The 286566-01 is an Overspeed Detection Module manufactured and designed by Bently Nevada as a part of 3500/54M Series used in overspeed detection applications.
The 125840-01 is a High Voltage AC Power Input Module manufactured and designed by Bently Nevada as a part of 3500/15 Series used in Machinery Protection System.
The IPC 704 signal conditioner is normally mounted in an ABA... type industrial polyester enclosure for environmental protection against dust, oil and water jets.