The HLN-40H-30B is a high-efficiency, open-frame power supply from Mean Well. It is a constant-voltage, single-output switching power supply, rated at 40W and is approved by UL, CUL, and TUV. This power supply is suitable for applications that require low cost, non-isolated power. It features a wide input voltage range with full range AC input from 85 to 264 volts and active PFC functions. The HLN-40H-30B offers a tightly regulated output voltage of 30 volts with ±8% line regulation and ±4% load regulation. It also offers protection functions of short circuit, overload, and over-voltage. This power supply is also compliant with EMC standards and high-efficiency up to 87%.