ABB Relion 650 Series REB650 Technical Manual page 557

Busbar protection
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1MRK 505 288-UEN A
Technical manual
GUID-35F40C3B-B483-40E6-9767-69C1536E3CBC V1 EN
Figure 244:
Inverse curve A characteristic of undervoltage protection
Time inverse characteristics
Section 19
551

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