Features A-300AB  Input voltage:176～264VAC  -25~+60℃ working temperature(refer to derating curve)  Fan cooling  Protections: Short circuit/Over load  100% full load burn-in test  High efficiency, High reliability Product description A-300AB is 300W Led display power supply. The input voltage rang is 176～264VAC and output voltages are 2.8V、3.3V、3.8V、4.2V、4.5V、5V. It can be applied to Led display、LED indicator light and other Led display fields. This series product is ultra-thin design, with a height of only 31.2mm, and can adapt to a variety of box size requirements. Super high efficiency, compact shell design and good heat dissipation ensure the long-term stable work of this series of products. Product installation and Instructions: 1、When installing, please follow the mechanical size and installation method. 2、Before commissioning, please check and proofread the connections on the terminals to make sure that the input and output, AC and DC, positive and negative poles, voltage and current values are correct, to prevent the occurrence of reverse connection errors and to avoid damage to power supply and user equipment. 3、Please use the multimeter to measure whether the fire line, zero line and ground line are short-circuited and whether the output terminal is short-circuited before power is turned on. 4、Do not exceed the nominal value of the power supply in use, so as to avoid affecting the reliability of the product. If you need to change the output parameters of the power supply, please consult the technical department of our company before using the power supply to ensure the effectiveness and reliability of the use