Find uses for this device:

[siliconmike]

I've developed a small device that trips a circuit if its power
consumption goes outside a bound.

There are quite a few machines (for example - pumps) whose power
consumption depends on the input voltage.

Such machines may get damaged in case the external conditions go
berzerk. (example when there is no input to a submersible pump). In
such cases the power input fluctuates. (The current input fluctuates,
but unpredictably in many cases)

My device is initially programmed with 2 graphs:

1: of Maximum Power versus Input-Voltages of the machine it intends to
protect.
2: of Minimum Power versus Input-Voltages of the machine it intends to
protect.

The device interpolates and makes this graph smooth.

When the power consumption of the machine goes out of bounds for a
given input voltage, it trips the machine.

First, does such device exist in the market ? If yes, what is it called
?
What are the other uses one could contemplate for this device?
(It was originally made for pumps)

Thank you
Mike

 

[siliconmike]

Addendum:

In rural India they want the bore-well pumps to work right from 110 VAC
to 300 VAC. But if the bore-well runs out of water, they want to trip
thte pump.

This is where this device is used.

 

[siliconmike]

First, does such device exist in the market ?

Yes.

If yes, what is it called
?

A Fuse.

Yeah right! Fuse doesn't cut power on under-load conditions..