Section 5
1MAC308145-MB E
Relay physical connections
78
RER620
Application Manual
Table 20:
Output contacts X110-14…24
5.2.3
IRF
The IRF contact functions as an output contact for the self-supervision system of the
protection relay. Under normal operation conditions, the relay is energized and the contact
is closed (X100/3-5). When a fault is detected by the self-supervision system or the
auxiliary voltage is disconnected, the output contact drops off and the contact closes
(X100/3-4)
Table 21:
IRF contact
Terminal
Description
X110-14
SO1, common
X110-15
SO1, NO
X110-16
SO1, NC
X110-17
SO2, common
X110-18
SO2, NO
X110-19
SO2, NC
X110-20
SO3, common
X110-21
SO3, NO
X110-22
SO3, NC
X110-23
SO4, common
X110-24
SO4, NO
Terminal
Description
X100-3
IRF, common
X100-4
Closed; IRF or Vaux disconnected
X100-5
Closed; no IRF, and Vaux connected
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