Square D by Schneider Electric 9013FHG12J55X Air-Compressor Pressure Switch, 150 Psi Set Off, 30 Psi Fixed Differential, 1/4" Npsf Internal, 2-Way Release Valve
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The power supply can be used with either 110 or 220 volts.
A 3 phase component is listed on the data sheet. If used in conjunction with a magnetic starter, it could work on single phase.
As for ports, I'm not quite sure I would use that term for them. There are two terminals (screw type) on the line side and two on the loading side, if my memory serves me correctly.
Selected User Reviews For Square D by Schneider Electric 9013FHG12J55X Air-Compressor Pressure Switch, 150 Psi Set Off, 30 Psi Fixed Differential, 1/4" Npsf Internal, 2-Way Release Valve
A two cylinder, 2 HP, 150 psi compressor from Sears, model number 106, is old and no longer in operation. The switch worked on my compressor, but I suspect it actually has a differential pressure of 27 psi. As the adjustment is made, the set points are shifted about 5 psi per revolution.
We theld the screws a little tighter on the gasket to stop leaks. Again, the leak occurs. They have been tightened up a little. Please allow me to repeat myself. We're seeing leaks. . . . . . I'm going to replace it with something else today.
I've done it all.
This was replaced on my compressor and now it works as it should.