Lots of stationary equipment in construction has them. Screw compressors, large generators, vibratory hammer power packs, and so on. Most of this equipment get turned on in the morning and runs wide open all day by itself with nobody watching it, if it was to develop an oil leak no one would see it until the engine locked up. Murphy switch is cheep protection on very expensive equipment.
The last one I had on site was on a HPSI power pack with a 3412 V12 caterpillar that powered one of the largest vibratory hammers on the market, the power pack itself is around $200,000.