What can happen at overvoltage or reverse polarity?

If a voltage higher than the maximum admissible input voltage is applied to an electronic load a short-circuit may be caused which may lead to undefined current flow, arcs and even fire. The same can happen if the unit under test is applied in reverse polarity. Therefore we strongly recommend to connect an external fuse between Input+ of the electronic load and the DUT! Dimensioning the fuse depends on the demands of the DUT.