ABB RELION 670 Series Technical Manual page 1314

Section 22
IED hardware
IEC1MRK002801-AA11-UTAN-RAM V2 EN-US
IEC1MRK002802-AA-13 V1 EN-US
Figure 657: Binary in/out module (IOM), input contacts named XA corresponds to rear
The binary input/output module version with MOV protected contacts can for example be used in
applications where breaking high inductive load would cause excessive wear of the contacts.
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position X31, X41, and so on, and output contacts named XB to rear position X32,
X42, and so on
The test voltage across open contact is lower for this version of the binary input/
output module.
1MRK 502 066-UUS B
SEMOD175370-4 v1
Technical manual