Altronix AL125UL Power Supply/Charger

The Altronix AL125UL is a UL 294-listed access control power supply and battery charger that converts 115VAC input into selectable 12VDC or 24VDC power at 1A total continuous output. Featuring two Class 2 power-limited outputs, fail-safe/fail-secure lock control, and supervised fire alarm disconnect, the unit supports electric locks, strikes, and access control equipment. Its built-in battery charger, automatic backup switchover, and lockable steel enclosure provide power management for commercial security installations.

Altronix AL125UL 12/24VDC 1A Access Control Power Supply and Battery Charger

The Altronix AL125UL Access Control Power Supply/Charger provides regulated DC power for electronic locking systems in commercial buildings, offices, educational facilities, and secured entrances. Converting 115VAC, 50/60Hz input into selectable 12VDC or 24VDC output, the unit delivers up to 1A total continuous current through two independently PTC-protected, Class 2 power-limited outputs. Its configuration includes a switched output for fail-safe or fail-secure locking devices and an unswitched auxiliary power output, supporting electric strikes, electromagnetic locks, and compatible access control equipment. The filtered, electronically regulated supply incorporates short-circuit and thermal overload protection to safeguard connected devices.

The AL125UL operates from a 115VAC, 50/60Hz, 0.5A input and provides a selectable 12VDC or 24VDC output rated at 1A total. Both Class 2 outputs feature auto-resettable PTC protection rated at 2.5A, while the shared supply capacity remains limited to 1A. An integrated battery charger supports sealed lead-acid or gel-type standby batteries with a maximum charging current of 400mA and automatically transfers connected loads to battery power during AC failure. The unit operates from 32 F to 120 F (0 C to 49 C) and features front-panel LED diagnostics indicating normal operation, loss of AC power, triggered status, or loss of DC output. Batteries are sold separately and must be selected according to the operating voltage and required standby duration.

The Altronix AL125UL incorporates a supervised fire alarm control panel (FACP) disconnect interface with selectable latching or non-latching operation. The interface uses a 2.2K ohm end-of-line resistor for supervision and supports fire alarm integration where locking hardware must respond to emergency conditions. A normally open access control trigger input accepts signals from compatible card reader controllers, request-to-exit devices, or access control systems. Dedicated terminals provide switched power for fail-safe magnetic locks or fail-secure electric strikes, while the auxiliary output remains unaffected by access control triggering or fire alarm interface operation. The unit also includes a reset input for latching fire alarm disconnect configurations, allowing installers to configure the required door release sequence.

The Altronix AL125UL Power Supply/Charger is supplied with an integrated transformer, power supply board, cam lock, and BC100 wall-mount steel enclosure for indoor installation. Manufacturer documentation specifies nominal enclosure dimensions of 8.5 x 7.5 x 3.5 inches (216 x 191 x 89 mm), with the enclosure accommodating a standby battery configuration appropriate to its available space. The unit is UL 294 listed for access control systems and cUL listed to CSA C22.2 No. 205-M1983, with NYC Department of Buildings approval and NFPA 101-related application documentation. Backed by an Altronix lifetime warranty, the AL125UL supports access control installations requiring regulated power, fire alarm interfacing, and optional battery backup. Installation must follow manufacturer wiring instructions, electrical codes, and applicable life safety requirements.