How critical are the voltage sensing thresholds?
How much current can be taken from the 150V supply?
If it's not important, an opto-coupler and potential divider can be used to pull an MCU input high/low when the a fraction of the voltage exceeds the forward voltage of the diode.
A more sophisticated solution is to use the TL431 to sense the exact voltage via a potential divider and switch on the opto-coupler's emitter, when the threshold is exceeded. Note that it has a maximum voltage rating of 36V, so some trickery will be required to enable it to work from 150V, but it's easily doable. If low current operation is desired, then a lower current alternative to the TL431, such as the ATL431 will be required, as the TL431 requires 1mA or so to work properly.