A power switch comprising: a cascode having a normally ON transistor connected in series with a normally OFF transistor at a cascode node; a first diode connected between a gate of the normally ON transistor and a first ground common to the cascode and the diode; and a controller comprising: a gate driver having a gate driver output connected to the gate of the normally ON transistor; a controller power supply having positive and negative outputs that provide positive and negative rail voltages respectively to the gate driver and wherein the positive output of the controller power supply is connected to the cascode node and the negative output the controller power supply to a second ground that is floating relative to the first ground; and a DC isolator having positive and negative isolator inputs connected respectively to the positive and negative outputs of the power supply and a first isolator output connected to the gate of the normally OFF transistor and a second isolator output connected to the first ground, and wherein when the controller power supply is turned ON, the DC isolator generates a DC voltage at the first voltage output that turns and maintains ON the normally OFF transistor. a cascode having a normally ON transistor connected in series with a normally OFF transistor at a cascode node; a first diode connected between a gate of the normally ON transistor and a first ground common to the cascode and the diode; and a controller comprising: a gate driver having a gate driver output connected to the gate of the normally ON transistor; a controller power supply having positive and negative outputs that provide positive and negative rail voltages respectively to the gate driver and wherein the positive output of the controller power supply is connected to the cascode node and the negative output the controller power supply to a second ground that is floating relative to the first ground; and a DC isolator having positive and negative isolator inputs connected respectively to the positive and negative outputs of the power supply and a first isolator output connected to the gate of the normally OFF transistor and a second isolator output connected to the first ground, and wherein when the controller power supply is turned ON, the DC isolator generates a DC voltage at the first voltage output that turns and maintains ON the normally OFF transistor. a gate driver having a gate driver output connected to the gate of the normally ON transistor; a controller power supply having positive and negative outputs that provide positive and negative rail voltages respectively to the gate driver and wherein the positive output of the controller power supply is connected to the cascode node and the negative output the controller power supply to a second ground that is floating relative to the first ground; and a DC isolator having positive and negative isolator inputs connected respectively to the positive and negative outputs of the power supply and a first isolator output connected to the gate of the normally OFF transistor and a second isolator output connected to the first ground, and wherein when the controller power supply is turned ON, the DC isolator generates a DC voltage at the first voltage output that turns and maintains ON the normally OFF transistor.