The HFE series has active power factor correction to EN 61000-3-2, and has less than 0.75mA earth leakage current. A 11.2V to 12.5V, 0.5A auxiliary supply can be used to drive signaling and programming features. Cooling is provided by two internal temperature controlled fans for longer field life. In addition to having many signals and controls, the HFE is available with an optional PMBus interface, based on I²C.

