The Mean Well MDR-100-24 is a high efficiency AC/DC switching power supply. It is rated 100W, 24V and has a 4.2A output. It is fully enclosed and compact in size with a built in active PFC function. This device has a wide range input of 85-264Vac and has a high efficiency of up to 91%. It is equipped with short circuit current limiting, overload protection, and over voltage protection. The MDR-100-24 also has constant current limiting, auto restart, and fan speed control functions. This device is suitable for a variety of applications including industrial control systems, communications equipment, instrumentation, and electrical appliances.