL175ULB Power Supply Board, Input 24VAC, 40VA Class 2 Transformer, 2 PTC Outputs, 12VDC at 1.75A, 24VDC at 0.9A

Altronix AL175ULB Power Supply Board, Input 24VAC, 40VA Class 2 Transformer, 2 PTC Outputs, 12VDC at 1.75A, 24VDC at 0.9A

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Model: AL175ULB

In Stock (leaves warehouse same day if ordered before 3pm ET)

$135.63
$119.98
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Altronix AL175ULB

Access Control Power Supply Charger, 2 PTC Class 2 Outputs, 12/24VDC @ 1.75A, Board
  • Input
    • Input 24VAC, 40VA. Class 2 transformer.
    • Fire Alarm Panel or Access Control trigger input.
  • Output
    • 12VDC or 24VDC selectable outputs.
    • 12VDC @ 1.75A or 24VDC @ 0.9A supply current.
    • Two (2) Class 2 Rated power-limited outputs.
    • Fail-Safe/Fail-Secure lock output (switched).
    • Auxiliary power output (unswitched).
    • PTC protected outputs, rated @ 2.5A.
    • Filtered and electronically regulated output.
    • Short circuit and thermal overload protection.
  • Battery Charging
    • Built-in charger for sealed lead acid or gel type batteries.
    • Automatic switch over to stand-by battery when AC fails.
    • Maximum charge current: 0.4A.
    • (Batteries are sold separately).
  • Supervision
    • AC fail supervision (form "C" contacts).
    • Supervised Fire Alarm Disconnect (Latching w/reset or Non-Latching).
  • Visual Indicators
    • AC input and DC output LED indicators.
  • Temperature
    • Operating: 0° C to 49° C (32° F to 120° F).
    • Storage: - 20° C to 70° C ( - 4° F to 158° F).
    • Relative Humidity: 85% +/- 5%.
    • BTU/Hr. (approx.): 11 BTU/Hr.

Manufacturer Resources

Product Specs

Warranty:
Lifetime
Subcategory:
Access Power Controller With Power Supplies
Commercial/Residential:
Commercial
Product Group:
Electronic Access Controls
Product Subgroup:
Power Supplies
Product Type:
Boards
Tags:
altronix al175
Product Voltage:
120V
Product Category:
Electronic Access Controls
Department:
Door Hardware

