Where are all the controls on most circuits?

A control circuit is a special type of circuit used to control the operation of a completely separate power circuit. Consider a 1,000 horsepower, large industrial motor driving a water pump. The motor is connected to a high voltage electrical supply of 2,400 volts. When switches are wired in series with a load; If any switch opens, then the circuit will be open and the load de-energized. This is important, especially with safety controls.

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