ABB REF611 - IRF

Terminal Description
X130:14 SO2, NO
X130:15 SO2, NC
X130:16 SO3, common
X130:17 SO3, NO
X130:18 SO3, NC
5.2.3 IRF
The IRF contact functions as an output contact for the self-supervision system of the
protection relay. Under normal operating conditions, the protection 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 39: IRF contact
Terminal Description
X100:3 IRF, common
X100:4 Closed; IRF, or U
aux
disconnected
X100:5 Closed; no IRF, and U
aux
connected
1MRS757456 D Section 5
Protection relay's physical connections
REF611 177
Application Manual