The power supply will warn the user if the internal temperature rises to within 10°C of its shut down point. This warning is often triggered by a building air-conditioning failure, and the user can reduce the system load if the desire is to keep the system functioning. Because the output has a wide adjustment range, both the overvoltage protection and DC Good signal track the output voltage. This greatly reduces the possibility of false signals. HFE power supplies carry the cUL mark for the US and Canada and are certified to EN 60950-1 for use in Europe. The units meet Class B conducted EMI as well as Class A radiated.

