The Phase Controlled Inrush Switch provides the engineer with the ability to “program” the phase angle of the input power waveform at which power is applied to any DUT. The PCIS allows the user to pre program 0º, 45º, 90º, 135º, 180º, 225º, 270º and 315º. This function is particularly useful when testing the inrush current of a device which is either inductive or capacitive, allowing “worst case” phase angles to be applied to the device under test. The PCIS is only suitable for use with a supply frequency of 50-60Hz. Use with higher frequencies may damage the unit.