Altronix AL400ULXB2 Power Supply Charger, Single Class 2 Output, 12/24VDC @ 4A, 115VAC, Board

The Altronix AL400ULXB2 is a UL-listed power supply/charger subassembly with field-selectable 12 VDC at 4 amps or 24 VDC at 3 amps, powered by a 115 VAC, 60 Hz input. Designed for access control, burglar alarm, fire alarm, and nurse call applications, it provides a single Class 2 power-limited, filtered, and electronically regulated output. The board features automatic standby battery switchover, integrated sealed lead-acid battery charging, Form C AC-fail and battery supervision contacts, and short-circuit and thermal overload protection. Its compact 7.1 x 4.5-inch design supports integration into compatible listed security equipment enclosures.

Altronix AL400ULXB2 12/24VDC 4A Power Supply and Battery Charger Board

The Altronix AL400ULXB2 is a UL-listed subassembly power supply and battery charger board designed to provide regulated 12 VDC or 24 VDC power for professional security and life safety systems. Manufactured by Altronix Corporation, the AL400ULXB2 converts a 115 VAC, 60 Hz primary electrical input into a single Class 2 power-limited DC output. Its field-selectable operating voltage supports 4 amps at 12 VDC or 3 amps at 24 VDC, allowing installers to configure the power supply for compatible access control equipment, intrusion alarm components, fire alarm accessories, and nurse call signaling systems. The board combines AC-to-DC power conversion, standby battery charging, and power supervision functions in a compact assembly intended for integration into appropriately listed equipment enclosures. The AL400ULXB2 replaces the earlier Altronix AL400ULXB and is suitable for new system installations, power supply repairs, and compatible equipment upgrades.

The AL400ULXB2 incorporates filtered and electronically regulated DC output circuitry with short-circuit and thermal overload protection to support consistent power delivery to connected equipment. Installers select either 12 VDC or 24 VDC using the onboard output voltage selection switch, with a maximum available supply current of 4 amps at 12 VDC or 3 amps at 24 VDC. The supply provides a single output rather than multiple individually fused or independently controlled circuits. Its input circuitry is designed for 115 VAC, 60 Hz operation with a manufacturer-specified maximum input current of 3.5 amps and a 3.5-amp, 250V input fuse. Onboard indicators provide visual confirmation of incoming AC power, active DC output, and battery trouble conditions. These features allow technicians to evaluate operating status and identify power-related problems during installation and scheduled maintenance. When additional output distribution or individually controlled locking circuits are required, the AL400ULXB2 can be integrated with appropriately rated Altronix distribution or access control modules.

The Altronix AL400ULXB2 includes an integrated charging circuit for compatible sealed lead-acid (SLA) or gel-type standby batteries. The manufacturer specifies a maximum charging current of 0.7 amp and a battery protection fuse rated at 15 amps at 32 volts. When the primary AC source fails, the power supply automatically transfers to connected standby batteries without a manual switching operation or additional voltage drop attributable to the transfer mechanism. The supply also provides Form C supervisory contacts for AC power failure, low battery, and battery presence conditions, allowing a compatible alarm control panel or monitoring system to identify power-related faults. The AC-failure notification delay can be configured for 30 seconds, the factory setting, or 6 hours according to system requirements. This configurable supervision helps distinguish brief utility disturbances from sustained AC power interruptions when permitted by the applicable installation requirements. Standby batteries are sold separately, and the required battery capacity must be calculated based on connected equipment, operating voltage, and specified standby and alarm durations.

The AL400ULXB2 is supplied as a compact circuit-board power supply and charger assembly measuring 7.1 inches long, 4.5 inches wide, and 1.44 inches high (180.3 x 114.3 x 36.6 mm). The board weighs approximately 0.65 pounds (0.29 kg) and is designed for integration into compatible power supply cabinets, access control enclosures, and Altronix equipment assemblies. Altronix identifies the ULXB Series as suitable for incorporation into selected Trove1, Trove2, and Maximal access and power integration systems when installed according to the approved system configuration. The AL400ULXB2 operates within an ambient temperature range of 32 F to 120 F (0 C to 49 C), with a storage temperature range of -4 F to 158 F (-20 C to 70 C). Its maximum specified relative humidity is approximately 85% +/- 5%. Because the product is a power supply subassembly rather than a complete enclosed unit, installers must provide appropriate mechanical protection, AC wiring separation, grounding, battery accommodations, and access restrictions in accordance with the manufacturer's installation instructions.

The Altronix AL400ULXB2 is UL listed as a power supply subassembly for access control, burglary alarm, fire protective signaling, and hospital signaling or nurse call applications. Manufacturer documentation identifies applicable listings under UL 294 for access control, UL 603 for burglar alarm power supplies, UL 1481 for fire protective signaling power supplies, and UL 1069 for hospital signaling and nurse call equipment, with applicable Canadian signal equipment recognition. The ULXB installation guide also documents ANSI/UL 294 7th Edition performance classifications of Level IV endurance, Level I line security, and Level II standby power for the AL400ULXB2 subassembly. The final equipment installation must use an appropriate listed enclosure and compatible control or distribution equipment to maintain applicable system approvals. Unlike the Altronix AL400ULX, which includes a factory-supplied BC300 metal enclosure, the AL400ULXB2 is supplied as a board-only assembly. Combining selectable 12/24 VDC output, 4A/3A capacity, automatic battery backup, supervised power conditions, and compact UL-listed construction, the AL400ULXB2 provides a reliable foundation for integrated security and life safety power systems. Altronix backs the board with its lifetime limited manufacturer warranty, subject to published terms.