Altronix AL175ULB – Frequently Asked Questions

1) Will the Altronix AL175ULB power supply board run a 12V maglock and a 24V strike at the same time?
No. The AL175ULB is a selectable-voltage board, not a dual-voltage one: you set it for either 12VDC at 1.75A or 24VDC at 0.9A, and both of its outputs run at whatever you selected. If the job has a 12V lock and a 24V device on the same opening, you need two power supplies or a board that provides both rails.
2) How many maglocks or electric strikes can the Altronix AL175ULB actually power?
Size it by current, not by output count. At 12VDC you have 1.75A total and at 24VDC you have 0.9A total, shared across the two outputs, and that budget also has to cover the battery charging load and anything on the auxiliary output. A single maglock plus a reader typically fits at 12V; two maglocks usually does not. Add up the holding current of every device on the door and stay under the rail rating.
3) Does the AL175ULB drop the locks on a fire alarm signal?
Yes, that is what the fire alarm disconnect input is for. The board takes a trigger from a fire alarm panel or an access control output and cuts the switched lock output, and the disconnect is supervised. You can configure it latching (requires a reset after the alarm clears) or non-latching (restores power automatically). That is the input an AHJ looks for on a maglock installation.
4) What is the difference between the switched and unswitched outputs on the AL175ULB?
The switched output is the lock output: it follows the fail-safe/fail-secure setting and drops when the fire alarm disconnect trips. The auxiliary output is unswitched, so it stays live through the alarm. Put the maglock or strike on the switched output and put the reader, keypad, or REX device on the auxiliary so your access control gear does not reboot every time the fire panel trips.
5) Is the AL175ULB a fail-safe or fail-secure power supply?
Either, and that is a wiring decision you make at the board, not a version you order. The switched lock output can be set fail-safe (power holds the door locked, and losing power or a fire alarm trip unlocks it, which is how maglocks and fail-safe electric strikes work) or fail-secure (power releases the latch, and the door stays locked when power drops). Egress code on the opening usually decides which one you use.
6) My Von Duprin PS873 power supply failed. Is the Altronix AL175ULB the right replacement board?
That depends on what failed. For a PS873 whose relay board is the problem, the Command Access VD2-873 is a replacement relay board built for the Von Duprin PS873 and drops into that housing. The AL175ULB is a standalone access control power supply and charger board with its own 24VAC, 40VA Class 2 transformer input, 12 or 24VDC selectable output, and AC fail supervision on form C contacts, so it replaces the supply function rather than slotting into an existing PS873 as a board-for-board swap.
7) Is the Command Access DS1+ board a substitute for the Altronix AL175ULB?
No. The AL175ULB is a power supply and battery charger board: it takes a 24VAC, 40VA Class 2 transformer input and puts out selectable 12VDC at 1.75A or 24VDC at 0.9A across two PTC-protected Class 2 power-limited outputs, with a built-in charger for sealed lead acid or gel batteries and automatic switch over to standby battery when AC fails. The Command Access DS1+ is a delay/sequencer board operating on 12-24VDC with bi-directional control, so it is powered from a supply rather than being one. On an opening where two leaves must release in sequence and you also need the DC power, the two boards do different halves of the job and can sit in the same enclosure.
8) I need a board that programs door sequencing logic, not just DC power. What should I look at instead of the AL175ULB?
Look at the Command Access DS1-X, a multi-function door sequencing relay board with 13 programmable functions. The AL175ULB's switching is limited to what an access power controller does: one fail-safe/fail-secure lock output that is switched, one unswitched auxiliary output, and a supervised fire alarm disconnect that can be set latching with reset or non-latching. If the job calls for timed sequencing choices beyond that, the DS1-X carries the programmable functions and the AL175ULB supplies and charges.
9) Do I need a separate transformer for the Altronix AL175ULB, and what does it plug into?
The AL175ULB is supplied as a board with a 24VAC 40VA Class 2 transformer input, and it is fed from a 120V branch circuit through that transformer. Because it ships as a board rather than a boxed unit, plan on an enclosure and on standby batteries, which are not included.
10) What batteries does the Altronix AL175ULB charge, and how big can they be?
The onboard charger handles sealed lead acid or gel cells and charges at a maximum of 0.4A, and the board switches over to battery automatically when AC drops. Batteries are not included. The 0.4A ceiling is what decides your standby sizing: a large amp-hour pair takes a long time to recover after a long outage, so match the battery capacity to how quickly the system has to be back to full standby.
11) Can I get a trouble signal to my alarm panel if the AL175ULB loses power?
Yes. The board has AC fail supervision on form C dry contacts, so you can wire either the normally open or normally closed leg back to an alarm panel zone or a building automation input and get notified when utility power drops. There are also AC input and DC output LEDs on the board for a quick visual check at the cabinet.
12) What happens on the AL175ULB if an installer shorts a lock wire in the field?
The outputs are PTC protected and rated at 2.5A, with short circuit and thermal overload protection, so a shorted run trips the PTC rather than blowing a fuse. Clear the fault and the PTC resets itself, no parts to replace. Output is filtered and electronically regulated, which matters for readers and boards that are fussy about ripple.
13) Do I need a power supply like the AL175ULB or just a door sequencing relay board?
They do different jobs and are often used together. The AL175ULB makes the power: it converts 24VAC input to a regulated 12 or 24VDC lock supply with battery backup and a fire alarm disconnect. A board like the Command Access DS1+ is a delay/sequencer with bi-directional control, and the DS1-X adds 13 programmable functions for timing a sequence of door devices. Those sequencers switch and time an existing supply; they do not replace it. If you are timing a strike against an operator, you want a sequencer downstream of a supply like this one.
14) Are the AL175ULB outputs power limited for a Class 2 wiring run?
Yes. Both outputs are Class 2 rated and power limited, and the input side uses a Class 2 40VA transformer. That is what lets the low voltage runs be installed as Class 2 circuits, which is the usual expectation on an access control job in a commercial building.
15) What is the difference between the Command Access DS1+ and the DS1-X?
Both are Command Access relay boards for door control, but they are different series: the DS1+ is a delay/sequencer board rated 12-24VDC with bi-directional control, while the DS1-X is a multi-function door sequencing relay board carrying 13 programmable functions. Either can be fed from a 12 or 24VDC source such as the Altronix AL175ULB, which supplies 12VDC at 1.75A or 24VDC at 0.9A.
16) Can I mount an Altronix AL175ULB power supply board in an unconditioned space like a parking garage or attic?
Operating range is 0 to 49 degrees C (32 to 120 degrees F) at 85 percent relative humidity, so an unheated garage in a cold climate is out of spec. Storage tolerates -20 to 70 degrees C. Heat load in the cabinet is minimal at roughly 11 BTU per hour, so a sealed enclosure is not a thermal problem in a conditioned closet.
How fast can I get the Altronix AL175ULB 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 Altronix AL175ULB come with a warranty?
Absolutely. The Altronix AL175ULB 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 Altronix AL175ULB?
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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