Overview Model AL201UL power supply converts 24VAC/60Hz input, into 12VDC @ 1.75 amp Class 2 Rated power limited supply current output. Agency Listings • UL Listed for Access Control System Units (UL294), UL Listed Standard for Power Supplies for Use with Burglar-Alarm Systems (UL603) File # BP5864. Features/Specifications • 12VDC output. • 1.75 amp of continuous supply current. • Class 2 Rated power limited output. • 24VAC/40V amp. Use UL listed plug-in transformer. • Filtered and electronically regulated outputs. • Short circuit and thermal overload protection. • Built-in charger for sealed lead acid or gel type battery backup. • Maximum charge current .4 amp. • Automatic switch to stand-by battery when AC fails. • Zero voltage drop upon transfer to battery backup. • AC fail supervision (form "C" contact rated @ 1 amp 28VDC). • Low battery supervision (form "C" contact rated @ 1 amp 28VDC). • AC input and DC output LED indicators. • Lifetime Warranty. Enclosure • Accommodates up to two (2) 12VDC/4AH or one (1) 12VDC/7AH batteries. • Dimensions: 8.5”H x 7.5”W x 3.5”D. • 1/2 and 3/4 combination knockouts.