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A varistor is used as the protective circuit for overcurrent.
Though varistors normally do not allow current to pass, they turn the CML
relay
ON when a high-voltage CI arrives from the telephone line, and so
the current is allowed to escape to the line to protect the circuit elements
from voltage rise.
ON
L1
CML relay
ON
L2
Fig. 6-15 Overcurrent Protection (varistor)
FACSIMILE SYSTEM
S relay
DC seize
P relay
circuit
Varistor
1
2
3
4
5
6
ït
çi
6–13
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