| Relay
Protection
In some applications of high impedance relays for protection
and control duties, the maximum internal fault current
can develop high voltages that can damage the relay
insulation.
A range of METROSIL non-linear resistors, mainly based
on 150mm diameter discs, has been developed to limit
this voltage to a safe level.
Correct METROSIL selection ensures that the best protection
is obtained while maintaining a METROSIL leakage current
low enough to have negligible affect on the accuracy
of the relay at its maximum setting voltage.
Single or three element METROSIL non-linear resistors
are available for use with single or triple pole relays.
The "METROSIL non-linear resistors for Relays"
leaflet covers the majority of high impedance relay
operating conditions. Where the leaflet does not cover
the conditions, other METROSIL non-linear resistors
can be recommended on receipt of the application details.
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