Which supply voltages are available for inductive proximity sensors?
This depends upon the type you need for your application. For example, sensors are available in AC, DC and AC/DC. Most brands tend to have their own preferred supply voltage ranges. Some typical ranges could be 10-30VDC, 12-36VDC, 12-48VDC, 20-300VDC 20-253VAC or 20-264VAC/DC, to name a few.