Vintage Penn Controls industrial high pressure control switch.

Vintage Penn Controls industrial high pressure control switch. It is marked as model P72CL and according to the wiring schematic, can be used to control single phase (regular household) or polyphase (industrial) motors. It is marked for 2 to 5 horse power motors. This switch is calibrated for a pressure range of 50 to 240 pounds / square inch (psi).

This is from the estate of an industrial engineer and looks in excellent condition.