Altronix AL125ULB Installation Instructions User Manual
Al125ulb access control power supply/chargers

*Note: When unit is powered by battery back up (AC Fail condition) the voltage range is 9.3V-13.2V and
19.55V-26.4V for 12 and 24 volt operation respectively.
Power Supply Output Specifications:
Stand-by Specifications:
LED Diagnostics:
Agency Listings:
• UL recognized component.
• NFPA 101 (Life Safety)
Input Rating:
• 24VAC/40VA.
Output Rating:
• 12VDC or 24VDC selectable, Class 2 Rated
power limited outputs.
• 1 amp total supply current @ 12VDC or 24VDC.
• Filtered and electronically regulated output.*
Battery Backup:
• Built-in charger for sealed lead acid or
gel type batteries.
• Maximum charge current: 400mA.
• Automatic switch over to stand-by battery when
AC fails.
Special Features:
• AC power and unit status indicator on the
front panel.
• “NO” trigger input.
• Supervised Fire Alarm Disconnect (Latching w/reset or
Non-Latching).
Board Dimensions (approximate):
3.1”W x 3.9”L x 1.4”H
Overview:
The AL125ULB is a power limited power supply/charger that converts a low voltage AC input into two individually
PTC protected 12VDC or 24VDC outputs (see specifications). They are intended for use in applications requiring
UL Listing for Access Control (UL 294) and applications requiring an interface with Fire Alarm Control Panels.
Specifications:
AL125ULB
Access Control Power Supply/Chargers
Output VDC
Switch Position
Max. Stand-by Load DC
Max. Alarm Load DC
Battery (optional)
12VDC
SW2 Open
1 amp
1 amp
12VDC
24VDC
SW2 Closed
1 amp
1 amp
24VDC
Output
4 hr. of Stand-by &
5 min. of Alarm
12VDC/4AH Battery
Stand-by = .5 amp
Alarm = 1 amp
24VDC/4AH Battery
Stand-by = .5 amp
Alarm = 1 amp
Output
4 hr. of Stand-by &
5 min. of Alarm
12VDC/7AH Battery
Stand-by = 1 amp
Alarm = 1 amp
24VDC/7AH Battery
Stand-by = 1 amp
Alarm = 1 amp
Green (AC)
Power Supply Status
ON
Normal operating condition.
OFF
No DC output.
Slow Blink
Loss of AC.
Rapid Blink
Unit is triggered, awaiting reset. Fire alarm interface activated.