RF: 285%210mm LINO-T DC Power Supplies User Manual 1. Introduction UTP3313TFL-IFUTP3315TFL-Il linear DC power supplies are high-guilty and stable devices. These power supplies output pure and reliable signals. Other features include 4-digit voltage and current LED display, short-circuit protection, overload protection, reverse polarity protection and more. These power supplies are ideal tools for university and technical trade schools, electronics production lines, household appliance repair companies, afc.