Altronix AL175ULX2 Dual 12/24VDC Power Supply Charger

Altronix AL175ULX2 Access Control Power Supply Charger

Overview

The Altronix AL175ULX2 is a UL-listed switching power supply and battery charger designed for access control systems requiring dual independent power outputs. This unit converts 115VAC 60Hz input into two individually protected Class 2 rated outputs selectable as 12VDC or 24VDC, delivering 1.75A continuous maximum current per supply. The AL175ULX2 supports sealed lead-acid or gel-type battery backup, enabling failover operation upon AC loss with instantaneous battery activation. Ideal for securing fail-safe and fail-secure lock control alongside auxiliary device power in a single, compact enclosure.

Key Features

• Dual Independent Outputs: Two Class 2 rated power-limited outputs with individual PTC auto-resettable protection; one output dedicated to fail-safe/fail-secure lock control (switched), one for auxiliary power (unswitched)
• Selectable Output Voltage: Each output configurable as 12VDC or 24VDC to match device requirements without multiple SKUs
• Continuous Power Delivery: 1.75A maximum continuous output per supply with short-circuit and thermal overload protection
• Battery Backup Capacity: Accommodates up to two 12VDC/12AH sealed lead-acid or gel-type batteries; failover is instantaneous upon AC power loss
• UL and CSFM Approvals: UL294 Access Control listing and CSFM approval for fire alarm applications; meets CSA Standard C22.2 No.205-M1983
• Fire Alarm Integration: Supervised latching or non-latching output with Form "C" contacts for AC failure reporting; supports fail-safe disconnect
• Low Heat Dissipation: 11 BTU/Hr at 12VDC output and 22 BTU/Hr at 24VDC output for reliable operation in compact installations
• Input Monitoring: LED indicator shows input voltage presence and DC output power status
• Compact Enclosure: Mounts in standard BC400 cabinet (15.5" H × 12" W × 4.5" D), designed for integration into security control panels
• Wide Operating Range: Stable operation from 0°C to 49°C; storage rated to –20°C to 70°C with relative humidity 85% ±5%
• Input Protection: Accepts 115VAC 60Hz at 0.6A with no external transformer required
• Lifetime Warranty: Backed by Altronix lifetime product warranty

Integration & Compatibility

The AL175ULX2 integrates directly into access control installations where independent power rails are required. The switched output delivers power to fail-safe or fail-secure electronic locks, while the unswitched auxiliary output powers card readers, request-to-exit sensors, or status indicators. Both outputs are PTC protected, eliminating the need for external fuses and reducing nuisance disconnects during momentary overload conditions. The unit's supervised fire alarm output supports building-wide AC failure notification through latching or non-latching relay logic, complying with life-safety protocols in commercial and institutional deployments.

Battery charging is automatic; when AC is present, sealed lead-acid or gel batteries charge continuously at the supply voltage. Upon AC loss, batteries supply the full 1.75A output until depleted or AC is restored. This architecture is common in door access control, intercoms, and emergency egress systems where power continuity is critical.

Marty Allison

I've deployed the AL175ULX2 in numerous access control retrofits and new builds. This supply covers the bulk of dual-output requirements for card reader and lock control without overcomplicating the electrical design. The PTC protection on each output is genuine protection—not a marketing term—meaning you won't blow a fuse if a lock stalls or a reader shorts. That matters in the field.

Technical Highlights:

• Selectable Voltage: The ability to configure each output as 12VDC or 24VDC independently means you can power mixed-voltage devices from one unit. No need to stock separate models for different voltage ecosystems.
• Battery Integration: The AL175ULX2 charges and backs up two 12AH batteries with instantaneous failover. In a power loss, your locks stay energized immediately—no soft-start lag. Tested and reliable.
• Supervision: Form "C" relay contacts report AC failure to a fire panel or BMS. This is non-negotiable in life-safety applications, and the unit delivers it built-in.

Deployment Considerations:

• Battery runtime depends on load. At full 1.75A continuous draw, two 12AH 12V batteries in parallel give roughly 8 hours of backup. Size your batteries based on lock hold time and occupancy exit requirements.
• Ensure the BC400 enclosure is mounted in a climate-controlled area. The 0°C to 49°C operating range excludes unheated garages or outdoor cabinets; use thermal management if needed.
• The switched and unswitched outputs allow you to prioritize lock power during battery backup. Use the switched output for the lock (it cuts power on AC loss); use the unswitched auxiliary for continuous-draw devices like readers that need to function during battery mode.

The AL175ULX2 is a workhorse. It's UL294 listed for access control, CSFM approved, and built with redundant output protection. If you're specifying dual-output 12/24V power for access control, this unit checks every box and leaves nothing to chance.