/
/
/
1
3(
0
a
$
<<<
/
$
8*
$:
Figure 9-3 Monitoring for ground fault/insulation fault in the case of an ungrounded 4-wire IT AC system
Note
The maximum cable length of the control cables is 50 m or 100 pF/m.
9.3.6 Characteristics
Characteristic curves of the 3UG4581 insulation monitoring relays
The characteristics below show the load limit curves of the 3UG4581 insulation monitoring
relays.
,$
9
8
Figure 9-4 AC load (resistive)
3UG458. insulation monitoring relay.
9.3 3UG4581 insulation monitoring relay
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 167
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