Technology partner: V474 Altronix Corporation
SKU AL175ULB-474
AL175ULB is a power-limited power supply/charger that converts a 24VAC input into two (2) individual PTC protected 12VDC or 24VDC outputs (see specifications). It is intended for use in applications requiring UL Listing for Access Control (UL294) and applications requiring an interface with Fire Alarm Control Panels.


  • 1.75 amp of continuous supply current.
  • 12VDC or 24VDC selectable output.
  • 24VAC, 40VA for 12VDC or 24VDC output.
  • AC fail supervision (form ''C'' contact rated @ 1 amp 28VDC).
  • AC input and DC output LED indicators.
  • Automatic switch to stand-by battery when AC fails.
  • Built-in charger for sealed lead acid or gel type battery backup.
  • Dry Trigger Input.
  • Dry trigger output supervision (form ''C'' contact rated @ 1 amp 28VDC).
  • Filtered and electronically regulated outputs.
  • Fire Alarm Panel or Access Control System trigger inputs.
  • Lifetime Warranty.
  • Maximum charge current .4 amp.
  • One (1) triggerable and one (1) constant Class 2 Rated power limited outputs.
  • Short circuit and thermal overload protection.
  • Transformer requirements:
  • UL Recognized Component for Access Control Systems (UL294).