Report copyright - SPAF 140 C Frequency Relay - My Protection Guide...4 Connections IRF SS1 TS1 SS2 TS2 SS3 TS3 SS4 TS4 I/O BS1 BS2 BS3 BS4 BS5 U1 4 f 4 df/dt 48 47 46 45 23 22 11 10 BS4 BS3 BS2 BS1
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