Capacitive load - Circuit protection
The Safe Operating Area curve does not tolerate arcing. 

Using that plot Figure 16, at 150 volts from the plot, less than ONE AMP is allowed.

You may need to insert series current limiting resistance: non-inductive.

Different power transistors have different ability to tolerate pulse-energy overloads. NASA and the automotive manufacturers uncovered this, for oldstyle versus newstyle MOSFETS, about 20 years ago; the oldstyle MOSFETs were much more robust.

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Can we do better? Can we detect the high current, and shut off the input? Yes.







simulate this circuit &ndash; Schematic created using CircuitLab

If you wish to use this circuit, I suggest you simulate it to ensure the pulse (short circuit detection) will propagate thru the 3 transistors quickly (10 or 20 nanoseconds). The 100pF caps may be needed.

To first test at 50 volts and 75 volts and 100 volts and 125 volts, reduce the resistor values of R13,14,15,16 proportionately; thus at 50 volts, make the resistors 1/3 of what I've suggested.