Green LED indicators turn red when the supply voltage is reduced by an overload. The LEDs extinguish if the voltage is reduced to zero by a low-impedance short circuit. Thermal cut-out switches protect the power supply against excessive temperature. When the heat sink temperature is within 15 C of the maximum safe temperature, the red TEMP warning indicator turns on. When the maximum safe temperature is exceeded, all power to the unit is automatically turned off.
Power is recovered automatically when the temperature is reduced below the safe limit.
There are no hot, external heat sinks that can be accidentally touched. 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.