All heat sinks are internal to the unit and cooled by forced air. The ac power input is protected with a fuse, and the unit meets all CE requirements. 50 or 60 Hz makes the Model 4006 compatible with power cords and ac power outlets in virtually all countries. Plastic front bezel and guide-rail inserts. Rubber feet for table-top protection.
All heat sinks are internal and cooled by a forced-air fan.
Cooling air flows from the lower rear intake, through the power supply and modules to exhaust at the top rear. AC Front-panel, green light indicates the AC Power ON condition when illuminated. The TEMP light turns off if power has been shut off by exceeding the heat-sink temperature limit. Overvoltage category II, Pollution degree 2. Input current at 120 V ac is typically 3 A rms for a 120-W dc load.