Re: Cuisinart coffe make part identity help

On Jan 30, 7:14 am, stoke...@xxxxxxx wrote:


Thanks for the info Franc. What I still don't understand is why it is
configured so that the coffee maker would still work with this
component blown. I guess it did protect the rest of the circuit, even
though two traces were blown off

MOVs (Metal Oxide Varistors - basically a voltage-variable resistor)
are intended to protect against overvoltage. As the voltage across
them exceeds the breakdown voltage rating of the device, it switches
over into conduction, basically close to a short circuit. You will
sometimes see a fuse in series with the power lead - when the MOV
goes into conduction, the fuse will blow, protecting the rest of the
circuitry from the overvoltage. If there's nothing but the MOV across
the mains, as soon as it self-destructs from overcurrent, there's
nothing left to protect the downstream components.

Feel free to correct me if I have any of this wrong. I have been
practicing the software dark arts for the last 20 years - far removed
from my EE days.


Jerry
.

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