T O S H I B A
PR
E C A U T I O N S I N
A
PP
L I C A T I O N S
When planning to use Toshiba Static 2E Relays, be sure
to give full consideration to the following precautions:
(Control power source supply
The power circuit must be arranged so that control
is always supplied to the 2E Relay before the
main circuit is switched ON.
(2) Limit the secondary burden when combining with
external
When the relay is used in a medium
or high voltage circuit,
an excessive CT secondary
burden may cause secondary current waveform
distortion.
large waveform distortion may be detected as
unbalanced current, limit the external
secondary
burden according to the overcurrent constant while
referring to Table 3.
Table 3
Limit of external CT secondary burden
Recommended Secondary Burden
Not greater than 50% of rating
Not greater than 85% of rating
or above
Up to rated burden
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