This relay detects any leakage on either three phase or single phase output and it
immediately trips the circuit breaker where that leakage occurs.
The current sensitivity of this relay is 30 mA.
Improper handling of the relay may lead to unsafe condition in comparison with that does
not use the relay.
To ensure further safety, install a leakage relay for each load at the position near the load.
(3) Grounding
Ground as following to operate the earth leakage relay certainly.
Ш Grounding of the machine
Ground the grounding terminal for earth
leakage relay and case grounding terminal
according to the below.
Ф Grounding of the grounding terminal for
earth leakage relay
If grounding described below does not
comply with the local rule, stricter of the
two shall apply.
Use the grounding wire which sectional
area is 5.5mm 2 or larger.
Usually it is possible that using attached
grounding rod. But if grounding resistance
is over 100
Q ,
provide the grounding rod
which surface area contacted the ground is large.
Ф
Grounding of the case grounding of the machine
Grounding the case grounding of the machine
is refer to U - 3 (1) Case grounding of the
machine j .
grounding terminal
for earth
leakage
relay
■ Grounding of the load equipment
As in the case of the machine, execute grounding work on the load equipment case.
Provide the grounding rod to satisfy the grounding resistance which conforms to the local
rule.
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