At 06:25 PM 3/31/99 -0500, rich wrote: > Any ideas??? Richard Blair >N99997 - 415D > 4J6 >[EMAIL PROTECTED]
When a circuit carrying DC current to an inductive load is opened,
the
magnetic field of the inductive load will rapidly collapse creating a
high-energy high-voltage spike of the opposite polarity which can burn the
contacts of a switch. Connecting a reverse-polarity diode across the
inductive device will allow the field to collapse in a controlled manner
by
passing current through the diode when the supply circuit is opened and
the
voltage polarity reverses. This eliminates the high voltage spike thereby
increasing the life of the switching device. No current flows through the
diode while the circuit is energized since it is connected backwards
across
the circuit.
Jim Austin
N93543
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