3521/3541/3551/3571 12VDC Power Supplies The 3521, 3541, 3551 and 3571 Series 12VDC regulated power supply units provide the necessary power requirements to all Sargent electromechanical and access control locks. These power supplies feature integral battery charging capability and are recommended when using a Sargent system.BENEFITS UL Class 2 Listed Four models available: 1, 2, 4, or 6 amps Fire alarm interface standard Slide switch controls the power to each circuit Downloads Electroguard Catalog Installation Instructions Request Information Discuss your needs directly; fill out the form below. loading Interested in this product? Contact Us Related products 3287 Door Status Switch Timer Model – TMR9 Release Hold Timer 4291/4292 Keypads